A common component used on walk-in coolers, freezers, and other refrigeration equipment is the liquid line solenoid. It is a fluid control device that is used to stop the flow of refrigerant to an ...

While we’re well into the age of 3.3V logic, there are still an incredible number of boards and hardware that still operate using 5V logic. Over on the Hackaday.io stack, [Radomir] is ...