License

GPL 3.0

Tags
OnStep
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MaxPCB1.2x (obsolete)

3 years ago 6817
  • 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 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.) There's a power jack, fuse, and power switch connection. There are several connectivity options: USB, two I2C ports (w/common footprints for the DS3231 RTC and BME280.) There are two serial ports. Serial4 is brought out on a Molex connector (w/power.) Nearby there is a limit sense input (to stop the mount.) 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.) And finally, there's a mini speaker output for an alert buzzer.

Documents

Schematic

PCB

BOM

ID Value Qty. Package Components
1 TEENSY_3.5_3.6_BASIC 1 TEENSY_3.53.6_BASIC_ONSTEP U1
2 A4988, etc. 4 GENERIC STEPPER MOTOR DRIVER CARRIER U3,U2,U4,U5
3 MOLEX KK 1X4 4 MOLEX KK 1X4 J3,J4,J2,J17
4 RJ22 1 4P4C RJ1
5 RJ22 1 4P4C RJ2
6 POWER_JACKPTH 1 POWER_JACK_PTH JP1
7 FUSE 1 FUSEHOLDER_MINI_BLADE F1
8 MOLEX KK 1X2 3 MOLEX KK 1X2 J1,J11,J12
9 5V Reg 1 OKI78SR U7
10 100uF 2 CAP-D8.0XF3.5 C1,C2
11 100uF 1 CAP-D6.3XF2.5 C3
12 47uF 2 CAP-D5.0XF2.0 C4,C5
13 RJ12 1 6P6C RJ3
14 USB B Female 1 USB-M-49 USB1
15 0.1UF-100V-20%(PTH) 5 CAP-PTH-SMALL-KIT C6,C7,C9,C10,C11
16 MOLEX KK 1X3 3 MOLEX KK 1X3 J10,J8,J9
17 1x2 Header 5 HDR1X2 J13,J15,J7,J20,J21
18 1x6 Header 2 HDR1X6 J14,J16
19 1x7 Header 1 HDR1X7 U14
20 RED5mm 3 LED-5MM D1,D2,D3
21 0.33UF-50V-20%(PTH) 1 CAP-PTH-SMALL-KIT C8
22 Bused Resistor Network 5pin 1 RESSIP-5 RP1
23 SPEAKER 1 12MM SPEAKER SP1
24 2N3904 1 TO92-3L Q1
25 1N4148 1 DO-35 D4
26 1x3 Header 2 HDR1X3 J18,J19
27 MOLEX KK 1X5 2 MOLEX KK 1X5 J5,J6
28 10KΩ 1 AXIAL-0.3 R1
29 8.2KΩ 2 AXIAL-0.3 R2,R3
30 2.2KΩ 1 AXIAL-0.3 R4
31 1KΩ 1 AXIAL-0.3 R5
32 68Ω 1 AXIAL-0.4 R6
33 12V Reg 1 OKI78SR U6

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