SmartASS-3 Air Speed Speaker Installation and User Manual
Contents
1. failure through the audio interface The failure is reported as DING Fail number where numberis the error code for the particular test that has failed However if the voice data cannot be accessed the failure message can t be played and so instead the error is signalled by bursts of random noise In either case please switch off the SmartASS 3 and contact Smart Avionics to resolve the problem Sounds a bit like the radio when a very weak transmission is received 16 www smartavionics com Appendix A Hacking the SmartASS 3 Note You don t have to read this Appendix to install and use the standard SmartASS 3 It s here to give some guidance to people who want to modify the SmartASS 3 s behaviour The SmartASS 3 program is written in the Lua scripting language see www lua org Lua is a widely used interpreted language that has been around for more than 20 years The implementation used here is the eLua embedded Lua system see www eluaproject net Appendix B shows the eLua license The SmartASS 3 source code is freely available as a git repository and can be found at https bitbucket org smartavionics elua smartass The SmartASS 3 specific files all reside in the smartass master branch and associated development branch snartass dev These branches are based on the master branch which is synced with the upstream eLua repository You can access the eLua console by connecting the SmartASS 3 USB socket to a PC2. is released under a BSD license The rest of the eLua code is licensed under MIT listed below The MIT License Copyright c 2007 2008 2009 2010 Dado Sutter and Bogdan Marinescu www smartavionics com 19 Permission is hereby granted free of charge to any person obtaining a copy of this software and associated documentation files the Software to deal in the Software without restriction including without limitation the rights to use copy modify merge publish distribute sublicense and or sell copies of the Software and to permit persons to whom the Software is furnished to do so subject to the following conditions The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software THE SOFTWARE IS PROVIDED AS IS WITHOUT WARRANTY OF ANY KIND EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM DAMAGES OR OTHER LIABILITY WHETHER IN AN ACTION OF CONTRACT TORT OR OTHERWISE ARISING FROM OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE 20 www smartavionics com Index A accelerometer orientation 14 airspeed capturing 14 repeat rate 14 alert 9 general 6 undercarriage 6 C CAN bus 9 capturing airspeed 14 check wheels dow
3. 1 Dado Sutter and Bogdan Marinescu eLua is Open Source and is freely distributed under the MIT licence The Lua part of eLua is licensed under the Lua licensing terms which you can find at http www lua org license html The XMODEM code is adapted from the FreeBSD at91 library which was written by M Warner Losh and is released under the BSD license The pack module is adapted from the Ipack module by Luiz Henrique de Figueiredo and it s placed in the public domain The bit module is adapted from the bitlib library by Reuben Thomas distributed under a MIT license The integer only lua is based on the Go Long Lua patch by John D Ramsdell from the Lua Power Patches page and is placed in the public domain The multiple memory allocator dlmalloc is written by Doug Lea and is placed on the public domain The TCP IP stack is adapted from ulP written by Adam Dunkels and released under a BSD license The FAT file sistem is based on FatFs written by Elm Chan http elm chan org A copy of the FatFs license can be found in the LICENSE fatfs file The RPC implementation is based on Russell Smith s Lua RPC http q12 org lua index html A copy of the Lua RPC license can be found in the LICENSE luarpc file Manufacturer provided CPU support libraries are licensed under their own terms check src platform platform name for details linenoise https github com antirez linenoise eLua s readline replacement
4. 8V Reverse polarity protected Supply Current 100 mA Audio Output 3V Peak With 200 Ohm load Voltage Minimum Load 50 Ohms Impedance Electrical 10 Way plug socket Screw terminals Connector Air Connectors Hose barbs Requires 4mm ID tubing Enclosure 140 x 86 x 30 mm Includes mounting tabs Dimensions Total Weight 230 grams 1 4 Installing software updates Software updates are installed simply by copying the updated file s into the top level root directory of the SD card This can be done on any system Linux Mac Windows etc that supports SD card storage either directly or via a USB adapter Please ensure the power is off before ejecting or inserting the SD card and that the card is fully home before applying power again www smartavionics com Chapter 2 Installing the SmartASS 3 Installation of the SmartASS 3 consists of the following steps 1 Setting the configuration switches if necessary 2 Mounting the enclosure within the instrument panel 3 Mounting the control knob on the instrument panel 4 Connecting the pitot and static connections 5 Connecting the power supply and audio output wires and optionally the undercarriage and general alert wires 6 Carry out a one time initialisation procedure that orientates the accelerometer described in Section 3 2 2 2 2 1 Setting the configuration switches If you wish to change the speed units from the default setting of Knot
