Here are the files and the code for a 100W flashlight. The flashlight has an OLED display that shows the temperature of the heatsink, brightness, fan speed, battery voltage, and battery percentage. The fan are temperature-controlled and begin to run at a specified temperature.
About the code:
Everything works except the strobe light function that I wanted to add. Right now the strobe light switch (the small switch) works but I can only get it to turn on and off every second. The plan is to make it possible to adjust the frequency of the strobe light with the potentiometer and display the “Hz” on the display.
Here are the parts you need:
80 mm fan and heatsink:
https://www.aliexpress.com/item/32799938839.html?spm=a2g0s.8937460.0.0.67ed2e0eKrxKWG
or
https://www.aliexpress.com/item/32834284199.html?spm=a2g0s.8937460.0.0.67ed2e0eKrxKWG
or
https://www.aliexpress.com/item/32590832163.html?spm=a2g0s.8937460.0.0.67ed2e0eKrxKWG
100 W LED:
https://www.aliexpress.com/item/33029340248.html?spm=a2g0s.9042311.0.0.64304c4dKFjfne
100 W LED lens:
https://www.aliexpress.com/item/32954482742.html?spm=a2g0o.productlist.0.0.61ad5464CUzY6c&algo_pvid=d5ab664c-2cd0-4576-a59a-e23b1b06b55d&algo_expid=d5ab664c-2cd0-4576-a59a-e23b1b06b55d-0&btsid=0ab6f83a15841971098515398e0a61&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
40 V boost converter:
https://www.aliexpress.com/item/32793476482.html?spm=a2g0s.9042311.0.0.27424c4dMd2TYL
5 V buck converter:
https://www.aliexpress.com/item/32742116421.html?spm=a2g0o.productlist.0.0.718c161a2XqBQz&algo_pvid=32502b19-91d2-4108-856f-78012bc4a60c&algo_expid=32502b19-91d2-4108-856f-78012bc4a60c-0&btsid=0ab6d69515841976131712099e730b&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
Power mosfets:
https://www.aliexpress.com/item/32892361290.html?spm=a2g0s.9042311.0.0.64304c4dKFjfne
Arduino nano:
https://www.aliexpress.com/item/32341832857.html?spm=a2g0s.9042311.0.0.27424c4dlHESQT
Mini OLED display:
https://www.aliexpress.com/item/32896971385.html?spm=a2g0o.productlist.0.0.12d7131d9n7osZ&algo_pvid=de720bfb-d628-4c96-9c00-140b04b61899&algo_expid=de720bfb-d628-4c96-9c00-140b04b61899-0&btsid=0ab6f83915841976745894717e31b2&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
Potentiometer:
https://www.aliexpress.com/item/33040874339.html?spm=a2g0o.productlist.0.0.149a24adegJWp5&algo_pvid=d56b50df-74e2-4cbe-a606-af5ca7d67594&algo_expid=d56b50df-74e2-4cbe-a606-af5ca7d67594-31&btsid=0ab6f81e15841977322257602e47bb&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
10K and 100 K resistors:
https://www.aliexpress.com/item/32687413849.html?spm=a2g0o.productlist.0.0.1b7bff11IohKz4&algo_pvid=6686d1ea-d036-439a-a5f8-cddd215223dc&algo_expid=6686d1ea-d036-439a-a5f8-cddd215223dc-1&btsid=0ab6fa8115841978696782012ef81b&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
100 K thermistor:
https://www.aliexpress.com/item/32812361274.html?spm=a2g0o.productlist.0.0.283943986eGqLf&algo_pvid=1cb77efa-bee0-46dd-92ff-a71c2adbd277&algo_expid=1cb77efa-bee0-46dd-92ff-a71c2adbd277-0&btsid=0be3743615841980081088266e6241&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
Big switch:
https://www.aliexpress.com/item/32985767697.html?spm=a2g0o.productlist.0.0.61ccb7b9SsXKHR&algo_pvid=64a59585-87f7-4098-92d9-722efd68c18b&algo_expid=64a59585-87f7-4098-92d9-722efd68c18b-46&btsid=0ab6f82315841981376463766e66ff&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
Small switch:
https://www.aliexpress.com/item/32778940378.html?spm=a2g0o.productlist.0.0.718e2338ly1Ge9&algo_pvid=013280ad-8063-4889-a2e2-4037781c723f&algo_expid=013280ad-8063-4889-a2e2-4037781c723f-3&btsid=0ab6d67915841982223686031e6e61&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
18 AWG wire:
https://www.aliexpress.com/item/4000009001537.html?spm=a2g0o.productlist.0.0.7578747euDJCzc&algo_pvid=fcfb684d-23f3-441e-a81c-df41a8df471c&algo_expid=fcfb684d-23f3-441e-a81c-df41a8df471c-8&btsid=0ab6f83115841982877926866eab1f&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
18650 batteries:
https://www.aliexpress.com/item/32807032859.html?spm=a2g0o.productlist.0.0.455d670aYLR5XO&algo_pvid=65513c20-85f0-4e33-ab15-b4626ceb0d4b&algo_expid=65513c20-85f0-4e33-ab15-b4626ceb0d4b-0&btsid=0ab6fa8115841984946471977ef76a&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
XT-60 connector:
https://www.aliexpress.com/item/32888533534.html?spm=a2g0o.productlist.0.0.192b4a80tEaJNn&algo_pvid=6af28055-4f01-43ed-b0c3-0d7a1fdb3486&algo_expid=6af28055-4f01-43ed-b0c3-0d7a1fdb3486-2&btsid=0ab6fa8115841985446013169ef7e4&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
18650 BMS:
https://www.aliexpress.com/item/32817897264.html?spm=a2g0s.9042311.0.0.27424c4d9n15Xj
Battery capacity indicator:
https://www.aliexpress.com/item/32947209170.html?spm=a2g0s.9042311.0.0.27424c4dBvBkTY
3S battery charging connector:
https://www.aliexpress.com/item/32639607989.html?spm=a2g0s.9042311.0.0.6dcb4c4dIEehdz
