I am looking for a 'gizmo' that can monitor temperature, a fan speed, possibly control the fan with PWM, and monitor a digital input. Then output this information via RS232, and accept commands via RS232 to override the fan control if at all possible.
I know I could whip something up via an UNO, but I don't need the USB, and if there is already something out there that would be great.
The 'brains' need to be in a case not much bigger than a deck of cards.
Any help I would appreciate..
Off to Google I go
East Side Jim