AASaver 2.1 User Manual
Contents
1.2. AA batteries for charging your phone by using a LiPo battery as the intermediate bucket 7 Using AASaver to Charge LiPo Battery from USB Want to use AASaver to charge your LiPo battery from USB Where there is a will there is a way To do so you will need a USB Male A to Male A cable This is not a common cable but you can still find it on Amazon for just a few bucks or if you are in the mood take apart two existing USB cables and make one yourself Plug one end of the cable to AASaver s USB port and the other end to your computer s USB port Now you can charge a LiPo battery from your computer s USB port 8 Creative Uses of AASaver Now that you are familiar with the built in components of AASaver you can think of more creative ways to use it for For example you can combine it with a 6V solar cell to make a solar charger for LiPo battery To do so connect a 6V solar cell to the VCC GND pins better with a 1N4148 diode in series to prevent reverse charge This way you can make use of the LiPo charger on board to charge LiPo battery from the solar cell Soeaking of solar cell you can add a photoresistor and transistor to make the LEDs light up only when it s dark A more advanced modification is to add a 555 timer circuit to provide timing control for example let LEDs turn off automatically after 2 hours Specifications e Startup Voltage 0 9V e Power Source two AA AAA can be modified to work with one AA AAA
3. or one 3 7V LiPo e Output Voltage regulated 5V from boost converter 3 3V from LDO e Output Current up to 500mA 5V and up to 250mA 3 3V e LiPo Charging adjustable current from 10mA to 220mA e Size 70mm x 38mm x 30mm e Weight 85g 30z w o battery Terms and Conditions AASaver is an open source project The hardware design and software code are made publicly available under the Creative Commons Attribution ShareAlike CC BY SA 3 0 license The product is open source for educational purpose The hardware and software are provided as is We Rayshobby LLC are not responsible for any damage or accident that may occur due to either hardware or software error or during the assembly use and modification of AASaver Open Source Links e AASaver Github Repository e AASaver homepage e Rayshobby Forum Schematic FAQ Q How is AASaver different from Joule Thief AASaver uses a switching boost converter On a high level it s similar to Joule Thief in that both make use of oscillation and inductor to boost the battery voltage However boost converter is more efficient and can provide regulated output voltage while Joule Thief does not regulate the output voltage Q How is AASaver different from Adafruit s MintyBoost They use different boost converter chips AASaver uses CE8301 with 0 9V startup voltage while MintyBoost uses LT1302 with 2V startup voltage So AASaver can w
4. Pin Headers matches the pins on standard breadboards Hardware Interface The image below shows a close up image of the AASaver and marks the built in components 5V 3 3V Voltage Booster e CE8301 LED Switch USB Port AASaver v 1 Led U 3 http aasaver rayshe by net sN B tOn na l mn AAG Source Selector LiPo Charger Flashlight Breadboard Charging Power Switch LEDs Pin Headers Current Pot Instructions 1 Attach the Battery Holder Use the two screws and nuts to fix the battery holder to the circuit board Orient the holder such that the wires come out from the side with the power source selector i e away from the USB port ii MWA AM C Next cut the wires to 0 8 to 1 inch long and strip the wires DO NOT cut them too short Apply some solder to tin the wires this will prevent splitting strands Insert the wires to the battery pins make sure the Red wire goes to the hole marked this is the positive wire Go ahead and solder the wires to the circuit board Double check yours with the images below Solder points Cut to 0 8 strip and tin Once the battery holder is in place you can pop in two AA batteries and turn on the power switch The red LED on the voltage booster should light up The green charging LED might also light up There is a 5V 3 3V voltage selector which sets the voltage between VCC GND The voltage booster and USB port always outputs
