Figured out how to get the metal draws out of the new tool chest making it light enough I could get it up the stairs without permanent damage to either of us. With my Surface Plate on top, this thing is not going anywhere.

Got the push-button to turn the fan on & off. The push-button input is on a different Raspberry PI GPIO (General Purpose Input/Output) pin. The fan control is now one of the PWM channels on the 16-channel PWM HAT instead of a GPIO pin. With this change, the fan board can be easily plugged into an existing, unused HAT connection. This also opens the option of variable speed to the fan control. Monitoring CPU temperature and clock frequency are also working. Now to make it less clunky and add LED display.

Used the mill to make metal chips. Lots to learn.