5. ITOT O MICRO sp 10WAYCONNECTOR USB CARD STATIC O Fig 1 1 SmartASS 3 Enclosure Panel The SmartASS 3 s electrical connections are via a removable 10 way screw terminal connector A micro SD memory card holds the audio files and some other configuration data A combined volume control push switch Fig 1 3 that selects the mode of operation is mounted in any suitable location such that it can be easily accessed while flying The micro USB socket is used by Smart Avionics when the unit is being tested and calibrated 2 www smartavionics com Overview of installation Fig 1 2 Enclosure Fig 1 3 Control Knob SmartASS 3 Turn Knob To Adjust Volume Push Knob To Change Mode Fig 1 4 Control Knob Label www smartavionics com Specifications 1 3 Specifications All temperature specifications refer to the temperature of the SmartASS 3 enclosure not the outside air temperature Table 1 1 Specifications Operating Temperature Range 25 C 85 C Minimum Speed 25 Knots 30 MPH 50 KPH Silent below this speed Maximum Speed 250 Knots 287 MPH 462 KPH Not an absolute limit Absolute Accuracy linearity amp offset 12 In the temperature range 0 C 85 C Assumes unit has been recently zeroed Repeatability 0 1 At 25 C For speeds pressure between 25 and 250 hysteresis Knots Supply Voltage 6 1
6. SmartASS 3 Air Speed Speaker Installation and User Manual Smart Avionics Ltd SmartASS 3 PITOT O O STATIC WWW SMARTAVIONICS COM Revision 1 www smartavionics com 24 07 2014 SmartASS 3 Air Speed Speaker Installation and User Manual Copyright 2006 2014 Smart Avionics Ltd Table of Contents A A ee 1 TTS ANTIV SPEAK speed us dp 1 1 2 Overview of installation oooooonncnnnincnnnncoooncocnocnoncnonncornnononnono nono 2 ABs Specilicatio iS elena 4 1 4 Installing software updates non nnnnnons 4 2 Installing the Smart ASS 3 ailcar ein 5 2 1 Setting the configuration switches 5 2 1 1 Configuring the speed units 6 2 1 2 Configuring the undercarriage alert 6 2 1 3 Configuring the general alert c ceccccecseeeeeeeeeeeeseeneeeeees 6 2 1 4 Firmware upgrade switch ma 7 2 2 Mounting the efiglosure ai 7 2 3 Mounting the control Kobe mimi 7 2 4 Pitot and static connections im iiii wam 7 2 5 Electrical connections viu 8 2 5 1 Audio CONNECTIONS si o ii 8 2 5 2 Alert COMES lla 9 2 5 3 CAN bus COnnectionS Sica mzawa 9 2 6 Installation approval i 9 3 sige SINALTA SS nia 11 3 1 The operating Modest edili lai 11 SAL Talking AS ME raise 11 3 1 2 Speed director Mode i 11 Se MOE nn ia 12 3 2
7. SmartASS 3 will not select speed director mode 3 2 1 3 Capturing the target airspeed Pressing the push switch for more than 1 2 second captures the current airspeed and switches to speed director mode if that mode is not already active An audio beep sounds after the switch has been pressed for enough time to capture the airspeed The new target airspeed will be announced as Target speed is and will be stored until another speed is captured The target airspeed is remembered when the power is off 3 2 2 Push switch secondary functions The push switch also has these secondary functions 3 2 2 1 Selecting the airspeed repeat rate By default the airspeed is repeated every 6 seconds in talking ASI mode This period can be altered by pressing and holding the push switch until two beeps are heard This will cycle the airspeed repeat period between the values of 3 6 and 12 seconds When the switch is released you should hear the message Repeat period is The selected value is remembered when the power is off 3 2 2 2 Orientating the accelerometer Once the SmartASS 3 has been installed the unit must be orientated so that it knows which way is up With the aircraft positioned in the flying attitude press and hold the push switch until three beeps are heard When the switch is released you should hear the message Orientation set The orientation is remembered when the power is off and this operation
