This hand controller with OLED display plugs into OnStep's ST4 port and is able to fully operate an OnStep (Alpha branch) telescope controller. The Teensy3.2 micro-controller onboard runs the smart hand controller firmware (from OnStep's /src/addons/St4Serial directory.) This is a preliminary design but basic testing has been done. There was a problem with the display connection on the PCB but this should be fixed. *Still be careful to verify the schematic and PCB and your exact display to be sure the connections are correct.* Revision History 1.10 - corrected position/labels on VCC and Gnd pins of display connector 1.11 - added map light LED 1.12 - added display reset connection (for SSD1309, etc.)