Howard's original comment:
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 ESP32S micro-controller onboard runs the smart hand controller firmware (from OnStep's /src/addons/St4Serial directory.)
On earlier versions 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.
This version is a respin of a design that has had many builds.
v2.01jp - converted the Teensy footprint design to use a ESP32S VROOM module after extended conversations with Howard (the designer of the OnStep and the original Teensy based SHC). Removed the mounting holes for the smaller displays (I am using the 2.4" for all my SHCs... Sorry if this is a problem for you but as you age you will thank me!) The mounnting holes for this board line up with the previous Teensy boards, it might not line up with earlier ESP boards designed by other people. v2.02jp - This version adds a 5-way switch in place of the center shift button. There are also some other minor part movements. v2.03jp - Added a step up converter for the 5V power supply to correct a problem that the ESP chip is extremely sensitive to low voltages.
Testing comments: I have built and tested this version, it appears to work fine.
|6||2.54mm 1*5P Header||P2||HDR-TH_5P-P2.54-V||1|
|9||Bussed Resistor Network 8/9 Pin||RN1||RES-ARRAY-TH_9PIN-L22.82-W3.00-PITCH2.54||1|
|12||ESP32 NODEMCU 32S||U1||ESP32 NODEMCU-32S NENAD FORKO||1|