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Gas Alarm
The Gas Alarm is ideal for use in the kitchen or
garage, near a gas boiler, or while camping. The 68HC908QT2
microcontroller-based combustible gas detector is small, cost-effective,
and flexible. The electronic circuit evaluates change in the
internal sensor resistance. A few comparators are used to
watch the reference voltage, sensor resistance, and sensor
proper operation. An oscillator isn’t needed because the detector
uses the Nitron microcontroller’s oscillator. There are built-in
delays for after power-up and after gas is first detected
in order to avoid false alarms. By changing the sensor type,
the detector can be used for various gases. You can also add
an additional comparator to detect two different gas concentrations.
Radek Vaclavik
Czech
Republic
ok2xdx@centrum.cz
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