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Public Domain

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RPI GPIO Motherboard Rev 5

3 years ago 1670
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

Description

This project reads 4 x PT100 temperature probes and controls 8 relays (4 heating and 4 cooling) the board mounts a Raspberry Pi which it provides filtered power for and acts as an I2C slave device for the RPi to control, advanced monitoring of the RPi activity will allow a full reset of the RPi should it become unresponsive.

The analog side is based on the Microchip AN687 design with an analog multiplexor to select the PT100 channels. Two precision calibration resistors are also integrated in to other channels in the mux allowing automatic temperature calibration down without any manual calibration at around 0.3 degC (errors due to variations in channel on resistance in the mux)

The system is Completed and tested.

Please see attached documentation and firmware

Copies also at rodyne.com

Documents

Schematic Version 5

PCB Version 5

BOM

ID Designator Footprint Quantity
1 Q1,Q2,Q3,Q4,Q5,Q6,Q7,Q8,Q9 WSOT-23 9
2 D1,D2,D3,D4,D5,D6,D7,D8 SOD123 8
3 L7 0805 1
4 U9 TS5B 1
5 L8 CD127 12*12MM BOZ 1
6 U1 Screw Terminal 5mm 5P 1
7 U3 Screw Terminal 5mm 5P 1
8 U2 Screw Terminal 5mm 12P 1
9 U7 TERMINAL_BLOCK_2P_5 1
10 L9 DR74 1
11 R25,R27,R4 0805 3
12 C4,C7,C9,R9,C11,C12,C13,C14 0805 8
13 RLA1,RLA2,RLA3,RLA4,RLA5,RLA6,RLA7,RLA8 OMRON G5NB 8
14 U5 SOIC-28 1
15 U4,U6 SOIC-8 2
16 R6,R5 0805 2
17 R11 0805 1
18 R26 RC08 1
19 C5 C1210 1
20 R17,R15,R21,R23 0805 4
21 R19 0805 1
22 L1 0805 1
23 R14,R13,R20 0805 3
24 L2 0805 1
25 L6 0805 1
26 R22 0805 1
27 L5 0805 1
28 C6 C1210 1
29 R8,R7 0805 2
30 C3,C2 0805 2
31 R12 0805 1
32 CN1 HDR2X20-reversed 1
33 F1 PTC1812L 1
34 D9 SMA-DIODE 1
35 C10 PANASONIC_SKV_CAP 1
36 JP1 1X05_LOCK 1
37 R10 0805 1
38 U8 SOT89 1
39 CT1,CT2 ELECTRO-SMD-C-6MM 2
40 ALM BZ2-7.6-D12.0XH6.5MM 1
41 R16 0805 1
42 R18 0805 1
43 TP1 PAD.03X.04 1
44 TP2 PAD.03X.04 1
45 TP3 PAD.03X.04 1
46 U13,U10 TSSOP-16 2
47 L3 L0806 1
48 R1 0805 1
49 TP4 PAD.03X.04 1

Attachments

Filename Download
RPI Temperature IOl Board R5.doc
RPI Temperature IO Board.X.zip

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