The thesis describes the structure and operation of the most important elements in the circuit. The methane gas meter is based on catalytic detection using a Pellistor element. MQ2 sensor works with Arduino Leonardo microcontroller. The program code of the microcontroller, which was used to show the gas concentration on the LCD and the operation of the sensor itself, is also described in detail. The aim of the assignment was to create a methane concentration sensor. When the sensor detects a high gas concentration, it triggers an alarm.
The process of designing and manufacturing a circuit board is also described. It includes drawing electrical diagrams and circuit boards. It was necessary to correctly select the elements for the differential amplifier, where I had the most complications, mainly because we had to use a dual power supply and stabilize the input voltages of the amplifier. The output of MQ2 was connected to the amplifier, which amplifies sensor voltage to the appropriate voltage level at the input of the microcontroller. The program code was written in the Arduino environment, which uses the C programming language.
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