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12 volt thermostat (button? type) for solar window heater project

I am looking for a thermostat to turn on/off a small 12 volt fan on a
homemade window solar heater. I think they are called "button" type.
it needs to turn on at 68-80 and off at 67. Can anyone tell me the
proper name of what I am looking for and/or where to find one? Thanks
 
T

Tom Biasi

Jan 1, 1970
0
I am looking for a thermostat to turn on/off a small 12 volt fan on a
homemade window solar heater. I think they are called "button" type.
it needs to turn on at 68-80 and off at 67. Can anyone tell me the
proper name of what I am looking for and/or where to find one? Thanks

Try "Thermoswitch" or Thermal Switch" The 67 off 68 on might be a little
hard to do.

Tom
 
J

John

Jan 1, 1970
0
I am looking for a thermostat to turn on/off a small 12 volt fan on a
homemade window solar heater. I think they are called "button" type.
it needs to turn on at 68-80 and off at 67. Can anyone tell me the
proper name of what I am looking for and/or where to find one? Thanks

You would have a better chance of success if you used a simple PICAXE
microprocessor (http://www.picaxe.co.uk/) and a temperature sensor
such as the DS18B20. The DS18B20 can detect a change of 1 degree or
less.

I use a PICAXE and a DS18B20 to control a small fan in an audio/video
cabinet: http://www.picaxe.us/AV-fan.html

The PICAXE 08M chip is about $3.50, the DS18B20 is about $4.50. You
need either a breadboard or a prototype board for building the circuit
(either is under $5). You need either a transistor or a relay to
control the fan (under $3 each). So about $20 for a +/- 1 degree
control circuit.

The software to program the PICAXE is a free download from
http://www.picaxe.co.uk/

There's a VERY active support forum at http://www.picaxeforum.co.uk/

John
 

neon

Oct 21, 2006
1,325
Joined
Oct 21, 2006
Messages
1,325
turn on 68-80 and off at 67 . this does not make sense let it run continiously and a small fan cannot provide any temperature control not unless the area is small very small. a small fan 6" at 1500w will take the better part of 4 hours to raise the temperature of a 12x12' 10 degrees.
 
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