bike generator: https://www.instructables.com/Bike-Generator/
electric bike w/ regen, $200: https://spectrum.ieee.org/electric-bike
recycled lithium ion battery project
mfr # 54:
mounting details: https://www.keyelco.com/userAssets/file/M65p35.pdf
Adafruit charger board powerboost 500 1944: https://www.adafruit.com/product/1944
adafruit charger board powerboost 1000 2465: https://www.adafruit.com/product/2465
How to make your Weller wireless: https://hackaday.com/2016/09/01/how-to-make-your-weller-wireless/
use-case -- would like to be able to use any found battery regardless of whether our own rechargeable battery is usable / attached.
notes on building an iOS charger -- https://surfncircuits.com/2017/04/17/build-your-own-super-fast-iphone-and-ipad-charger/#:~:text=The%20iPhone%2FiPad%20will%20charge,pull%2Ddown%20resistors%20to%20ground.
mini boost board from adafriut: https://www.adafruit.com/product/4654
testing linear regs for solar -- https://hackaday.io/project/167731-testing-cheap-linear-li-ion-chargers-for-solar
adafruit universal solar charger -- https://www.adafruit.com/product/4755?gclid=CjwKCAjwj8eJBhA5EiwAg3z0m8pR-K0VVaCii9vLc6v-5gllRUgpaZQn74dGXHO2fr2EmlnLuZs4ExoCacMQAvD_BwE
input -- can take in 5-10V ... so DC-DC input is an option ... as well as 5V solar panels!
adafruit small solar -- https://www.adafruit.com/product/3809
deer solar panel -- https://www.amazon.com/ZEALLIFE-6V-Solar-Panel-Waterproof/dp/B07LD9YN27
cigarette lighter adapter fused https://www.amazon.com/Roadpro-Replacement-Cigarette-Lighter-RPPS-225/dp/B0016LG0CY
basic AC soldering station, weller, $40 -- 40 Watts https://www.amazon.com/Weller-WLC100-40-Watt-Soldering-Station/dp/B000AS28UC
Nice fuse, via Mike: https://www.digikey.com/en/products/detail/texas-instruments/TPS25940ARVCT/4915501
clamp cables for batteries -- https://www.amazon.com/Nilight-GA-ACC-01-Alligator-Charging-Terminal/dp/B0768CW328/ref=asc_df_B0768CW328/?tag=hyprod-20&linkCode=df0&hvadid=241994092016&hvpos=&hvnetw=g&hvrand=8698495735035782115&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9001876&hvtargid=pla-569013347506&psc=1
adafruit universal charger pinouts -- https://learn.adafruit.com/adafruit-bq24074-universal-usb-dc-solar-charger-breakout/pinouts
VX78-500 DCDC Datasheet -- https://www.cui.com/product/resource/vx78-500.pdf
need: PTC fuse (sparkfun) or glass fuse (footprint for both? get kit from sparkfun?)
caps for DCDC
holder for lithium ion
terminals to connect to 12V battery
cables for connecting to 12V battery
Update: looks like we should use the boost breakout from adafruit, in lieu of the powerboost 500 -- that way we avoid some confusion around the usb plug-in. if we were to use the powerboost 500, a user might plug in a microUSB cable w/ 5V into it, which would backfeed the 'out' pin on the universal charger.
deep cycle battery: https://www.amazon.com/Sealed-Lead-Acid-Cycle-Battery/dp/B005CLPOQM
powerboost circuit, showing iphone resistors https://cdn-learn.adafruit.com/assets/assets/000/024/638/original/adafruit_products_sch.png?1429650091
actually -- apparently this will actually try to pull 1 amp from the circuit ...
if you want to limit to 500 mA, then use this resistor network:
from adafruit, 'icharging' -- https://learn.adafruit.com/minty-boost/icharging
CUI datasheet -- https://www.cui.com/product/resource/vx78-500.pdf
which circuit topology? https://www.embeddedrelated.com/showarticle/98.php
punchline -- use a low-side n-channel mosfet
Prototyping PMW with an n-channel mosfet ...
we have an IRF820 here:
Using N-channel mosfet to switch on/off a 12V motor https://www.youtube.com/watch?v=3PkpOeHTnfo
Nice summary here -- which suggests adding resistor between gate and GPIO https://electronics.stackexchange.com/questions/235672/for-3-3v-microprocessors-whats-the-best-way-to-power-the-gate-of-a-mosfet
Update: was not using a logic-level mosfet. Need to grab one.
