License

Public Domain

RPI GPIO Motherboard Rev 5

2 years ago 1070
  • 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 Value Qty. Package Components Manufacturer Part Supplier RS-Online SeeedStudio
1 2N7002 Q1,Q2,Q3,Q4,Q5,Q6,Q7,Q8,Q9 WSOT-23 9
2 1N4001 D1,D2,D3,D4,D5,D6,D7,D8 SOD123 8
3 PWR L7 0805 1
4 LM2576HVS-5.0NOPB U9 TS5B 1
5 150u L8 CD127 12*12MM BOZ 1
6 hot U1 Screw Terminal 5mm 5P 1
7 cold U3 Screw Terminal 5mm 5P 1
8 analog U2 Screw Terminal 5mm 12P 1
9 PWR U7 TERMINAL_BLOCK_2P_5 1
10 22u L9 DR74 1 DR74-220-R RS-Online 770-1151
11 10k R25,R27,R4 0805 3
12 100 C4,C7,C9,R9,C11,C12,C13,C14 0805 8
13 RELAY SPST RLA1,RLA2,RLA3,RLA4,RLA5,RLA6,RLA7,RLA8 OMRON G5NB 8
14 PIC16F1782-ESO U5 SOIC-28 1
15 MCP607-ISN U4,U6 SOIC-8 2
16 100k R6,R5 0805 2
17 49.9k R11 0805 1
18 1k R26 RC08 1
19 0.33 C5 C1210 1
20 25k R17,R15,R21,R23 0805 4
21 2k R19 0805 1
22 AN1 L1 0805 1
23 1k R14,R13,R20 0805 3
24 AN2 L2 0805 1
25 5V L6 0805 1
26 1.5k R22 0805 1
27 3V3 PIC L5 0805 1
28 10u C6 C1210 1
29 25K R8,R7 0805 2
30 100n C3,C2 0805 2
31 3.09K R12 0805 1
32 Raspberry Pi 2 CN1 HDR2X20-reversed 1
33 1.5A 24V PTC F1 PTC1812L 1
34 ss34 D9 SMA-DIODE 1
35 100u C10 PANASONIC_SKV_CAP 1
36 ICSP JP1 1X05_LOCK 1
37 49.9K R10 0805 1
38 L78L33ABUTR U8 SOT89 1
39 220uF CT1,CT2 ELECTRO-SMD-C-6MM 2 CS1E221M-CRE77 SeeedStudio 302030053
40 ALM ALM BZ2-7.6-D12.0XH6.5MM 1 KS-12065D03YA SeeedStudio 312010004
41 124 R16 0805 1
42 95.3 R18 0805 1
43 TP1mA TP1 PAD.03X.04 1
44 TP-ADC-IN TP2 PAD.03X.04 1
45 TP-Vref TP3 PAD.03X.04 1
46 NX3L4051 U13,U10 TSSOP-16 2
47 10uH L3 L0806 1 LQH2MCN100K02L SeeedStudio 303010042
48 0 R1 0805 1
49 TP-GND TP4 PAD.03X.04 1

Attachments

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

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