I2C Usage

• Use the I2C interface on the 40PIN of the host computer
• This tutorial uses the FLY-PI V2 and LM75's I2C sensor connected to I2C2 as an example!!!
• Please note that I2C1 is already occupied by other devices and cannot be used!!!
• Please ensure the wiring is firm and stable!!!

Wiring and Detection

• This tutorial uses PI V2 as a reference

• After connecting to the FLY host computer via SSH, enter the following command to get output like below
• If using I2C0, replace the 2 in the command below with 0

sudo i2cdetect -y -r 2

• Please note that under normal circumstances, pressing Enter will immediately display content like above along with an address
• Please note the address is random
• Please note that if the wiring is incorrect, the wires are reversed, the configuration is not enabled, or the module is damaged, the output will not be normal
• The address needs to be converted from hexadecimal to decimal and then entered after i2c_address: in the configuration
• You can search online for a hexadecimal converter using a browser to perform the conversion

Configuration

[mcu host]
serial: /tmp/klipper_host_mcu

[temperature_sensor my_sensor]
sensor_type: LM75
i2c_address:72
# #   Default is 72 (0x48). Normal range is 72-79 (0x48-0x4F) and the 3
# #   low bits of the address are configured via pins on the chip
# #   (usually with jumpers or hard wired).
i2c_mcu:host
i2c_bus:i2c.2
# i2c_software_scl