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This application note describes how to directly read and write data directly to the SenseAir K30 and K33 line of CO2 sensors. Please read the MODBUS specification document before reading this document to gain a background understanding on the sensor’s implementation of MODBUS and for checksum calculating algorithms. Using these commands opens up the entire EEPROM and RAM of the sensor for UART access. It will also allow us to access the sensor using the memory locations described in the I2C guide.

The Arduino makes an ideal platform for prototyping and data collection with the SenseAir K series of CO2 sensors. Arduino CO2 Sensor Application Note From Wikipedia: Arduino is a single-board micro controller to make using electronics in multidisciplinary projects more accessible. The hardware consists of an open-source hardware board designed around an 8-bit Atmel AVR microcontroller, or a 32-bit Atmel ARM. The software consists of a standard programming language compiler and a boot loader that executes on the micro controller. Arduino boards can be purchased pre-assembled or as do-it-yourself kits. Hardware design information is available for those who would like...