Heat Socks Controller

thingiverse

I'm constantly let down by the heated socks I've bought, so I decided to create my own controlled by an Arduino and powered by 2-4S Lipo batteries. The cheap socks I'm using are from eBay, and my plan is to keep the battery and control unit in a hidden pocket of my jacket with cables leading directly to each sock. Sure, there are some downsides to having cables running through my pants, but the benefits far outweigh them. My control unit has a momentary flip-switch that goes ON-OFF-ON, along with several LEDs that indicate if it's powered on, the level of power output, and battery status. An N-level MOSFET handles the power output, and if it gets too hot, the lid can be made of 2mm aluminum to act as a heat sink. During testing, I realized that more than 25W is burning up my feet, so that's the limit for fully charged 3- & 4S batteries. Code and schematics can be found here: https://www.tinkercad.com/things/j0S4ZQJT6rA. Note that Tinkercad only has an Arduino UNO, but I'm using a Pro Micro in this project. The only difference in the code is the buzzer pin. Just uncomment or comment relevant lines at the beginning of the code for the buzzer pin. Here are the parts you'll need: 8 flat LEDs (5x2mm) 8 suitable resistors for the LEDs (I use 150 ohms) 1 N-level MOSFET (I'm using an FQP30N06L) 1 resistor between the Gate and Source of the MOSFET (10k ohms) 1 resistor between the digital pin and Gate of the MOSFET 2 resistors for a voltage divider (750 and 2k ohms) 1 Arduino Pro Micro (Sparkfun or clone) 1 Polulu 5V 500mA buck regulator 1 5V buzzer 1 momentary flip switch ON-OFF-ON 1 resistor for the switch (200 ohms) 1 pair of cheap heated socks (I got mine on eBay for ~10 USD) Note that the schematics and code on Tinkercad are default for an Arduino UNO. Make sure to uncomment or comment which pin to use for the buzzer before uploading it to your Pro Micro board. Check out this video: https://www.youtube.com/watch?v=rGiSJeWuVHw And here's the link again for the schematics and code: https://www.tinkercad.com/things/j0S4ZQJT6rA. Enjoy! Edit 190129: I added a version with one larger hole for cables instead of two small ones.