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1. Soldering Iron Base front view side view Temperature Adjust Power Switch Wire to Handpiece Soldering iron Handpiece A o Wire to Base Grip Barrel Tip hold iron here contains heater melts solder Tip cutaway view Caution These parts get very hot during ree tinned coating operation Do NOT touch until cool Iron Plate cooper Fino Mechatronics Design L 21 Jan 2015 Soldering Procedure Tip Maintenence gt The tip is what heats things up gt Want to maximize thermal transfer gt Keep the tip tinned with solder gt Provides better thermal transfer gt Sacrificial layer preventing tip oxidation which destroys the tip gt Must be occasionally refreshed gt The solder oxidizes accelerated by heat gt Cleaning wipe on brass or wet sponge gt Immediately re tin apply solder layer Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1 15 722 Procedure Soldering Procedure gt Beginner s tip use iron to heat up component and board not solder gt Feed solder in through the other side gt Solder only melts when component and board sufficiently hot gt Maximizing heat transfer gt Point tips solder using side of tip not point gt Chisel tips use the broad flat end Soldering Procedure Heat one side feed solder from touching both opposite side component and touching the board and component but board not the iron SO
2. Example solder joints through hole soldering 4 gt Note most production boards today are surface mount to save space Surface mount Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1 Theory Safety Precautions gt Soldering melts metal IT S HOT gt Tips typically set at 700 F 371 C gt Irons can stay hot after turning off gt Touching a hot tip is NOT fun gt Leaded solder contains well lead gt which is known to the state of California to cause cancer and reproductive harm gt WASH YOUR HANDS AFTERWARDS gt Solder vaporizes flux producing fumes gt Regular exposure linked to asthma lie F gt DON T BREATHE THEM IN Lead poisoning gt May also cause solder splatter not as fun in real life safety goggles recommended Fox Mechatronics Design Lab Soldering Theory Oxidation gt Soldering depends on good thermal transfer from tip to solder component board ee ee Solder a f en gt Metals oxidize forming an oxide layer Om gt Oxides impede thermal transfer 7 gt Reactions faster at higher temperatures Solder cross section gt Flux provides chemical cleaning showing flux core gt Rosin flux is corrosive when heated gt and is present in solder wire spools gt but is burned upon use v Just keep this in mind Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1 13 722 Soldering Theory Equipment Overview
3. EECS 192 Mechatronics Design Lab GSI Richard Ducky Lin 21 Jan 2015 Week 1 WE Administrivia E FRDM Board Intro E Soldering Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1 Lye Administrivia Getting Started Welcome Welcome to EE192 Ducky UCB EECS Mechatronics Design L 21 Jan 2015 Week 1 Administrivia Getting Started Project v Project build an autonomous track following racecar given a stock chassis and microcontroller dev kit Teams should be 3 students gt Combined skillset should include mechanical design fabrication electronics programming gt Controls experience helpful y v Teams formed by checkoff Friday v Read the competition rules gt Freescale Cup gt NATCAR Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1 3 Do Getting Started Checkoffs gt One hour time slot on Friday 11 30am 12 30pm to demonstrate that your project is where it should be gt At least one team member needs to show up to run your hardware gt These are graded half credit if late Get your cars gt First checkoff this Friday gt Form project teams and check out cars gt Checks4Cars program trade a 300 deposit check for a car gt Get private course GitHub repository gt Details on website Mechatronics Design Lab Administrivia Getting Started Git Refresher gt Git distributed version control softwa
4. LDER ERG a a 21 Jan 2015 Week 1 Mechatronics Design Lab Ducky UCB EECS Soldering Procedure Joint Inspection Optimal joint shape is a solder volcano Common Joints Good Bad Bad Concave shape Not enough solder Too much solder Adheres to board convex shape and component Cold Joints may not make a reliable electrical connection Awful Awful Solder did not Solder did not adhere to board adhere to component May not be obvious ata glance Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1 eee Soldering Lab Through Hole Soldering Demo Live Demo which REALLY hopefully goes Murphy free Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1 Soldering Lab Scheduling gt Quick poll best time for GSI office hours about 2 per week gt Thursday for the pre checkoff scramble gt Other times gt Thursday section only has schedules cleared up enough to move discussion to Wednesday gt Otherwise future discussion sections starting Thu 29 Jan will be 9 30am 10 30am Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1 19 22 Soldering Lab Electrostatic Discharge gt You build up static charge on your body gt just by walking especially when it s dry gt and up to several kV gt but under 2kV is imperceptible gt Chips are sensitive to high voltages may cause permanent damage gt read board s
