I2C is a hardware bus used across many microprocessors and microcontrollers, including the Raspberry Pi. It permits sensors and other IO devices to be connected to the controller (and/or each other) with only four wires (or really only two if you don't count Vcc and ground):
- Vcc (3-6v)
- SDA
- SCL
- Gnd (Ground)
The Pimoroni "Breakout Garden" set of I2C sensors also includes an "INT" (interrupt) pin, AKA "GCLK" or "GPIO4".
Some well known I2C products:
| Stock | Brand | Description | 7 bit address | Notes |
|---|---|---|---|---|
| 1 | Pimoroni | LTR-559 Light & Proximity | 0x23 | |
| 1 | Pimoroni | VL53L1X Time of Flight (ToF) | 0x29 | range 40mm-4m |
| 1 | Adafruit | VL6180X Time of Flight Distance Sensor | 0x29 | range 5-100mm |
| 1 | Pimoroni | 11x7 LED Matrix #1 | 0x75 | |
| 1 | Pimoroni | 11x7 LED Matrix #2 | 0x77 | |
| 1 | Pimoroni | 5x5 RGB Matrix | 0x74 / 0x77 | 77 will be in conflict with 11x7 #2 |
| 1 | Pimoroni | ADS1015 +/-24V ADC 3 Channel | 0x48 / 0x49 | |
| 2 | Adafruit | ADS1015 12 bit ADC 4 Channel w Prog Gain | 0x48 - 0x4B (jumpers) | |
| 1 | PiBorg | Thunderborg | 0x10 / 0x11 | |
| 1 | PiBorg | Ultraborg | 0x36 | |
| 1 | Pimoroni | ICM20948 9-DOF Motion Sensor | 0x68 / 0x69 | |
| 1 | Adafruit | BNO055 Absolute Orientation Sensor | 0x28 / 0x29 | |
| 0 | Adafruit | VCNL4010 Proximity Sensor | 0x13 | |
| 0 | Adafruit | LSM9DS1 Accel Gyro Mag Temp 9-DOF | 0x1C / 0x1E Accel, 0x6A / 0x6B for Gyro | |
| 0 | Adafruit | VL53L0X Time of Flight Distance Sensor | 0x29 | range 50-1200mm (2m on long range) |
"Stock" is how many Murray has in his robot laboratory as part of exploratory design and development of the KR01 robot.
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