Add required dtoverlay parameter(s) to /boot/config.txt and reboot.
| Switch Position | Hardware I2C (Pi 4) | Software I2C (Bit Bang) | GPIO |
|---|---|---|---|
| I2C3 | dtoverlay=i2c3 | dtoverlay=i2c-gpio,bus=3,i2c_gpio_sda=4,i2c_gpio_scl=5 | 4 5 |
| I2C4 | dtoverlay=i2c4 | dtoverlay=i2c-gpio,bus=4,i2c_gpio_sda=8,i2c_gpio_scl=9 | 8 9 |
| I2C5 | dtoverlay=i2c5 | dtoverlay=i2c-gpio,bus=5,i2c_gpio_sda=12,i2c_gpio_scl=13 | 12 13 |
| I2C6 | dtoverlay=i2c6 | dtoverlay=i2c-gpio,bus=6,i2c_gpio_sda=22,i2c_gpio_scl=23 | 22 23 |
Note: When using multiple software I2C buses, add the parameters from highest to lowest, i.e., 6, 5, 4, 3.
https://github.com/raspberrypi/firmware/tree/master/boot/overlays
MPN: GPIO-I2C-PHAT
EAN: 0616908588436
MIT © Dan Jones - PlasmaDan.com