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In this paper, resistance type smoke sensor and
single-chip microcomputer as the core technology
and electronic technology, designs a technology
better smoke alarm. The selection of MQ-2 type
semiconductor gas sensitive element smoke sensor
smoke detection, which has high sensitivity, fast
response, strong anti-interference ability, and the
price is low, long service life. The selection of
AT89S52chip, the integration of the A / D
conversion, hardware multiplier, hardware pulse
width modulator and other resources, with high
speed, low power, strong anti-interference and
other advantages, is of similar technology neutral
price comparison high yield quality.
With AT89S52 MCU and MQ-2 type semiconductor
resistor type smoke sensor as the core design of
the smoke alarm can alarm, fault diagnosis,
concentration level display, alarm limit settings,
temperature display and temperature alarm value
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