8. THE COMO SA ad ae 12 3 2 1 Push switch primary functions eeeeee eee eeteeeeeees 13 3 2 2 Push switch secondary functions 14 3 2 3 PUSHSWIteH SUMMani silla 15 3 3 Zerolngithe SManASS 3 ds 15 34 Salt POST AMONG allenarlo 16 A Hacking the SmartASS 3 sr ei ere 17 A SMmar Ass 3 Lua files ia ida 17 A 2 Building and flashing eLua oooooonncncnnnccioniocnocncocnonnconnconcnancnnnonno 18 B eLua Open Source License naci 19 nn WAA AA AA UE 21 www smartavionics com ill www smartavionics com List of Figures 1 1 SmartASS 3 Enclosure Panel T2 EWG IOS US Ses a WS GORE GOD annn a na ua ka 14 Control Knob Label ia e tek 2 1 Configuration Switches www smartavionics com vi www smartavionics com List of Tables lA SpeciicatOn Sabado bb 4 2 1 Electrical connections cnc cnn nn nnnccnnnnninnns 8 3 1 Push switch functions niwa 15 www smartavionics com vil vili www smartavionics com Chapter 1 Introduction This manual describes how to install and use the Smart Avionics Air Speed Speaker Mk3 hereafter referred to as the SmartASS 3 Please read it before installing and using the SmartASS 3 If you have any questions please send emailto support smartavionics com 1 1 Why speak speed The SmartASS 3 has been developed to provide the pilot of a homebuilt experimental aircraft with
9. a means of accurately determining their airspeed without having to look at the airspeed indicator It does this by speaking the speed in either Knots MPH or KPH through the intercom radio system and hence into the pilot s headset It can be used during any phase of flight but it has been specifically developed for use during the approach phase when both airspeed and flight path need to be accurately controlled During the approach to a short field or ifthe conditions are challenging both speed and flight path are critical The SmartASS 3 is helpful because 1 It reduces the amount of time the pilot has to be looking inside the cockpit so more attention can be paid to getting the flight path right 2 It supplies the pilot with airspeed information in a form that is easier to assimilate than by looking at an ASI 3 lt can warn the pilot when the speed has deviated significantly from a nominated target speed This last capability referred to as speed director mode really sets the SmartASS 3 apart from a conventional ASI In speed director mode instead of simply reporting the current airspeed the SmartASS 3 will actively monitor the airspeed compare it to the target airspeed and then report deviations from the target speed The more the airspeed deviates from the target speed the more the SmartASS 3 will talk Using the SmartASS 3 once the aircraft has been configured for final approach and the checks have been carri
10. all when the unit is turned on this auto zeroing will not occur and you will hear DING airspeed not zeroed It is possible to manually zero the SmartASS 3 at any time There are two ways of achieving this 1 Apply power to the unit while already pressing the push switch When the voice says Airspeed zeroed release the push switch Due to the fact that airspeed is proportional to the square root of the dynamic pressure the effect of a small offset error in the pressure measurement is only really significant at very low airspeeds It s still worth removing the error to get the best possible result www smartavionics com 15 Self Test Failure 2 With the SmartASS 3 already turned on press and hold the push switch until you have heard the 4th beep and then release the switch The SmartASS 3 will then say Airspeed zeroed a Important To ensure that the reported speed is accurate do not manually zero the SmartASS 3 if any of the following are true The aircraft is moving at more than walking pace The wind is blowing into the pitot and it is more than a very gentle breeze The pitot cover is in position The temperature of the SmartASS 3 unit is below 0 C or above 40 C 3 4 Self Test Failure When the SmartASS 3 is turned on it carries out a sequence of tests to check that it is functioning correctly If any of the tests fail the SmartASS 3 goes into a loop continuously reporting the
11. an be silenced by pressing the push switch briefly 3 2 1 2 Selecting the operating mode Pressing the push switch briefly toggles the mode of operation between talking ASI mode and either speed director or sleep modes When in talking ASI mode if the airspeed is no more than 125 of the target speed pressing the push switch briefly will change to speed director mode Otherwise sleep mode is entered Irrespective of the current airspeed pressing the push switch briefly twice in quick succession will always enter sleep mode Pressing the push switch briefly when in either speed director or sleep modes will change to talking ASI mode The mode change is announced as follows Talking ASI mode is selected The SmartASS 3 says Airspeed and then starts to speak the airspeed Or MPH or KPH depending on the units selected during installation When you press the push switch briefly you don t hear any audio feedback no beep www smartavionics com 13 Push switch secondary functions Speed director mode is selected The SmartASS 3 announces the previously captured target airspeed by saying Target speed is Listen to the number it says and confirm that is the speed you want If the number it says is not what you want you will need to capture a new airspeed as described below Sleep mode is selected The SmartASS 3 says Goodbye andthen goes silent f Note Until an airspeed has been captured the
