GPL 3.0

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OnStep MiniPCB2 by Howard Dutton.

1 year ago 454
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For my OnStep telescope mount controller (visit my group for more information.) This design is built around the Teensy3.2 and supports the most important features while keeping a small size. There are two stepper drivers (one for RA/Azm and one for Dec/Alt.) There's a power jack, fuse, and power switch connection. Additionally, there's a limit sense input (to stop the mount,) and a PEC sensor input. For connectivity there's a USB Port and support for Wifi using a WeMos D1 Mini Pro. There's also a modular connector for an ST4 guider interface (with optional 5V power.) This model is designed to fit an inexpensive aluminum case (eBay item) and offers easy connections via RJ jacks for the stepper motors and ST4 port and 3.5mm stereo jacks for other connections.


Schematic copy

PCB copy



ID Name Designator Footprint Quantity
1 1k R10 AXIAL-0.3 1
2 47k R20 AXIAL-0.3 1
3 10k R30 AXIAL-0.3 1
4 LED-3MM LED10 LED-3MM/2.54 1
5 M03POLAR JP20,JP40 MOLEX-1X3 2
6 TCST2103 OK10 TCST2103 1
7 GX12-3 J10 GX12-3 1


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