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PI2-EX
Hardware Attachments
Fig. 1 - Raspberry Pi2 40-pin GPIO with all labels​.
Fig. 2 - LCD labels​.
Fig. 3 - 7-segment display and first mcp 23S17IC labels.
Fig. 4 - Second mcp connected to digital inputs and switches. Labels for ULN also presented.
Fig. 5 - ULN labels and connections to LEDs, optocouplers and relays.
Fig. 6 - Circuit [1] - Schematic of the first circuit used to test SPI.
Fig. 7 - Circuit [2] - Schematic of the circuit used to test the optocoupler and the relay.
Fig. 8 - Complete PCB layout ready for manufacteur - hardware of the Raspberry pi expansion board.
2 - SPI communication protocol test circuit
3 - Optocoupler and relay test circuit
4 - Expansion board PCB layout
1 - Schematic of the expansion board
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