Heating Boots
![готово 2.jpg](/proxy/?url=https://content.instructables.com/F1F/GGPP/JRKZ4U21/F1FGGPPJRKZ4U21.jpg&filename=готово 2.jpg)
![I Made Electric Heated Boots Insoles For Girlfriend (DIY)](/proxy/?url=https://content.instructables.com/FZH/JSWD/JRKZ4XHI/FZHJSWDJRKZ4XHI.jpg&filename=I Made Electric Heated Boots Insoles For Girlfriend (DIY))
My girlfriend often waits for a bus during 20-30 minutes. There is -5°C...-20°C sometimes. And today I want to show you my solution.
In the video you can see the test of this boots in beautiful New Year Helsinki.
Pleasant viewing :)
I Used:
![IMG_3300.JPG](/proxy/?url=https://content.instructables.com/FM8/N5E9/JRKZ3BTU/FM8N5E9JRKZ3BTU.jpg&filename=IMG_3300.JPG)
1) Wool Insoles like this:
http://s.click.aliexpress.com/e/ccScfELQ
2) Heating Nichrome Wire. I used 0.4mm:
http://s.click.aliexpress.com/e/jL1nvwo
3) Batteries Li-ion 18650:
http://s.click.aliexpress.com/e/bnXXyPtQ
4) Power Bank Case (5V, 1A):
http://s.click.aliexpress.com/e/zRJrt9q
5) Hand made USB powered cable for 5V, 1A.
6) Sewing Elastic Rubber 40mm:
Nichrome Wire.
![IMG_3299.JPG](/proxy/?url=https://content.instructables.com/FKG/F2WK/JRKZ3BQI/FKGF2WKJRKZ3BQI.jpg&filename=IMG_3299.JPG)
![IMG_3304.JPG](/proxy/?url=https://content.instructables.com/FJX/0GF3/JRKZ3C94/FJX0GF3JRKZ3C94.jpg&filename=IMG_3304.JPG)
![IMG_20190202_213932.jpg](/proxy/?url=https://content.instructables.com/FQ4/9VZ1/JRKZ4GKQ/FQ49VZ1JRKZ4GKQ.jpg&filename=IMG_20190202_213932.jpg)
I cut 65 cm of nichrome wire. It takes 5V, 0.7A for one foot. Insoles warm up to +49°С.
USB-cable
![IMG_3307.JPG](/proxy/?url=https://content.instructables.com/FJL/RTFT/JRKZ3CKP/FJLRTFTJRKZ3CKP.jpg&filename=IMG_3307.JPG)
I tested some USB-cables, but they could transfer only 0.5A unfortunately. And I made my own.
Soles + Wire + USB-Cable
![IMG_3313.JPG](/proxy/?url=https://content.instructables.com/FLI/4ZCP/JRKZ3D7D/FLI4ZCPJRKZ3D7D.jpg&filename=IMG_3313.JPG)
![IMG_3312.JPG](/proxy/?url=https://content.instructables.com/FV4/GQGH/JRKZ3D45/FV4GQGHJRKZ3D45.jpg&filename=IMG_3312.JPG)
![IMG_3416.JPG](/proxy/?url=https://content.instructables.com/FP0/HFDN/JRKZ3QCB/FP0HFDNJRKZ3QCB.jpg&filename=IMG_3416.JPG)
I sewed the wire and USB-cable to insoles. Nichrome wire couldn't solder, so i used needle with thread.
Batteries
![IMG_3302.JPG](/proxy/?url=https://content.instructables.com/FTK/4Z58/JRKZ3WWL/FTK4Z58JRKZ3WWL.jpg&filename=IMG_3302.JPG)
![IMG_3303.JPG](/proxy/?url=https://content.instructables.com/FNO/E021/JRKZ3X3U/FNOE021JRKZ3X3U.jpg&filename=IMG_3303.JPG)
I used new li-ion batteries 18650. I tested it's capacity = 3400mAh! It's great :)
Let's calculate battery live time.
Battery has 3.7v and 3400 mAh, but Power Bank voltage transformer gives 5V.
So battery into case should has capacity: 3.7*3400/5 = 2516 mAh.
The nichrome wire "eat" 0.7A, so battery live time: 2516/700 = 3,6 hours. Voltage transformer efficiency, I think, 90%, so we have 3,6*0,9 = 3,24 hours.
It's about 3:15.
Will check it latter.
Temperature Test
![IMG_3419.JPG](/proxy/?url=https://content.instructables.com/F6R/5U84/JRKZ3VXS/F6R5U84JRKZ3VXS.jpg&filename=IMG_3419.JPG)
![IMG_3417.JPG](/proxy/?url=https://content.instructables.com/F44/ZDM2/JRKZ3VTQ/F44ZDM2JRKZ3VTQ.jpg&filename=IMG_3417.JPG)
I got 21°C (without nichrome wire) and 49°C (with). Cool!
Put Inside
![IMG_3512.JPG](/proxy/?url=https://content.instructables.com/FEV/O6D1/JRKZ3ECD/FEVO6D1JRKZ3ECD.jpg&filename=IMG_3512.JPG)
![IMG_3511.JPG](/proxy/?url=https://content.instructables.com/F9W/89UF/JRKZ3E9U/F9W89UFJRKZ3E9U.jpg&filename=IMG_3511.JPG)
Strap
![IMG_3506.JPG](/proxy/?url=https://content.instructables.com/F8V/RUIP/JRKZ3DZ0/F8VRUIPJRKZ3DZ0.jpg&filename=IMG_3506.JPG)
![IMG_3507.JPG](/proxy/?url=https://content.instructables.com/F0U/EEPL/JRKZ3DZQ/F0UEEPLJRKZ3DZQ.jpg&filename=IMG_3507.JPG)
![IMG_3502.JPG](/proxy/?url=https://content.instructables.com/FAT/R9CC/JRKZ3DO8/FATR9CCJRKZ3DO8.jpg&filename=IMG_3502.JPG)
I sewed straps using 40mm rubber and velcro.
Results
![IMG_4558.JPG](/proxy/?url=https://content.instructables.com/FKU/F6HQ/JRKZ4J2G/FKUF6HQJRKZ4J2G.jpg&filename=IMG_4558.JPG)
![IMG_4559.JPG](/proxy/?url=https://content.instructables.com/FME/MRU4/JRKZ4J4B/FMEMRU4JRKZ4J4B.jpg&filename=IMG_4559.JPG)
Hid under jeans :)
Conclusion
![IMG_4576.JPG](/proxy/?url=https://content.instructables.com/FR7/DJUD/JRKZ4M86/FR7DJUDJRKZ4M86.jpg&filename=IMG_4576.JPG)
![IMG_4539.JPG](/proxy/?url=https://content.instructables.com/FWK/PA3R/JRKZ4LZY/FWKPA3RJRKZ4LZY.jpg&filename=IMG_4539.JPG)
![tl.gif](/proxy/?url=https://content.instructables.com/F5Z/7ESC/JSCG3LII/F5Z7ESCJSCG3LII.gif&filename=tl.gif)
We tested heated boots in Helsinki on the New Year holiday. It is a beautiful city! But it was so windy.
We were walking about 8 hours every day. And these boots were saving Masha.
Masha is happy. Me too :)
Live test showed they are great boots, don't causes discomfort. Live time about 2-3 hours. We didn't check the exact time.
But USB contact was bad. I want to change it to other connector type.
PS: Sorry for my bad English, I am still learning. You can correct me (please).
PSS: It's my first instruction, so I will be happy to read your opinions ;)