Heating Boots
Intro: Heating Boots
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 :)
STEP 1: I Used:
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:
STEP 2: Nichrome Wire.
I cut 65 cm of nichrome wire. It takes 5V, 0.7A for one foot. Insoles warm up to +49°С.
STEP 3: USB-cable
I tested some USB-cables, but they could transfer only 0.5A unfortunately. And I made my own.
STEP 4: Soles + Wire + USB-Cable
I sewed the wire and USB-cable to insoles. Nichrome wire couldn't solder, so i used needle with thread.
STEP 5: Batteries
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.
STEP 6: Temperature Test
I got 21°C (without nichrome wire) and 49°C (with). Cool!
STEP 7: Put Inside
STEP 8: Strap
I sewed straps using 40mm rubber and velcro.
STEP 9: Results
Hid under jeans :)
STEP 10: Conclusion
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 ;)
62 Comments
themelispan 3 years ago
Killmyfeel 3 years ago
Galpinus 5 years ago
BTW, where did you get that The nichrome wire "eat" 0.7A ?
thank you
KISELIN 4 years ago
Killmyfeel 5 years ago
I connected 65cm of nichrome wire (0.4mm) to battery and measured amps using my multimeter
smokebox 5 years ago
Americans have become even more insular since then. It is now mostly American women who graduate from American colleges. I am glad that Finns are still interested in other languages!
Killmyfeel 5 years ago
It's interesting to know somethings about Americans :)
But I'm not from Finland, I'm from Russian (Saint Petersburg). We celebrated New Year in Helsinki.
And nichrome wire is standard element in many heating things.
smokebox 5 years ago
KISELIN 4 years ago
So, 1Amp @ 3,7V= 3,7W, that I guess would warm up your fingers (toes) pretty comfortable.
To those saying the LiPo to explode? That would require ashortage directly on the poles of the battery, NOT the nic.wire.
Killmyfeel 5 years ago
GeedieZ 5 years ago
MillerI 5 years ago
KISELIN 4 years ago
Killmyfeel 5 years ago
Lee Wilkerson 5 years ago
Lee Wilkerson 5 years ago
Thank you very much from me and my cold feet.
MillerI 5 years ago
Try using a USB-C cable. They are spec'd and designed to handle the higher loads. Just got a new Chromebook and it wouldn't mobile charge rapidly on regular USB adapters. Got the USB-C adapter and cable and now getting 2.2A charge!
Cheers!
Killmyfeel 5 years ago
But I don't need more then 0.7...1.0A :)
MillerI 5 years ago
jackreno11 5 years ago
It's cool to see some other creators using AliExpress, I feel like it's really overlooked for the kind of deals it has. Especially using the power banks. I've got a few projects in the works using the same parts!