72 lines
2.4 KiB
Python
72 lines
2.4 KiB
Python
#!/usr/bin/env python
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#
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# GrovePi Example for using the Grove Gas Sensor
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#
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# The GrovePi connects the Raspberry Pi and Grove sensors. You can learn more about GrovePi here: http://www.dexterindustries.com/GrovePi
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#
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# Have a question about this example? Ask on the forums here: http://forum.dexterindustries.com/c/grovepi
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#
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'''
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## License
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The MIT License (MIT)
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GrovePi for the Raspberry Pi: an open source platform for connecting Grove Sensors to the Raspberry Pi.
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Copyright (C) 2017 Dexter Industries
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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'''
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# NOTE:
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# There are 5 gas sensors
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# MQ2 - Combustible Gas, Smoke
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# MQ3 - Alcohol Vapor
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# MQ5 - LPG, Natural Gas, Town Gas
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# MQ9 - Carbon Monoxide, Coal Gas, Liquefied Gas
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# 02 - Oxygen
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# The sensitivity can be adjusted by the onboard potentiometer
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#
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# http://www.seeedstudio.com/wiki/Grove_-_Gas_Sensor
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# http://www.seeedstudio.com/wiki/Grove_-_Gas_Sensor(MQ5)
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# http://www.seeedstudio.com/wiki/Grove_-_Gas_Sensor(O%E2%82%82)
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import time
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import grovepi
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# Connect the Grove Gas Sensor to analog port A0
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# SIG,NC,VCC,GND
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gas_sensor = 0
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grovepi.pinMode(gas_sensor,"INPUT")
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while True:
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try:
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# Get sensor value
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sensor_value = grovepi.analogRead(gas_sensor)
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# Calculate gas density - large value means more dense gas
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density = (float)(sensor_value / 1024)
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print("sensor_value =", sensor_value, " density =", density)
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time.sleep(.5)
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except IOError:
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print ("Error")
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