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GPL 3.0

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MaxESP2 (obsolete)

1 year ago 1827
  • 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 ESP32S.

Features:

  • Three stepper drivers (one for RA/Azm, one for Dec/Alt, and one for a focuser or rotator.)
  • Power jack, fuse, and power switch connection.
  • DB9 (d-sub miniature) jack for quick connection of optional optical encoders, home position switches, and the PEC sensor.
  • Limit Sense input to stop the mount (panic button, switches on the mount, etc.)

Connectivity options:

  • USB
  • Bluetooth (onboard the ESP32.)
  • Wifi support via the WeMos D1 Mini (ESP8266) which can plug directly into the PCB (using 0.1" socket headers.) Encoders are supported through the WeMos D1 Mini and brought out on the DB9 connector.
  • I2C support so the DS3231 (RTC) can plug directly in the PCB. The BME280 (weather sensors) can potentially be attached outside on the DB9 connector depending on settings.
  • ST4 port auto-guider interface (with optional 5V power.)

Revisions: 2.0 Initial Release 2.1 Disconnected SLP/RST on Axis1/2 so ESP32 GPIO12 is not held HIGH during boot 2.2 Added +5V to USB connector going to ESP32 (otherwise USB on some of these doesn't work.) Added S310FA Diode to protect TMC2xxx stepper drivers due to above requirement.

Documents

PCB

Schematic

BOM

ID Name Designator Footprint Quantity BOM_Manufacturer Part
1 A4988, etc. U4,U3,U2 GENERIC STEPPER MOTOR DRIVER CARRIER 3 Misc. eBay etc.
2 POWER_JACKPTH JP1 POWER_JACK_PTH 1 PJ-102AH
3 FUSE F1 FUSEHOLDER_MINI_BLADE 1 3568
4 5V Reg U7 OKI78SR 1 OKI-78SR-5 1.5-W36-C
5 100uF C2,C1 CAP-D8.0XF3.5 2 EEU-FR1H101
6 100uF C3 CAP-D6.3XF2.5 1 UVY1E101MDD
7 RJ12 RJS 6P6C 1 5520470-3
8 0.33UF-50V C8 CAP-PTH-SMALL-KIT 1 C322C334M5U5TA7301
9 1x2 Header J1 HDR1X2 1 0.1" Breakaway Pin Header
10 12V Reg U6 OKI78SR 1 L7812ABV
11 WEMOS D1 MINI U8 WEMOS_D1_MINI 1 Misc. eBay etc.
12 4 Resistor Array RP1,RP2 4 RESISTOR ARRAY 2 4605X-101-202LF
13 1x3 Header J10,J9 1X3 HEADER 2 2 0.1" Breakaway Pin Header
14 1N4001 D5 DO-41 1 1N4001
15 DS1034-01-09MBN044(iron) JP2 DB9 1 D09S33E4GV00LF
16 0.1UF-100V C11,C6,C7,C9 CAP-PTH-SMALL-KIT 4 SR211C104KARTR1
17 4.7KΩ R1 AXIAL-0.3 1 4.7K Ohm 0.1 watt
18 3.3KΩ(3302) R3 AXIAL-0.3 1 3.3K Ohm 0.1 watt
19 DS3231-RTC RTC1 DS3231-RTC-24C32-EEPROM 1 ?
20 5520426-4 RJ2,RJ1 5520426-4 2 5520426-4
21 RJ22 RJ3 5555980-1 1 5555980-1
22 PJ-325M/3.5MM J2 AUDIO-PJ325 1 SJ1-3533NG
23 47uF C5,C4 CAP-D5.0XF2.0 2 ECA-1VM470I
24 4POS_SCREW_TERMINAL_3.5MM JS1,JS2 4POS_SCREW_TERMINAL_3.5MM 2 1776275-4
25 4POS_SCREW_TERMINAL_2.54MM JS3 4POS_SCREW_TERMINAL_2.54MM 1 282834-4
26 MOLEX KK 1X2 J11,J6 MOLEX KK 1X2 2 22-23-2021
27 0.1UF-100V-20%(PTH) C14 CAP-PTH-SMALL-KIT 1 SR211C104KARTR1
28 2k R6 AXIAL-0.3 1 2K Ohm 0.1 watt
29 Nodemcu_esp32 U1 NODEMCU-ESP32S-NARROW 1 Nodemcu esp32
30 1x2 Header J3,J4,J5 1X2 HEADER 3 0.1" Breakaway Pin Header
31 USB B Female USB1 USB-M-49 1 61729-0010BLF
32 DA112S1 U5 S08 1 DALC112S1RL
33 LED3/5mm D1 LED3/5MM 1 3mm LED Green
34 LED3/5mm D3 LED3/5MM 1 3mm LED Red

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