5. 5V and 3 3V is achieved by an on board 3 3V linear regulator Depending on the battery condition the 5V output can deliver up to 500mA current the 3 3V output can deliver up to 250mA 5V 3 3V selector ae 188mA s 220aA Charging 2 Solder Flashlight LEDs AASaver supports two built in flashlight LEDs First insert the LEDs into the LED pin holes Make sure the longer lead of the LED this is the positive lead goes into the hole marked Gently bend the pins to 90 degree Solder the leads and use a diagonal cutter to cut the extra leads There is a separate LED on off switch The 5V 3 3V voltage selector is also effective at 5V output voltage the LEDs are considerably brighter than 3 3V so this can be used for brightness control LED switch Breadboard Power Supply 3 Optional Solder Breadboard Pin Headers Now solder the breadboard pin headers This step is optional it s only necessary if you plan to use AASaver as a breadboard power supply First insert the two pin headers at the end of a breadboard This will help fixing them in place during soldering Next align the VCC GND holes on the AASaver with the pin headers and solder the pin headers to the circuit board The pin header spacing matches the width of a standard breadboard If your breadboard is wider use the extra VCC GND pins on the left as shown in the picture below The 5V 3 3V selector is effective to breadboard pin headers so you can use
6. AASaver v2 1 User Manual Updated June 20 2014 Contents PMN OC CONN ccs c cc sce acs EE AA cise es ac re sd ce bles See ec ie oc ree tc ode et sete ee eee ee FIA e TA ONT ACO acts aa E E uta cnaoiuavuicbadasenmuiiarauesaneennciuasiela saeco unendacenaaulessnanind tulaledecenncntess FNS PUIG CIOS aren eset ctaronnecnsacsceeeu E E E Met CAGE the Battery Holdi ace c ace heaset enn tera ee ekeuceeaac sat iceradea ea ncio anne a OOIOEN Flas Gil LEDS checosesanccossacsoaeace aunue secencseane EE secancuesetassaceeaneuoncean Optional Solder Breadboard Pin HEaders cccccccesscccseccceeecsceececeececenecseeueeseeuceeeuecseeueceteeseeeneeees JUsmng AASaver as USB Chargen aciactcaerctsnn es ncin in scuieane dacs enen N Ea ar aeei NENA N EA ENE NEE D 2 3 4 5 Using AASaver as Lithium Polymer LiPo Battery Charger cccccccssseccccsecceeeesececeeseceeeeeeceeeeeneeeeas 6 Using Lithium Polymer LiPo Battery as Power SOUTCe cccceeccceeececeeececeneceeeneceeeeceseueceteueceneueeeeensss 7 Using AASaver to Charge LiPo Battery from USB sssesssssssensesserssrreserreresrrrrssrereserersseeresreeesseereserersseere 8 Creative Uses Of AASaver ccccccsssssssseccccccssaeesseeccccesssaeessseeccecesseeesseeeeecesssaeusseeesecesssauassseeceesessaaaaeeeseess PECON r EE EATE EE EE AE T et tee Terms and Conditions esssssssssssseresssserresssrrerssssrrresssrrreesssreresssereressserresssetrresssteressserresssereessse
7. ery Charger AASaver 2 1 has a built in LiPo charging chip You can use it to charge a standard 3 7V LiPo battery The charging current is adjustable from 10mA to 220mA using an on board potentiometer The picture on the right below shows it s charging a LiPo battery at 22mA To increase or decrease the charging current just use a screw driver to rotate the potentiometer There is a green LED that shows the charging status the LED will turn off when the LiPo battery is fully charged Why adjustable current Well as mentioned above the condition of the batteries determines how much current they can deliver Dead batteries can t deliver a whole lot so you need to let them drain slowly As you will see below you can still harness even dead batteries to charge your phone the trick is to use a LiPo battery to collect the charges slowly from dead batteries analogous to collecting water slowly into a bucket then the LiPo battery can serve as the power source to charge your phone 6 Using Lithium Polymer LiPo Battery as Power Source Instead of AA batteries you can use a 3 7V LiPo battery as source to the voltage booster This is done via the Source selector switch Because LiPo battery typically has higher voltage than AA batteries the voltage booster is capable of delivering even higher current i e beyond 500mA at 5V output As the discussion above goes this allows you to suck the remaining energy in dead
