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For my OnStep telescope mount controller (visit my group for more information.) This design is built around the Teensy3.5/3.6 There are four stepper drivers (one for RA/Azm, one for Dec/Alt, one for a focuser, and one for a rotator/second focuser.) All are available on RJ jacks at the PCB back. There's a power jack, fuse, and power switch connection. There are several connectivity options: USB, an I2C port (w/footprint for the DS3231 RTC.) There are two serial ports. Serial4 is brought out on a pin-header connector (w/power.) Serial1 is on a WeMos D1 Mini (ESP8266) foot-print for Wifi support. There is a D-Sub connector DB9 that has home SW inputs, PEC input, and two channels of A/B encoder inputs (which run to the ESP8266.) There's also a modular connector for an ST4 guider interface (with optional 5V power.) One a 3.5mm stereo mini jack is a limit sense input (to stop the mount) and also a reticule LED output. And finally, there's a mini speaker output for an alert buzzer.

History Version 2.0 First release of MaxPCB2 Version 2.1 Moved PPS from DS3231 on 32KHZ to SQW pin





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
1 A4988, etc. U4,U3,U2,U5 GENERIC STEPPER MOTOR DRIVER CARRIER 4 Misc. eBay etc.
3 FUSE F1 FUSEHOLDER_MINI_BLADE 1 3568 Mouser Keystone 534-3568
4 5V Reg U7 OKI78SR 1 OKI-78SR-5 1.5-W36-C Mouser Murata 580-OKI78SR5/1.5W36C
5 100uF C2,C1 CAP-D8.0XF3.5 2 EEU-FR1H101 Mouser Panasonic 667-EEU-FR1H101
6 100uF C3 CAP-D6.3XF2.5 1 UVY1E101MDD Mouser Nichicon 647-UVY1E101MDD
7 RJ12 RJS 6P6C 1 5520470-3 Mouser TE Connectivity 5520470-3
8 0.33UF-50V C8 CAP-PTH-SMALL-KIT 1 C322C334M5U5TA7301 Mouser KEMET 80-C322C334M5U-TR
9 0.1UF-100V C9,C11,C13,C12,C6,C7 CAP-PTH-SMALL-KIT 6 SR211C104KARTR1 Mouser 581-SR211C104KARTR1
10 1x2 Header J12 HDR1X2 1 0.1" Breakaway Pin Header Misc. 0.1" Breakaway Pin Header
11 12V Reg U6 OKI78SR 1 L7812ABV Mouser STMicroelectronics 511-L7812ABV
12 WEMOS D1 MINI U8 WEMOS_D1_MINI 1 Misc. eBay etc.
13 Bussed Resistor Network 5 Pin RP1,RP2 4 RESISTOR ARRAY 2 4605X-101-202LF Mouser Bournes 652-4605X-1LF-2K
14 1x3 Header J10,J9 1X3 HEADER 2 2 0.1" Breakaway Pin Header Misc. 0.1" Breakaway Pin Header
15 1N4001 D5,D4 DO-41 2 1N4001 LCSC Generic 1N4001
16 DB9 Socket JP2 DB9 1 D09S33E4GV00LF Mouser Amphenol FCI 649-D09S33E4GV00LF
17 BUZZER SP1 BUZZER-12MM-KIT 1 CEM-1203 Mouser CUI Inc. 490-CEM-1203(42)
18 4.7KΩ R1 AXIAL-0.3 1 4.7K Ohm 0.1 Watt Generic 4.7K Ohm 0.1 Watt
19 3.3KΩ(3302) R2,R3 AXIAL-0.3 2 3.3K Ohm 0.1 Watt Generic 3.3K Ohm 0.1 Watt
20 180Ω R5 AXIAL-0.4 1 180 Ohm 1/4 watt Generic 180 Ohm 1/4 watt
21 DS3231-RTC RTC1 DS3231-RTC-24C32-EEPROM 1 Misc. eBay etc.
22 5520426-4 RJ2,RJ1 5520426-4 2 5520426-4 Mouser TE Connectivity 5520426-4
23 RJ22 RJ3,RJ4 5555980-1 2 5555980-1 Mouser Te Connectivity 571-5555980-1
24 M0 J3,J6 1X3 HEADER 2 2 0.1" Breakaway Pin Header Misc. 0.1" Breakaway Pin Header
25 M1 J4,J7 1X3 HEADER 2 2 0.1" Breakaway Pin Header Misc. 0.1" Breakaway Pin Header
26 M2 J5,J8 1X3 HEADER 2 2 0.1" Breakaway Pin Header Misc. 0.1" Breakaway Pin Header
27 47uF C5,C4 CAP-D5.0XF2.0 2 ECA-1VM470I Mouser Panasonic 667-ECA-1VM470I
28 4POS_SCREW_TERMINAL_3.5MM JS1,JS2 4POS_SCREW_TERMINAL_3.5MM 2 1776275-4 Mouser 1776275-4
29 4POS_SCREW_TERMINAL_2.54MM JS3,JS4 4POS_SCREW_TERMINAL_2.54MM 2 282834-4 Mouser TE Connectivity 571-282834-4
31 MOLEX KK 1X2 J1 MOLEX KK 1X2 1 22-23-2021 Mouser Molex 538-22-23-2021
32 1x5 Header J13 1X5 HEADER 1 0.1" Breakaway Pin Header 0.1" Breakaway Pin Header
33 LED3/5mm D1,D2,D3 LED3/5MM 3 3mm LED Red Generic 3mm LED Red
34 PJ-325M/3.5MM J2 AUDIO-PJ325 1 SJ1-3533NG Mouser CUI Inc. SJ1-3533NG
35 0.1UF-100V-20%(PTH) C14 CAP-PTH-SMALL-KIT 1 SR211C104KARTR1 Mouser 581-SR211C104KARTR1
36 2k R6 AXIAL-0.3 1 2K Ohm 0.1 Watt Generic 2K Ohm 0.1 Watt




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