This is a set of Arduino sketches to make use of the CoZIR gas sensors. These sensors can measure temperature, humidity and CO₂. They are sold by Gas Sensing Solutions. The code is based on and partly copied from a thread on the Arduino forum, where users DirtGambit and robtillaart did great work making it possible for Arduino users to use these sensors.

#Tools# ###Calibrate### Commands the sensor to calibrate itself. To be used when the sensor is surrounded by fresh air. ###LogToCSV### Polls the sensor and logs average and extreme measurements at fixed intervals. Via the serial monitor (USB) the log can be requested as CSV, that can be copied to a spreadsheet. About nine logs can be made before the memory is full. As soon as I have a datalogger shield, I will make sketch for creating bigger logs. ###LogToSerial### Gets the sensor's measurements and sends these to the serial port. ###SetDigiFilter### The digital filter can be adjusted to filter out noise in the measurements ###SetToPolling### Polling is the preferred mode as it potentially uses less energy. The tools require polling mode. ###SetToStreaming### Streaming is the factory default.

#Setup#

• Use the wiring schematic from C02meter.com (see below). The tools use digital pins 3 and 2 instead of the ones shown in that manual. Connect pin 3 to the sensor's Rx pin and pin 2 to the sensor's Tx pin.
• Install the dependencies.

#Documentation#

• Wiring schematic - Link only works if you click the first result of the Google search "Arduino Cozir"
• CoZIR Software user guide contains the documentation for the serial interface.

#Dependencies#

• The tools use Rob Tillaart's Cozir Library.
• The loggers also need the Average library.
• The LogToSD tool requires a DataLogger shield and this DS1307RTC library.
• The LogToCSV tool for logging without DataShield requires the Time library

To install libraries, download it to your Arduino/library folder and restart the Arduino IDE.