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Astro Projects

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Posted (edited)

Circuit Diagrams :-

Cooling :-  The Peltier TEC is run continuously on a low level at about 5v to stop the camera overheating in the thermal insulation.  For night viewing, the TEC is run from the full supply of 13.8v switched by a GPIO pin on the RPi.  The J438 P-channel MOSFET is turned on via the EL8217 opto-coupler providing the full supply voltage to the TEC.

Camera Cooler Control Circuit 01.png

Dew Heater control :- In this case the dew heater is connected directly to the main supply and the return is switched by an N-channel MOSFET (IRLZ44N) to control it.  Again the power circuits are isolated from the delicate RPi data side with an opto-isolator.

Dew Heater Circuit 03.png

Edited by Gina

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