Webcam Cooler Fan Controller


I have two outside webcams which need to be monitored for excessive temperatures in the summer (we see temperatures over 100F in the summer), particularly being housed in a low profile dome. The dome is necessary to protect the camera from the outside elements.
Why not just stick a fan in with it? Yes, but if it runs all the time, dust becomes a problem and, if the fan can't keep the temperature within a certain range (<110F) the camera would be damaged.

Solution: A PICAXE18x with three ADC readings, one for the actual temperature inside the dome, one to set fan turn-on temperature, and one to set high level to turn off the camera until the temperature drops to a reasonable level. The camera and fan are both controlled by relays.  The cameras are Trendnet
TV-IP422, and TV-IP110 respectively.  The 422 on the left is wireless.  Note the white antenna.  It is a pan/tilt camera.  Note the control panel in the picture on the left below. The camera on the right also views a small black box with a lite LED.  There are two leds that flash at different rates telling me my alarm system and irragation systems are working, or what condition exists with them.  Pretty neat!


I have an LCD screen hooked up temperately until I know what the right settings are. Once established, I will disconnect if for other projects.  There is also a temporary thermometer hooked up to both to adjust the settings.  Once completed, they will not be needed.  There are three LEDs indicating 'camera on', 'fan on', and the center yellow flashes to indicate the program is running properly.  There are two potentiometers to adjust the settings for fan on, and high temperature camera off.        

I had several "cockpit" problems initially-noisy 5v, relay bounce, etc., but everything seems to be working. I will begin construction of a second unit for another webcam I have outside.

But, they are both installed and working.  Now I just need to wait for the heat to see if they operate as planned!  The schematic for the units is here.  For the program code, go here.












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