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

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

 

[Tom Biasi]

<FPD35630@gmail.com> wrote in message
news:c0318063-00c0-4df8-881d-1d804448a324@r29g2000hsg.googlegroups.com...

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

 

[John]

On Wed, 19 Dec 2007 23:19:56 -0800 (PST), FPD35630@gmail.com wrote:

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