This is a simple port of the Sensirion provided SCD4x embedded driver over to the Raspberry Pi Pico
By default, the SCD4x I2C pins are configured for GP4 (SDA) and GP5 (SCL). This can be changed inside the "sensirion_i2c_hal.c" file
A simple demo program is given inside "main.c" which prints the CO2, Temperature, and Humidity values to a serial terminal of your choice using printf. By default, this is configured to use USB but can be changed to use UART by modifying the "CMakeLists.txt" file