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More delays, of the loud spark variety :-/

A project log for Whirlpool fridge controller

Design and production of an efficient PC board for a Whirlpool free-standing fridge using an ATTiny

j3ttblack88J3TTBlack88 03/03/2015 at 23:470 Comments

So I made my boards and wired everything up and... learned that 220VAC live and neutral can be nowhere near each other on protoboard (even if you made sure to remove strips too near each other). Luckily I had decided to use two 5VDC supplies though, so I only blew 2 optocouplers, my control board is still OK.

I am now waiting for a separate 5VDC actuated 220VAC relay board by SainSmart which I can then theoretically just wire to my control board.

Regarding my control board, I am using an ATtiny85 to maintain 3degC using a DS18820 oneWire temperature sensor. I have 2 pins actuating the fan and compressor relays. Another attached to a speaker and LED for the open door alarm and finally an input pin that I plan to sense the door's state (when the door is open, a 220VAC switch is closed turning on the light).

I should be getting the relays tomorrow, so will hopefully finish this build soon.

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