8. it as a 5V 3 3V selectable breadboard power supply For wider E bee BHL breadboard 4 Using AASaver as USB Charger AASaver 2 1 has a built in USB port You can use it to charge your phone or other USB devices all from two AA batteries While dead AA batteries can be used to light up LEDs and power breadboard circuits to charge your phone you will likely need a fresh pair of batteries Technically the phone will draw a considerable amount a few hundred milliamps of current To deliver the current the voltage booster needs to work really hard and draw even more current from the AA batteries Dead batteries are not strong enough to deliver that current consequently the voltage booster cannot maintain regulated 5V output and hence the charging stops If your phone stops charging consider changing the batteries and try again The actual charging current varies from phone to phone The picture on the right below shows my Samsung Galaxy S3 charging at 261mA from two used AA batteries The latest iPhones e g iPhone 5 require a charging current of 500mA which will likely reach the limit of the AASaver However even if the phone reports it s not charging in practice it s still charging at a low current usually 100mA So in case your battery condition is not suitable for delivering 500mA don t lose hope just leave it on for a while your phone is still being charged 5 Using AASaver as Lithium Polymer LiPo Batt
9. ork with batteries that have very low voltage Also AASaver is designed to be multi purpose with built in LED flashlight breadboard pin headers 5V 3 3V selectable output voltage USB port Lithium charging chip while MintyBoost is primarily used for USB charging Q How is AASaver 2 1 different from its prior versions The very first version AASaver 1 0 used MCP1640 boost converter chip version 1 1 added separate on off switch for the LEDs version 2 0 changed to use NCP1450 boost converter and added on board LiPo charging chip USB port and source selector version 2 1 is different from 2 0 in that it switched to use CE8301 boost converter and added 5V 3 3V selectable output voltage Q What made you come up with the idea always have a pile of dead AA batteries from TV remotes smoke alarms and other gadgets These batteries cannot be used in standard devices but they actually still have quite a bit of juice in them One day was learning the principles of voltage booster and it came to my mind that I can use it to harvest the remaining energy in dead AA batteries for something useful My goal is to make it versatile so a single circuit can be used for multiple purposes such as lighting up LEDs powering breadboard circuits charging LiPo batteries and charging USB devices It s so useful that think everyone should have a couple of these Q Do you have an enclosure case to go with the AASaver Unfortunately not
10. reeesseereesseeeeee OPER OUr E LINE aa a A E EEE CREM O e a ee eee eee Introduction Throwing away dead AA batteries Don t Try them with the AASaver a versatile voltage booster for AA AAA batteries AASaver harvests the remaining energy in dead batteries You will be surprised how long they can still last to power LEDs and breadboard circuits But AASaver can do a lot more With fresh batteries you can also use it to charge your phone USB gadgets or Lithium Polymer batteries The AASaver kit includes a partially assembled and tested circuit board battery holder flashlight LEDs breadboard pin headers screws and nuts A small number of soldering and assembly steps are required The estimated assembly time is 15 minutes i e Se i il MABE USA ABRION 1 DURACELL PILEALCALINE 2 sartOste 3109 NO WISOWNI LN sid V1 1134 NY W313 HID IY Gica D Features and Built in Components e Power Source AA AAA batteries or 3 7V LiPo battery selectable via an on board switch e Output Voltage regulated 5V 3 3V selectable via an on board switch up to 500mA 250mA e Built in Flashlight LEDs a pair of high current 30mA white LEDs with on off switch e Built in USB port for charging phone MP3 player or other USB gadgets up to 500mA e Built in Lithium charger for charging Lithium Polymer batteries charging current adjustable from 10mA to 220mA via an on board potentiometer e Built in Breadboard
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