5. re e gt Each commit like complete snapshot gt Branches separate chains of commits 1 gt eventually merged back to its parent gt Distributed everyone has compete copy F r git logo by Jason Long CC BY 3 0 gt Most operations local periodically sync gt Best Practices gt Small logical often commits Learn git here gt Write good commit messages try github io gt Develop in branches keep master clean Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1 Hardware Hardware v FRDM KL25Z Development Board MKL25Z128VLK4 microcontroller gt 48MHz ARM Cortex M0 gt 128KB flash gt 16KB SRAM gt Programmable using USB v v 1 O headers including gt GPIO 16 bit analog inputs ADC FRDM KL25Z Board gt gt 12 bit analog output DAC image from KL25Z User s Manual gt PWM I C SPI and UART modules On board RGB LED and accelerometer v Mechatronics Design Lab FRDM Board Intro MCU Refresher lO Refresher gt GPIO general purpose input output pins http developer mbed org handbook DigitalOut http developer mbed org handbook DigitalIn k S EE gt As an output sets voltage on pin from a software either GND 0 or Vdd 1 H gt As an input samples voltage on the pin a 7T returning either 0 low or 1 high gt PWM pulse width modulation module http developer mbed org handbook Pwm0ut FRDM KL25Z pinout g
6. read wait 250 wait 0 25 led_blue write 1 0 5 led_green 1 Thread wait 250 wait 0 25 led_blue write 1 0 75 Thread wait 250 Mandatory Hello world serial printf Hello world r n Run led_fade_thread in own thread void led_blink_periodic Thread ledFadeThread led_fade_thread void const args Toggle the red LED when called Periodically call led_blink_periodic led_red led_red RtosTimer ledBlinkTimer led_blink_periodic ledBlinkTimer start 1000 Work is done in the threads so main can sleep Thread wait osWaitForever Ducky UCB EECS Mechatronics Design 21 Jan 2015 Week 1 9 22 FRDM Board Intro keleton Code Hello World Demo Live Demo This is essentially the procedure demonstrated in the checkpoint 1 page and hopefully goes Murphy free Note you ll have to download the Device Family Pack for the FRDM KL25Z http www keil com dd2 arm armcm0 also on the checkpoint page Ducky UCB EECS Mechatronics Design L 21 Jan 2015 Week 1 10 Soldering Theory Overview gt Soldering joining electrically and mechanically metals using a separate fillter metal solder gt Electronics bonding component pins leads to circuit board through holes or pads Waou gt Solder is usually a tin lead alloy e g 63 37 or lead free tin silver copper alloy Through hole e g SAC305 gt This tutorial focuses on introductory
7. t Every period the pin is high based on the duty cycle then low for the remainder gt Can digitally approximate analog outputs gt Analog Inputs ADC http developer mbed org handbook AnalogIn image from gt Converts a continuous analog voltage 0 3 3v to a 16 bit 0 65535 quantity Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1 FRDM Board Intro MCU Refresher Concurrency Refresher gt FRDM KL25Z s processor is single core gt Blocking Operations gt Operations do not return until finished blocking thread of control gt IO operations may be lengthy gt Nonblocking Operations gt Operations return immediately activity continues in the background gt IO operations can buffer data and use interrupts to send receive data gt Threading and RTOS http developer mbed org handbook RTOS gt mBed has a RTOS with threading concurrency and synchronization gt Beware of threading anti patterns Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1 FRDM Board Intro Skeleton Code Hello World Code MODSERIAL serial USBTX USBRX void led_fade_thread void const args DigitalOut led_green LED_GREEN Note this doesn t temrinate DigitalOut led_red LED_RED while 1 PwmOut led_blue LED_BLUE Invert duty cycle led_blue write 1 0 int main Thread wait 250 Internal LED is active low led_blue write 1 0 25 led_green 0 Th
8. tops working for no reason Don t let this happen gt Remember to ground discharge yourself to you before handling sensitive electronics gt Touch the grounded lab bench surface gt Use a ESD wriststrap gt Avoid touching traces on boards Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1 20 22 Soldering Lab Get your parts and get started I ll be walking around helping For checkpoint 1 you need to solder a resistor and LED onto perfboard Choose the resistor such that 1 6mA goes through the LED The MCU supply voltage is 3 3v yes know those red LEDs suck Also grab a computer account form Ducky UCB EECS Mechatronics Design Lab 21 Jan 2015 Week 1

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