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The following sysfs entries are available under /sys/firmware/beepy:

  • led: 0 to disable LED, 1 to enable. Write-only
  • led_red, led_green, led_blue: set LED color intensity from 0 to 255. Write- only

RGB LED over I2C

The RGB LED is connected to the RP2040. When the keyboard driver is unloaded via rmmod beepy-kbd, they can be controlled directly by the Pi via I²C.

The LED color on the Beepy is exposed on I2C bus 1 at the chip address 0x1F.

Controls are available at the following specific data addresses:


To get/set the LED color on the Beepy, you can read/write to the above registers over I2C. The values are in the range of 0x00 - 0xFF.

Note: write addresses are the read address masked with 0x80.

A value of 0 in the power register represents the LED's off state, while any other value represents on.


To set the RGB values to red and turn the LED on from the command line:

# Format:
# i2cset -y [i2cbus] [chip-address] [data-address] value
i2cset -y 1 0x1F 0xA1 0xFF
i2cset -y 1 0x1F 0xA2 0x00
i2cset -y 1 0x1F 0xA3 0x00
i2cset -y 1 0x1F 0xA0 0xFF