12. and running a terminal emulator program On Linux systems or similar screen dev ttyACMO 115200 will connect you to the console and you can see debug output For Windows systems various terminal emulator programs exist PuTTY is freely available and works OK A 1 SmartASS 3 Lua files The smartass directory contains these Lua script files ad7798 lua Driver for the AD7798 ADC used to measure the pitot pressure autorun lua Startup script that is run when the device is powered up It loads the smartass module and starts executing it lis3dh lua Driver for the LIS3DH accelerometer smartass lua The smartass module this is where it all happens wav lua A very simple module for playing WAV audio files This only copes with uncompressed 8 or 16 bit PCM data You do not need to build and flash eLua when just these script files are modified So if you change them simply copy the changed files into the root directory of the SmartASS s SD card and they will be used instead of the original files If you subsequently remove your files from the SD card the originals will be used again Take care not to remove any of the other files on the SD card www smartavionics com 17 Building and flashing eLua A 2 Building and flashing eLua Note SmartASS 3 development is done using Linux host computers However it should be possible to build and flash eLua using non Linux hosts as all of the tools used are available for other syste
13. ed out the pilot can concentrate on eyeballing the approach and no longer has to look at the ASI to check the airspeed every few seconds The SmartASS 3 also features A 3 axis accelerometer for measuring the acceleration in the vertical direction so that the wing loading can be determined by taking the wing www smartavionics com 1 Overview of installation loading into account the speed director becomes a stall margin preserver i e it assists the pilot in maintaining a safe speed margin above the stall An optional audible undercarriage alert that will be triggered when the speed reduces to the approach speed but the undercarriage is not down and locked An optional audible general alert that can be triggered by any external system A Important Although the SmartASS 3 is accurate and reliable it is intended that it is used in conjunction with the existing ASI instrument s rather than replacing them A Important The SmartASS 3 is not a stall warning system and it does not provide a stall warning function 1 2 Overview of installation Chapter 2 covers the installation of the SmartASS 3 in detail here we just give an overview The SmartASS 3 electronics are contained in a lightweight aluminium enclosure Fig 1 2 that may be mounted in any convenient position and orientation The enclosure is equipped with two barbed air connectors for plumbing the unit into the aircraft s pitot and static lines O P
14. ert is triggered 3 2 The controls The SmartASS 3 has been designed to be very easy to use A combined volume control and push switch is all that is required 12 www smartavionics com Push switch primary functions The volume control works in the conventional manner turning the volume control clockwise increases the volume of the speech Turning the volume control anti clockwise reduces the volume 2 When power is applied to the SmartASS 3 it says Airspeed in Knots and then if the unit auto zeroes itself it will say Airspeed zeroed Section 3 3 has more information about zeroing If the unit has not yet been orientated it will also say G disabled Section 3 2 2 2 describes how the unit is orientated A Important If when the SmartASS 3 is switched on the airspeed is at least 25 Knots 30 MPH 50 KPH the voice will say Compare to ASI after the speed is first reported This is to remind the pilot to check that the spoken speed is consistent with the speed indicated on the ASI If the speeds tally the SmartASS 3 can be considered trustworthy If there is a significant difference between the spoken speed and the speed shown on the ASI the SmartASS should not be used until the discrepancy has been investigated 3 2 1 Push switch primary functions The push switch has three primary functions 3 2 1 1 Silencing an alert message If either of the undercarriage or general alerts sound they c
