Edge Collective: Off-grid power

https://www.instructables.com/personal-powerPlant/

bike generator: https://www.instructables.com/Bike-Generator/

electric bike w/ regen, $200: https://spectrum.ieee.org/electric-bike


2021-08-30 13:05:43

recycled lithium ion battery project

mfr # 54:

li-ion clip: https://www.digikey.com/en/products/detail/keystone-electronics/54/2254090

datasheet: https://www.keyelco.com/userAssets/file/M65p11.pdf

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


2021-08-30 13:19:54

How to make your Weller wireless: https://hackaday.com/2016/09/01/how-to-make-your-weller-wireless/


2021-08-31 12:49:42


2021-09-02 12:24:32

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.

from: https://learn.adafruit.com/assets/17555

mini boost board from adafriut: https://www.adafruit.com/product/4654

mini lithium ion charger: https://www.adafruit.com/product/1904?gclid=Cj0KCQjw7MGJBhD-ARIsAMZ0eeuoD2dAlN-PmjzzObB_W6UXimCcOiKV3vXKV7imbpoNHOwxtqcgY_oaAl8MEALw_wcB


2021-09-03 07:41:01

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


2021-09-04 15:37:15

inverter -- https://www.amazon.com/BESTEK-300W-Power-Inverter-Adapter/dp/B004MDXS0U

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


2021-09-22 16:15:04

Nice fuse, via Mike: https://www.digikey.com/en/products/detail/texas-instruments/TPS25940ARVCT/4915501


2021-09-27 10:00:41

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

powerboost 500 schematic https://cdn-learn.adafruit.com/assets/assets/000/017/555/original/adafruit_products_powerboost500C.png?1403289316

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


2021-09-30 12:28:36

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.


2021-10-01 11:17:00

deep cycle battery: https://www.amazon.com/Sealed-Lead-Acid-Cycle-Battery/dp/B005CLPOQM


2021-10-04 18:53:28

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


2021-10-04 20:34:39


2021-10-05 09:46:03

CUI datasheet -- https://www.cui.com/product/resource/vx78-500.pdf


2021-10-19 08:27:45

Lithium mining https://www.spglobal.com/en/research-insights/articles/lithium-supply-is-set-to-triple-by-2025-will-it-be-enough


2021-11-08 11:42:37

Heating ...

https://astronomersanonymous.wordpress.com/2016/04/02/controlling-heating-pads-with-arduino-uno/

https://learn.sparkfun.com/tutorials/heating-pad-hand-warmer-blanket

http://bildr.org/2012/03/rfp30n06le-arduino/

which circuit topology? https://www.embeddedrelated.com/showarticle/98.php

punchline -- use a low-side n-channel mosfet


2021-11-09 10:51:45

Prototyping PMW with an n-channel mosfet ...

we have an IRF820 here:

https://www.vishay.com/docs/91059/91059.pdfn%20channel

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

IRLB8721PbF

On Digikey here


2021-11-21 11:40:14

Heater application --

https://www.reddit.com/r/AskElectronics/comments/1156tx/pwm_for_a_heater_using_nmosfet%C2%B5c/

https://circuitjournal.com/how-to-use-a-p-channel-mosfet-with-an-arduino

IRF4905 https://www.infineon.com/cms/en/product/power/mosfet/p-channel/irf4905/ and datasheet

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)


2021-11-21 12:52:16

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:


2021-11-21 20:12:20

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

Thermal fuse https://www.amazon.com/Microtemp-Thermal-x2103-Cut-off-Skywalking/dp/B00EC83QES

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=


2021-11-24 17:53:41

Drilling holes in metal: https://www.familyhandyman.com/list/tips-for-drilling-holes-in-metal/

http://nrgcycle.com/

https://www.youtube.com/results?search_query=bicycle+wheel+belt+diy

https://www.youtube.com/channel/UCL2soflHdZyT0PgrVxakxWA

https://www.notechmagazine.com/2009/12/windmills-and-wind-motors-how-to-build-and-run-them-1910.html

https://makezine.com/projects/backyard-wind-power/


2021-11-28 20:12:08

Wind power

https://www.instructables.com/Ted-Baer-s-Bicycle-Wheel-Windmill/

https://www.otherpower.com/otherpower_experiments_tapedrivemotors.html


2021-11-28 20:20:19

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


2021-12-02 12:29:07

Wind power ...

https://www.youtube.com/watch?v=7v2JcXYDLpo

https://paginas.fe.up.pt/~feliz/e_paper15_BicycleWindTurbine.pdf

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