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OnStep ESP32 SHC 5V Joystick

3 months ago 76
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Description

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.

Documents

Schematic copy copy copy

PCB copy copy copy

BOM

ID Name Designator Footprint Quantity
1 1000uF C1 CAP-D8.0XF3.5 1
2 470uF C2 CAP-D8.0XF3.5 1
3 LED3/5mm D1 LED3/5MM 1
4 Header-Male-2.54_1x3 H1 HDR-TH_3P-P2.54-V 1
5 5Volt Regulator H2 HDR-TH_3P-P2.54-V 1
6 2.54mm 1*5P Header P2 HDR-TH_5P-P2.54-V 1
7 470 R1 AXIAL-0.3 1
8 TO ONSTEP RJ2 6P6C 1
9 Bussed Resistor Network 8/9 Pin RN1 RES-ARRAY-TH_9PIN-L22.82-W3.00-PITCH2.54 1
10 12X12X7.3 SW1,SW2,SW3,SW4,SW6,SW7 SW-TH_4P-L12.0-W12.0-P5.00-LS12.5 6
11 K1-1506DN-01 SW8 SW-TH_K1-1506DN-01 1
12 ESP32 NODEMCU 32S U1 ESP32 NODEMCU-32S NENAD FORKO 1
13 MTS_CYT1076 U2 MTS_CYT1076 1
14 AMS1117 U11 AMS1117 1

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