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MiniPCB2

7 months ago 1583
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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 Manufacturer Part Manufacturer Supplier Supplier Part Price LCSC Assembly Mounted BOM_Manufacturer Part BOM_Supplier BOM_Manufacturer BOM_Supplier Part BOM_Other LCSC
1 A4988, etc. U3,U2 GENERIC STEPPER MOTOR DRIVER CARRIER 2
2 POWER_JACKPTH JP1 POWER_JACK_PTH 1 PJ-102AH Mouser CUI Inc. 490-PJ-102AH
3 FUSE F1 FUSEHOLDER_MINI_BLADE 1 3568 Mouser Keystone 534-3568
4 MOLEX KK 1X2 J1 MOLEX KK 1X2 1 22-23-2021 Mouser Molex 538-22-23-2021
5 5V Reg U4 OKI78SR5/1.5W36C HOR 1 OKI-78SR-5/1.5-W36H-C Mouser Murata 580-OKI78SR51.5W36HC
6 100uF C6,C7 CAP-D8.0XF3.5 2 EEU-FR1H101 Mouser Panasonic 667-EEU-FR1H101 C45674
7 5555165-1 RJS 6P6C 1 5555165-1 Mouser TE Connectivity 5555165-1
8 0.33UF-50V-20%(PTH) C5 CAP-PTH-SMALL-KIT 1 C322C334M5U5TA7301 Mouser KEMET 80-C322C334M5U-TR
9 1x2 Header J6 HDR1X2 1 0.1" Breakaway pin header Generic 0.1" Breakaway pin header
10 TEENSY_3.2_BASIC U1 TEENSY_3.2_BASIC 1 Teensy3.2 no pins PJRC Teensy3.2 no pins
11 3.3KΩ(3302) R2,R3 AXIAL-0.3 2 3.3K Ohm 0.1 watt Generic 3.3K Ohm 0.1 watt
12 4.7KΩ R1 AXIAL-0.3 1 4.7K Ohm 0.1 watt Generic 4.7K Ohm 0.1 watt
13 WEMOS D1 MINI U8 WEMOS_D1_MINI 1 Misc. eBay etc. WeMos D1 Mini Pro
14 1N4001 D5 DO-41 1 1N4001 Generic 1N4001
15 Bussed Resistor Network 5 Pin RP1 4 RESISTOR ARRAY 1 4605X-101-202LF Mouser Bournes 652-4605X-1LF-2K
16 4POS_SCREW_TERMINAL_3.5MM JS1,JS2 4POS_SCREW_TERMINAL_3.5MM 2 1776275-4 Mouser 1776275-4
17 0.1UF-100V-20%(PTH) C3,C1,C8,C10,C9 CAP-PTH-SMALL-KIT 5 SR211C104KARTR1 Mouser 581-SR211C104KARTR1
18 47uF C4,C2 CAP-D5.0XF2.0 2 ECA-1VM470I Mouser Panasonic 667-ECA-1VM470I C13654
19 SJ-3566/3.5MM J2 CUI SJ-3566 1 SJ-3566 Mouser CUI SJ-3566
20 5555164-1 RJ1,RJ2 5555164-1 2 5555164-1 Mouser TE Connectivity 5555164-1
21 PJ-325M/3.5MM J3 AUDIO-PJ325 1 SJ1-3533NG Mouser CUI Inc. SJ1-3533NG
22 2k R4 AXIAL-0.3 1 2K Ohm 0.1 watt Generic 2K Ohm 0.1 watt
23 LED3/5mm D1,D2,D3 LED3/5MM 3 Red 3mm LED Generic Red 3mm LED

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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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