15. is above 125 of the target speed the SmartASS 3 reverts to talking ASI mode Speed director mode is entered automatically when the speed falls to within 5 of the target speed In speed director mode the volume of the voice will automatically reduce the longer you stay within a given speed band So if the air is smooth and you are flying accurately the Speed good messages will become quieter and quieter as you progress towards the runway threshold If the speed strays into another speed band the volume immediately increases back to the original level y Tip Always trim the aircraft accurately for the chosen approach speed Try notto chase the airspeed especially when the air is rough Aim to smoothly increase or decrease the speed to keep the speed good The airspeed cannot change instantly it takes a few moments for a change in attitude or power to have an effect on the airspeed and a bit longer for the SmartASS 3 and your mechanical ASI to measure that speed 3 1 3 Sleep mode In this mode the SmartASS 3 doesn t say anything at all It doesn t even snore Sleep mode continues until The pilot briefly presses the push switch to enable talking ASI mode Typically this could occur downwind in the circuit as the pilot prepares for the approach and landing The airspeed reduces to within 5 of the target speed and the SmartASS 3 automatically wakes up in speed director mode The general al
16. l to ground will trigger the general audible alert When the general alert is activated you will hear DING Alert Pressing the push switch briefly will silence the alert Remember to enable this feature by setting the appropriate configuration switch as described on Section 2 1 3 2 5 3 CAN bus connections The SmartASS 3 transmits airspeed and acceleration vertical G data on the CAN bus terminals 2 and 3 The data rate is 250K bits S and the messages are in CAN Aerospace format Please contact Smart Avionics for more details if you wish to make use of this data 2 6 Installation approval Before the aircraft can be flown with the SmartASS 3 installed the installation has to be approved Exactly how this is achieved differs from country to country www smartavionics com 9 Installation approval In the UK the installation must be inspected and approved by your LAA inspector and an entry made in the airframe log book The LAA will need to be informed that the SmartASS 3 has been fitted www smartavionics com Chapter 3 Using the SmartASS 3 3 1 The operating modes 3 1 1 3 1 2 The SmartASS has three modes of operation talking ASI speed director and sleep Talking ASI mode This mode simply speaks the current airspeed every few seconds The repeat period can be 3 6 or 12 seconds Also ifthe speed changes very rapidly the new speed is spoken straight away When the
17. lation is completed carry out a leak test on the pitot and static lines to ensure that no leaks have been introduced www smartavionics com 7 Electrical connections 2 5 Electrical connections All the electrical connections are made through the 10 way connector Make sure that the wires are securely held in the connector terminals Use cable ties or lacing cord to bundle the wires near the connector This will reduce the chance of the wires coming loose inthe connector or fracturing due to flexing Table 2 1 Electrical connections Terminal Name Connection 1 GND Radio intercom ground 2 CANL CAN bus low 3 CANH CAN bus high 4 GND Control knob either connection 5 PANEL Control knob either connection 6 UC Switch to ground when U C down and locked 7 10 1 Input Output 1 switch to ground to signal general alert 8 10 2 Input Output 2 9 AUDIO Audio output to radio intercom input 10 12V Fused 12V supply 2 5 1 Audio connections For audio output these wires need to be connected GND terminal 1 GND amp PANEL 4 amp 5 AUDIO terminal 9 12V terminal 10 This is connected to the main ground bus bar or a ground associated with the radio or intercom These connections are to the two wires from the control knob This is connected to an auxiliary or music input of the aircraft s existing radio intercom audio panel installation Exactly where thi
18. ms To rebuild the underlying eLua system you need to install an ARM cross compilation system that provides arm none eabi gcc and its companions You can obtain these from https launchpad net gcc arm embedded A Makefile is provided that defines targets to build the eLua system and flash download it to the board The board supports two methods of flashing SWD DFU Using a SWD adapter such as a STLINK V2 attached to PL3 utilities such as openocd can be used to flash and debug the program The PL3 connections are 1 3V3 pin 1 is nearest to the SD card 2 SWCLK 3 GND 4 SWDIO While flashing the program you can either power the board via the 10 way connector or through the USB connector by connecting a USB cable to a PC or a USB power adapter This method of programming is a little faster than the DFU method and also gives you the ability to debug the C code using gdb Utilities such as dfu util can flash the program via the USB cable To do this the switch PL4 needs to be in the on position before power is applied to the board The USB cable will power the board while it is being flashed so you don t need the 10 way connector plugged in Remember to move PL4 back to the off position after the download has finished The advantage of this method is that you only need a USB cable and no programming adapter www smartavionics com Appendix B eLua Open Source License Copyright c 2007 2008 2009 2010 201
