Difference between revisions of "Usb human heater"

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Line 8: Line 8:
 
this is an attempt
 
this is an attempt
  
 
+
= Research =
 
from [http://syneurgy.com/images/Downloads/Reference-9.pdf]
 
from [http://syneurgy.com/images/Downloads/Reference-9.pdf]
  
Line 16: Line 16:
 
power.
 
power.
  
Materials:
+
= Materials =
  
 
http://www.conrad.nl/ce/nl/product/429066/Weerstandsdraad-63-m-5-m
 
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 = 0.78
 +
 +
== 10ohm/m ==
 +
 +
Voltage: 5V
 +
Resistance: 10ohm
 +
Current: ?
 +
 +
Length = 1.5m
 +
Current = 5/15 = 0.333A
 +
Power = 5 * 0.333 = 1.665

Revision as of 21:14, 10 January 2014

Projects
Participants Amx109
Skills
Status Planning
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 = 0.78

10ohm/m

Voltage: 5V Resistance: 10ohm Current: ?

Length = 1.5m Current = 5/15 = 0.333A Power = 5 * 0.333 = 1.665