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The finished mod with the heat sink and jiffy box housing the thermostat. The thermostat included a small temperature sensor, which was placed inside the camera next to the CMOS sensor.
The thermostat has been wired up such that the fan operates continuously to dissipate heat. if the temperature as measured by the sensor is above the set point the peltier kicks in and starts cooling the cold finger. once the cold finger comes down to temperature the thermostat turns the peltier off. From memory the controller has a hysteresis of about 0.1 C. I also wired in a small LED in parallel with the peltier, to indicate when the thermostat had turned on the peltier. Foam with an adhesive backing was also placed on the perspex and the exposed parts of the cold finger to improve cooling efficiency by limiting cooling losses.
With the peltier on flat out I can achieve a delta T (ambient to sensor) of about 30C.
Last edited by rmuhlack; 16-12-2014 at 08:24 PM.
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