Difference between revisions of "Usb human heater"
(Created page with "{{Project |ProjectStatus=Planning |ProjectNiche=Electronics |ProjectPurpose=Fun }} After seeing the [http://wristifyme.com/ latest] in hipsterly-wanky-named products, and suff...") |
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| − | |ProjectStatus= | + | |ProjectStatus=Dead |
|ProjectNiche=Electronics | |ProjectNiche=Electronics | ||
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| − | + | = Research = | |
from [http://syneurgy.com/images/Downloads/Reference-9.pdf] | from [http://syneurgy.com/images/Downloads/Reference-9.pdf] | ||
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increases by 0.8oC for each 10 mW/cm2 of absorbed | increases by 0.8oC for each 10 mW/cm2 of absorbed | ||
power. | power. | ||
| + | |||
| + | = Materials = | ||
| + | |||
| + | http://www.conrad.nl/ce/nl/product/429066/Weerstandsdraad-63-m-5-m | ||
| + | http://www.conrad.nl/ce/nl/product/429023/Weerstandsdraad-10-m5-m | ||
| + | |||
| + | = Heating Element = | ||
| + | |||
| + | P = VI<br> | ||
| + | V = IR | ||
| + | |||
| + | == 65ohm/m == | ||
| + | |||
| + | Voltage: 5V<br> | ||
| + | Resistance: 65ohm<br> | ||
| + | Current: ?<br> | ||
| + | |||
| + | Length = 0.5m<br> | ||
| + | Current = 5/32.5 = 0.156A<br> | ||
| + | Power = 5 * 0.156 = 0.78W<br> | ||
| + | |||
| + | == 10ohm/m == | ||
| + | |||
| + | Voltage: 5V<br> | ||
| + | Resistance: 10ohm<br> | ||
| + | Current: ?<br> | ||
| + | |||
| + | Length = 1.5m<br> | ||
| + | Current = 5/15 = 0.333A<br> | ||
| + | Power = 5 * 0.333 = 1.665W<br> | ||
| + | |||
| + | Length = 2m<br> | ||
| + | Current = 5/20 = 0.25A<br> | ||
| + | Power = 5 * 0.25 = 1.255W<br> | ||
Latest revision as of 16:23, 17 August 2016
| Projects | |
|---|---|
| Participants | Amx109 |
| Skills | |
| Status | Dead |
| Niche | Electronics |
| Purpose | Fun |
After seeing the latest in hipsterly-wanky-named products, and suffering from cold hands all the time, i thought - why not build my own.
this is an attempt
Research
from [1]
In other words, on average the skin absorbs about 80 mW/cm2 to reach 41oC. In addition, skin temperature increases by 0.8oC for each 10 mW/cm2 of absorbed power.
Materials
http://www.conrad.nl/ce/nl/product/429066/Weerstandsdraad-63-m-5-m http://www.conrad.nl/ce/nl/product/429023/Weerstandsdraad-10-m5-m
Heating Element
P = VI
V = IR
65ohm/m
Voltage: 5V
Resistance: 65ohm
Current: ?
Length = 0.5m
Current = 5/32.5 = 0.156A
Power = 5 * 0.156 = 0.78W
10ohm/m
Voltage: 5V
Resistance: 10ohm
Current: ?
Length = 1.5m
Current = 5/15 = 0.333A
Power = 5 * 0.333 = 1.665W
Length = 2m
Current = 5/20 = 0.25A
Power = 5 * 0.25 = 1.255W
