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MaxPCB3.5

2 months ago 237
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Description

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.) 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. 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. In this design it is possible to flash the WeMos through OnStep. 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.) On 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 3.0 First release of updated MaxPCB2 design, through-hole components only. Version 3.5 uses SMT components for easier assembly and potientially lower cost.

Documents

Schematic

PCB

BOM

ID Name Designator Footprint Quantity
1 5V Reg U7 OKI78SR 1
2 1x2 Header J12 HDR1X2 1
3 12V Reg U6 OKI78SR 1
4 RJ22 RJ3,RJ4 5555980-1 2
5 19-213/Y2C-CQ2R2L/3T(CY) LED2,LED3 LED0603-R-RD 2
6 WEMOS D1 MINI PRO U8 WEMOS_D1_MINI 1
7 KF128-2.54-4P JS3,JS4 CONN-TH_4P-P2.54_KF128-2.54-4P 2
8 XY350V-3.5-4P JS2,JS1 CONN-TH_XY350V-3.5-4P 2
9 TMC2130, etc. U3,U2,U4,U5 TMC2130 STEPPER MOTOR DRIVER CARRIER 4
10 1x3 Header J10,J9 1X3 HEADER 2 2
11 01530008Z FH1 01530008Z 1
12 1x5 Header J13 1X5 HEADER 1
13 47uF C4,C5 CAP-SMD_BD5.0-L5.3-W5.3-RD 2
14 2.4K R10,R9,R8,R7,R11,R12,R13,R14,R1,R1B,R6 R0805 11
15 19-217/GHC-YR1S2/3T LED1 LED0603-R-RD 1
16 TEENSY_3.5_3.6_BASIC U1 TEENSY_3.53.6_BASIC 1
17 DS3231-RTC-SINGLE-HEADER RTC1 DS3231-RTC-24C32-EEPROM-SINGLE-HEADER 1
18 M2545V-02P J1 CONN-TH_M2545V-02P 1
19 DC-005 5.5-2.0MM DC1 DC-IN-TH_DC-5520 1
20 240 R4 R0805 1
21 0603ESDA-05N D5,D6,D7,D8,D9,D10,D11,D12,D13,D14,D15,D1 D0603-BI 12
22 DS1128-05-S8B8P RJ1,RJ2 RJ45-TH_DS1128-05-S8B8P 2
23 PJ-325M/3.5MM J2 AUDIO-TH_PJ-325C 1
24 100nF C6,C7,C10 C0402 3
25 3.3K R5,R2,R3 R0603 3
26 5555165-1 RJS1 RJ11-TH_6P-P2.54-S2.54_L18.3-W13.4-EH10.2 1
27 100nF C9 C1206 1
28 DS1037-09FNAKT74-0CC J3 DSUB-TH_DS1037-09FNAKT74-0CC 1
29 330nF C8 C0805 1
30 M7_C95872 D4 DO-214AC_L4.3-W2.7-LS5.3-RD 1
31 100uF C1,C2,C3 CAP-SMD_BD8.0-L8.3-W8.3-RD 3
32 BUZZER SP1 BUZZER-12MM-KIT 1

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