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Example 1 - interfacing a carbon dioxide sensor to the Raspberry Pi

We will be making use of the K30 carbon dioxide sensor (its documentation is available here, http://co2meters.com/Documentation/Datasheets/DS30-01%20-%20K30.pdf). It has a range of 0-10,000 ppm, and the sensor provides it carbon dioxide concentration readings via serial port as a response to certain commands from the Raspberry Pi.

The following diagram shows the connections between the Raspberry Pi and the K30 carbon dioxide sensor:

K30 carbon dioxide sensor interfaced with the Raspberry Pi

The receiver (Rx) pin of the sensor is connected to the transmitter (Tx-GPIO 14 (UART_TXD) ...

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