4 Extra I2C Buses for Raspberry Pi
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Now you can use multiple HATs with the same I2C address! The GPIO I2C pHAT is a manual I2C switch which mounts under your HAT to remap its I2C pins to 1 of 4 additional I2C buses. By making use of th…
Read More…Now you can use multiple HATs with the same I2C address!
The GPIO I2C pHAT is a manual I2C switch which mounts under your HAT to remap its I2C pins to 1 of 4 additional I2C buses.
By making use of the extra hardware I2C buses introduced on Raspberry Pi 4 (BCM2711) or software I2C (bit bang), the GPIO I2C pHAT offers a plug-in solution to overcome the limitations of the infamous “8 HAT limit” seen on many available HATs, without the need for a multiplexer or expander.
Simply attach the GPIO I2C pHAT to your Pi, select your preferred I2C bus and mount your HAT on top. Switching is controlled using a 4-position double-pole slide switch, which allows you to quickly switch between buses.
Multiple GPIO I2C boards can be stacked along with other HATs or pHATs, and it’s fully compatible with our HAT RACK mounting boards.
Includes a breakout header for the 4 extra I2C buses. These are always connected to the associated GPIO pins so can be used regardless of the switch position. Note: external pull-up resistors to 3.3V required.
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.
You can find this and our other Raspberry Pi projects on our GitHub page.
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