19. n 9 configuring general alert 6 speed units 6 undercarriage alert 6 connections electrical 8 pitot and static 7 control knob mounting 7 E electrical connections 8 enclosure mounting 7 F Fail message 16 firmware upgrade switch 7 G G disabled 13 general alert wiring 9 installation approval 9 K Knots 6 KPH 6 M modes of operation 11 MPH 6 mute audio input 9 O operating modes 11 orientation 14 P pitot connection 7 push switch 12 13 S SD card 2 self test failure 16 software updates installing 4 specifications 4 speed director mode 1 11 static connection 7 static electricity warning 5 switch configuration 5 I talking ASI mode 11 U undercarriage warning wiring 9 V volume control 12 Z zeroing 15 www smartavionics com 21 22 www smartavionics com
20. n Knots If desired the airspeed can be reported in either MPH or KPH by closing the appropriate switch Slide the switch to the on position to select the required speed unit Configuring the undercarriage alert If you want to use the undercarriage alert feature move the UCA switch to the on position If you have a retractable undercarriage you can enable this alert even if you don t have a switch that signals when the undercarriage is down and locked In that case whenever speed director mode is entered the undercarriage alert will be triggered to remind you to check that the wheels are down Once the alert has sounded briefly press the push switch to cancel the alert If you do have the undercarriage down switch the alert will be suppressed if the undercarriage is down when speed director mode is entered Configuring the general alert If you want to use the general alert feature move the GA switch to the on position When enabled the general alert will be triggered by a low level on the general alert input IO 1 Once the alert has sounded briefly press the push switch to cancel the alert www smartavionics com Firmware upgrade switch 2 1 4 Firmware upgrade switch This switch is turned on to enable the firmware to be upgraded via the micro USB connector In normal operation this switch must be off 2 2 Mounting the enclosure The enclosure can be mounted in any convenient position and orientation within
21. only needs to be repeated if the SmartASS 3 is re positioned www smartavionics com Push switch summary This orientation operation can be carried out in flight just take care to ensure that the aircraft is flying straight and level and that you are not subject to any vertical accelerations at the time 3 2 2 3 Zeroing the pressure sensor Press and hold the push switch until you have heard the fourth beep When the switch is released the SmartASS 3 will say Airspeed zeroed 3 2 3 Push switch summary This table summarises the operation of the push switch Table 3 1 Push switch functions Action Effect 1 short press Silence alert 1 short press Toggle between talking ASI and speed director or sleep modes 2 short presses Enter sleep mode Hold for 1 beep Capture current airspeed and enter speed director mode Hold for 2 beeps Cycle through airspeed repeat periods Hold for 3 beeps Orientate accelerometer Hold for 4 beeps Zero pressure sensor 3 3 Zeroing the SmartASS 3 To ensure the airspeed reported by the SmartASS 3 is as accurate as possible the unit requires zeroing occasionally This will remove any offset error introduced as the pressure sensor and the electronic components age Whenever the SmartASS 3 is turned on as long as the current differential pressure is small it will be zeroed automatically to remove the offset error If the differential pressure is not sm
22. s or enable the undercarriage or general alert functions you will need to access the configuration switches on the circuit board To gain access to the board remove the 10 way connector and the SD card and then remove the four screws and the front plate and slide the board out Four switches are located together in one block on the left side of the PCB One other switch is located about 3cm away 4 o clock position from the block of 4 All the switches have yellow tops and a small arrow that shows the direction the switch must be moved to turn it on Use the end of a small screwdriver or pencil to move the switch and make sure that the other switches are not moved also it s rather easy to do that Fig 2 1 shows the layout of the switches in their default positions all off After the switches have been configured slide the PCB back into the case and replace the front plate and screws Reinsert the SD card and 10 way connector A Important The circuit board contains components that may be damaged by static electricity Try to avoid touching the components on the board and if possible remove any static charge that you may be carrying by touching something that is earthed before handling the unit www smartavionics com 5 Configuring the speed units 2 1 1 2 1 2 2 1 3 UPGRADE FIRMWARE OFF Fig 2 1 Configuration Switches Configuring the speed units By default the SmartASS 3 reports the airspeed i
