Fridge Controller Construction

A lot of the photographs have been lost and these are those which I've found from various sources since. As time goes by I'll add them as they are found.

The circuit of the new controller mocked up on breadboard for testing, all the elements on show.

All the elements mounted into a small plastic box. The rotary control and display were mounted on the lid, the buck power supply is under the relay board.

Original test mounting of the internal fan and lower thermometer inside the fridge. The upper thermometer is just behind the internal light in the upper right corner of the picture. Once tested and working, the white tape was replaced by electrical conduit.

This is the inside of the light and thermostat casing mounted inside the fridge. This would be replaced and a new plug fitted to support the internal light as well as the new thermometers with power supply.

View of the completed controller in place showing screen and rotary switch. Also shown is a potentiometer used for varying the motor speed and a push button connected to the microcontroller reset line. 

Again, the completed controller installed for testing. All the leads from the fridge were connected back to screw blocks next to the controller via a multiway cable. This was actually a cable designed for powering a tow hitch so had a mix of cable sizes, some designed for running caravan fridges so were suitable for power. -The black box to the left of the controller is a fan speed controller which was used to experiment with fan speeds for the internal and external fans. The black box to the right is a legacy relay for switching the fridge off/on remotely.