Optical Bedlevel sensor for K8200/3Drag

There are several types of bedlevel sensors around. With the K8200 or 3Drag you are constantly running out of I/O-Ports and so some of those sensors are a real challenge (e.g. those with servos).

Furthermore I did not want to install more wires and thought, the three available should be sufficient.

So, here is a optical bedlevel sensor, based on IR reflection. It includes a microcontroller to make the measurements based on IR pulses and eliminate environmental IR (e.g. the heated heatbed). And still the microcontroller does have ports free. One input port is unused and two I/O ports, which could be used as I2C bus. Plus the controller does have plenty of space, RAM and EEPROM unused. Plenty of room for your imagination, what to do with that.

Be careful with the connector to the controller board. The 3Drag/K8200 does have plus on the middle pin and needs a bridge to get 5V there. RAMPS boards have two different setups. Please verify, before connecting.

The holder for the IR