23. s should be connected obviously depends on the specific equipment being connected to This is connected to 12V via a fuse or circuit breaker The current requirement of the SmartASS 3 is small so the fuse rating need not be more than 1A The SmartASS 3 does not have an on off switch as it doesn t really need one but if you wish you could put a switch into this line www smartavionics com Alert connections ta Note Intercoms and radios often have the ability to mute the auxiliary input when radio transmissions are being received It is up to you to decide whether to mute the output from the SmartASS 3 or not E Note Ifthe volume of the SmartASS 3 s output is not well matched to the sensitivity of the existing equipment s input and that equipment has no means of adjusting its sensitivity please contact Smart Avionics for advice 2 5 2 Alert connections If you wish to use the audio alerts two more wires can be connected UC terminal 6 Ifyou want to use the undercarriage warning facility install a switch that connects this terminal to ground when the undercarriage is down and locked When the undercarriage alert is activated you will hear DING Check wheels down Pressing the push switch briefly or putting the undercarriage down will silence the alert Remember to enable this feature by setting the appropriate configuration switch as described on Section 2 1 2 10 1 terminal 7 Switching this termina
24. speed is less than 25 Knots 30 MPH 50 KPH the voice is muted When the SmartASS 3 is powered up it always starts in talking ASI mode Speed director mode In this mode the airspeed is continuously measured and compared to a target speed The SmartASS 3 reports as follows If the speed is within 5 of the target speed it says Speed good every 8 seconds Ifthe speed is between 5 and 10 too fast it says Fast every 4 seconds If the speed is between 5 and 10 too slow it says Slow every 4 seconds If the speed is between 10 and 15 too fast it says Very fast every 2 seconds If the speed is between 10 and 15 too slow it says Very slow every 2 seconds Ifthe speed is more than 15 too slow or too fast the appropriate message is prefixed with a chime As the wing loading increases the SmartASS 3 estimates how much this will increase the stall speed and it subtracts that amount from the current airspeed If the pilot pulls G the SmartASS 3 will immediately report that the aircraft is slow even though the actual airspeed has not yet changed Unloading the wing will immediately make the SmartASS 3 report a speed increase The SmartASS 3 ignores reduced G less than 1 so it will not be fooled into telling you that you are fast if you move the stick forward rapidly www smartavionics com 11 Sleep mode If the speed drops to below 80 of the target speed or
25. the instrument panel area If possible mount close to the centreline of the aircraft to minimise the effect of roll on the accelerometer readings this isn t absolutely essential Remember to leave adequate space so that the pitot and static lines are not kinked Although the SmartASS 3 is robust avoid subjecting it to excessive vibration or extremes of temperature A Important Take care to ensure that the SD card is fully home in its socket as it is quite easy to eject the card by mistake 2 3 Mounting the control knob The control knob should be mounted in a position such that it can easily be operated while flying The hole required is 10 2mm diameter with 8 3mm flats to stop the potentiometer body from turning The potentiometer manufacturer s recommended torque for tightening the retaining nut is 45cN m If the wires from the control knob to the enclosure are too long they may either be shortened or coiled up 2 4 Pitot and static connections The SmartASS 3 s pressure sensor has barbed connections suitable for 4 mm ID hose Exactly how the pitot and static connections are plumbed into the aircraft s pitot and static lines will be different for each aircraft but generally speaking tee connectors can be inserted into the existing lines so that the SmartASS 3 is connected in parallel with the existing ASI Take care to ensure that all the connections are sound and that no leaks are present Important Once the instal
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