e.g. adafruit has a nice one here: https://cdn-shop.adafruit.com/datasheets/irlb8721pbf.pdf
On Digikey here
Heater application --
Notes on running heating elements in PWM mode https://electronics.stackexchange.com/questions/127064/what-are-some-problems-with-running-a-heating-element-in-pwm-mode
Upshot: can have very slow PWM duty cycle (40 sec say)
IRLB8721PbF datasheet: https://cdn-shop.adafruit.com/datasheets/irlb8721pbf.pdf
Upshot: worked nicely as per "Using N-channel mosfet to switch on/off a 12V motor" notes / diagram above; the IRLB8721PbF is an n-channel fet; I'd tried a p-channel accidentally. N-channels are the one that Mike suggested almost always be used. Diagram:
See this note on duty cycles, "Normal PWM is not suitable for switching heating elements..." here: https://electronics.stackexchange.com/questions/127064/what-are-some-problems-with-running-a-heating-element-in-pwm-mode
(actually, looks like this information may be wrong -- PWM might be fine)
Nice discussion on resistive heating elements http://www.plctalk.net/qanda/showthread.php?t=116582
Good thread on issues around heating -- add a fuse in line, PTC, other -- https://www.sparkfun.com/news/1340?_ga=2.56045666.891433149.1637516873-163747255.1632182571
Digital multimeter fuse https://www.amazon.com/dp/B07CB968SQ/ref=sspa_dk_detail_5?psc=1&pd_rd_i=B07CB968SQ&pd_rd_w=gvQxl&pf_rd_p=887084a2-5c34-4113-a4f8-b7947847c308&pd_rd_wg=MIXWU&pf_rd_r=4TN41YEQR1R5SBQCJN75&pd_rd_r=ad099993-0585-4191-8205-64fe8257a6ad&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyN082REpZNEE5VlEwJmVuY3J5cHRlZElkPUEwNjU4NDEwMjY4WEtFS0tQVFA2SSZlbmNyeXB0ZWRBZElkPUEwMjU2MDkwMjNUV1c1WEFNMTE1WCZ3aWRnZXROYW1lPXNwX2RldGFpbCZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=
Drilling holes in metal: https://www.familyhandyman.com/list/tips-for-drilling-holes-in-metal/
Guide to batteries: https://www.otherpower.com/off-grid-battery-guide
Great video showing battery corrosion https://www.youtube.com/watch?v=hywkWB5a9GY
How a lead acid battery work https://www.youtube.com/watch?v=rhIRD5YVNbs
Wind power ...
Using a car alternator for wheel electricity generation https://www.youtube.com/watch?v=zVBR3HNjlYw
Which motor type is the best generator? https://www.youtube.com/watch?v=cJ_vDA7xsGs
Great explanation here: https://www.windynation.com/jzv/inf/making-wind-power-how-choose-right-motor
A Volts-to-RPM ratio of AT LEAST 0.035 is the minimum requirement when looking for a permanent magnet motor. If the number is higher than 0.035 that is perfect. If the number is lower than 0.035, it will likely be insufficient unless it is located in an area with high winds.
hall effect sensor A3144E
vibration sensor https://www.adafruit.com/product/1767
hall effect sparkfun AH1815 https://www.sparkfun.com/products/14709
nice tutorial on hall effect sensors [https://www.studiopieters.nl/3144-hall-effect-sensor/](https://www.studiopieters.nl/3144-hall-effect-sensor/
Note: these two tutorials above suggest using the 3144 ... but it's a 5V supply.
Current sensor from adafruit on digikey: https://www.digikey.com/en/products/detail/adafruit-industries-llc/904/5353628
RPM vs voltage for brushless motor https://www.youtube.com/watch?v=JD1gplvhGrc
Hall effect sensors on digikey https://www.digikey.com/en/products/filter/sensors-transducers/565?ColumnSort=0&FV=450043b%2C450006d%2C4500445%2C4500446%2C450006f%2C4500464%2C45004c8%2C4500504%2C4500565%2C4500567%2C4500569%2C450008c%2C450008d%2C4500011%2C4500012%2C45000c5%2C45000c9%2C45000cd%2C450080e%2C450080f%2C450081a%2C4500017%2C4500b3b%2C4500124%2C4500cd1%2C4500e5a%2C4500e97%2C450017c%2C450017d%2C4500180%2C4500188%2C4500196%2C450019e%2C45010a4%2C450120c%2C450126a%2C4501278%2C4500030%2C45001e9%2C45001f5%2C45013a7%2C450020a%2C450028c%2C45002f2%2C450004f%2C450031a%2C45003d7%2Cffe00235&page=1&pageSize=25&pv1989=0&quantity=&s=N4IgjCBcoLQExVAYygFwE4FcCmAaEA9lANogCsIAugL7X4KSkAWAhgDZsAE2AZj9klQh8VakA&sf=1&sv=0
Windmill wheel -- how to replace axle on bike
Streaming video footprint: 0.077 kWh of electricity per hour