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MaxSTM3.6_IMCU

1 year ago 1510
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  • BOM
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Description

For my OnStep telescope mount controller (visit my group for more information.) This design is built around an onboard STM32F411CE processor. It has 512KB of flash, runs at 100MHz, and has a floating point unit for well rounded performance. All I/O leaving the PCB has ESD protection. All power outputs are fused (500mA, self recovery type.) This is one of the easiest OnStep controllers to build, requiring only a modest amount of soldering.

Note: This design is for non-commercial use only (see License terms, CC-BY-NC-SA 3.0)

This controller includes the following features:

  • Power: Coaxial power jack, fuse, and power switch connection.
  • Stepper drivers: Four, one for RA/Azm, one for Dec/Alt, one for a focuser, and one for a rotator/second focuser. They all share a common SPI bus for use with SSS TMC2130 and TMC5160 stepper drivers only. All stepper motor connections are available on RJ jacks at the PCB back (screw terminals are optional.)
  • EEPROM M24C64: between 2x and 8x larger than other platforms (8KB) and higher endurance, Built-in.
  • DS3231 RTC: Built-in.
  • WiFi or Ethernet: WeMos D1 Mini ESP8266 foot-print (uses Serial2.) Note that WiFi can't be flashed through the STM32F411 (you must pull the WeMos D1 Mini and plug into USB) due to software issues though the design supports it in theory.
  • USB port.
  • Mini speaker for alert buzzer.
  • DB15 15 pin D-Sub connector: primary external I/O for Gnd, +3.3V, 5V, two Home Switches, PEC, PPS, I2C, the Serial1 port, and two channels of A/B encoder inputs.
  • 3.5mm stereo mini jack: secondary external I/O for Limit Switches and Reticle.
  • RJ12 Modular connector: ST4 guider interface (with optional 5V power.)

History

  • Version3.6 - First release
  • Version3.61 - PPS was moved from Aux0 to Aux2 affording more flexibility. WeMos D1Mini reset/fw upload circuitry was removed. Added pulldown resistors for the CLK/DSO pins of TMC5160's.

Documents

Misc

PCB

Processor

Drivers

Power

BOM

ID Name Designator Footprint Quantity
1 CR2032-BS-6-1 B1 BAT-TH_CR2032-BS-6-1 1
2 100uF C1,C2,C3 CAP-SMD_BD8.0-L8.3-W8.3-RD 3
3 47uF C4,C5 CAP-SMD_BD5.0-L5.3-W5.3-RD 2
4 330nF C8 C0805 1
5 100nF C9 C1206 1
6 100nF C6,C7,C10,C15,C16,C17,C20 C0402 7
7 12pF C11,C12 C0402 2
8 2.2uF C13 C0603 1
9 22uF C14 CAP-SMD_L3.2-W1.6-R-RD 1
10 10nF C18 C0402 1
11 1uF C19 C0603 1
12 M7_C95872 D4 DO-214AC_L4.3-W2.7-LS5.3-RD 1
13 0603ESDA-05N D1,D2,D3,D5,D6,D7,D8,D9,D10,D11,D12,D13,D14,D15,D16,D17,D18,D20,D21,D22 D0603-BI 20
14 DC-005 5.5-2.0MM DC1 DC-IN-TH_DC-5520 1
15 SMD0805P050TF F1,F2,F3 F0805 3
16 XF-506P FH1 FUSE-TH_XF-506P 1
17 M2545V-02P J1 CONN-TH_M2545V-02P 1
18 PJ-325M/3.5MM J2 AUDIO-TH_PJ-325C 1
19 1x2 Header J3,J4,J6,J7 1X2 HEADER 4
20 1x3 Header J5 1X3 HEADER 1
21 1x3 Header J10 1X3 HEADER 2 1
22 1x2 Header J12 HDR1X2 1
23 DB15 JP1 DB15 1
24 XY350V-3.5-4P JS1,JS2 CONN-TH_XY350V-3.5-4P 2
25 KF128-2.54-4P JS3,JS4 CONN-TH_4P-P2.54_KF128-2.54-4P 2
26 19-217/GHC-YR1S2/3T LED1 LED0603-R-RD 1
27 19-213/Y2C-CQ2R2L/3T(CY) LED2 LED0603-R-RD 1
28 12K R1,R5,R15,R18 R0603 4
29 240 R4 R0805 1
30 2.4K R3,R6,R7,R8,R9,R10,R11,R12,R13,R14 R0603 10
31 4.7K R2,R16,R17,R19,R20,R21,R22 R0603 7
32 DS1128-05-S8B8P RJ1,RJ2 RJ45-TH_DS1128-05-S8B8P 2
33 RJ22 RJ3,RJ4 5555980-1 2
34 5555165-1 RJS1 RJ11-TH_6P-P2.54-S2.54_L18.3-W13.4-EH10.2 1
35 BUZZER SP1 BUZZER-12MM-KIT 1
36 TS-1187A-C-C-B SW1,SW2 SW-SMD_4P-L5.1-W5.1-P3.70-LS6.4 2
37 STM32F411CEU6A U1 UFQFPN-48_L7.0-W7.0-P0.50-BL-EP 1
38 TMC2130, etc. U2,U3,U4,U5 TMC2130 STEPPER MOTOR DRIVER CARRIER 4
39 12V Reg U6 OKI78SR 1
40 5V Reg U7 OKI78SR 1
41 WEMOS D1 MINI PRO U8 WEMOS_D1_MINI 1
42 DS3231MZ+ U9 SOIC-8_L4.9-W3.9-P1.27-LS6.0-BL 1
43 M24C64-RMN6TP U10 SOIC-8_L5.0-W4.0-P1.27-LS6.0-BL 1
44 AMS1117-3.3 U11 SOT-223-3_L6.5-W3.4-P2.30-LS7.0-BR 1
45 U-USBBR04P-F001 USB1 USB-B-TH_U241-041N-1BR85-1 1
46 25MHz X1 OSC-SMD_4P-L3.2-W2.5-BL 1

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