Car Project Home :: Projects Home

This document serves as the main reference for all wired connections in the car project.

Arduino Digital Pins

• D0 → Empty/Serial RX
• D1 → Empty/Serial TX
• D2 → LCD Pin 1 (rs/4)
• D3 → Power LED (PWM)
• D4 → LCD Pin 2 (rw/5)
• D5 → Button 1
• D6 → Button 2
• D7 → LCD Pin 3 (enable/6)
• D8 → LCD Pin 4 (d4)
• D9 → Button 3
• D10 → Button 4
• D11 → LCD Pin 5 (d5)
• D12 → LCD Pin 6 (d6)
• D13 → LCD Pin 7 (d7)

Arduino Analog Pins

• A0 → Temp Sensor 1 (internal)
• A1 → Temp Sensor 2 (cabin)
• A2 → Empty (Future Temp 3 – external temp)
• A3 → Empty
• A4 → I2C SDA
• A5 → I2C SCL

I2C Bus Connections and Devices

Device 0: I/O Expander 1 (8Ch)

• Ports 0-7 → Interface Buttons 1-8 — removed from project r. d. 2010/04/02 12:31

Device 1: I/O Expander 1 (8Ch)

• Ports 0-7 → LED Indicators 1-8 (all sinks)

Device 2: I/O Expander 2 (8Ch)

• Ports 0-5 → Audio Line Selects 1-6
• These will be wired through a set of CMOS NOT gates since the bus chips enable low instead of high.

Device 3: CMOS Clock

• Need to decide how this is powered
• Depending on resolution above, may need a bus voltage changing chip.

No other I2C devices are planned at this time.