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GPL 3.0

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MiniPCB2

11 months ago 2111
  • Description
  • Documents
  • BOM
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Description

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.

Documents

Schematic

PCB

BOM

ID Name Designator Footprint Quantity
1 A4988, etc. U3,U2 GENERIC STEPPER MOTOR DRIVER CARRIER 2
2 POWER_JACKPTH JP1 POWER_JACK_PTH 1
3 FUSE F1 FUSEHOLDER_MINI_BLADE 1
4 MOLEX KK 1X2 J1 MOLEX KK 1X2 1
5 5V Reg U4 OKI78SR5/1.5W36C HOR 1
6 100uF C6,C7 CAP-D8.0XF3.5 2
7 5555165-1 RJS 6P6C 1
8 0.33UF-50V-20%(PTH) C5 CAP-PTH-SMALL-KIT 1
9 1x2 Header J6 HDR1X2 1
10 TEENSY_3.2_BASIC U1 TEENSY_3.2_BASIC 1
11 3.3KΩ(3302) R2,R3 AXIAL-0.3 2
12 4.7KΩ R1 AXIAL-0.3 1
13 WEMOS D1 MINI U8 WEMOS_D1_MINI 1
14 1N4001 D5 DO-41 1
15 Bussed Resistor Network 5 Pin RP1 4 RESISTOR ARRAY 1
16 4POS_SCREW_TERMINAL_3.5MM JS1,JS2 4POS_SCREW_TERMINAL_3.5MM 2
17 0.1UF-100V-20%(PTH) C3,C1,C8,C10,C9 CAP-PTH-SMALL-KIT 5
18 47uF C4,C2 CAP-D5.0XF2.0 2
19 SJ-3566/3.5MM J2 CUI SJ-3566 1
20 5555164-1 RJ1,RJ2 5555164-1 2
21 PJ-325M/3.5MM J3 AUDIO-PJ325 1
22 2k R4 AXIAL-0.3 1
23 LED3/5mm D1,D2,D3 LED3/5MM 3

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Comments (2)

Moos Reply

Hi Howard,
great new revision. I'm working with the previous revision 1.275 but here are still some small mistakes.
I have some small suggestions for the next revision. Thanks for OnStep.
Schaltplan-REV-2.0.changes.png

hdutton Reply

@Moos


I fixed the schematic date and exchanged the screw terminal part positions.  Thank you.


RP1 will continue to use 3.3V

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