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<p><span style=”font-family:Arial,Helvetica,sans-serif;”><strong><span style=”font-size:18px;”>Description</span></strong></span></p>
<p><span style=”font-family:Arial,Helvetica,sans-serif;”><span style=”font-size:14px;”>Carbon Monoxide Gas Sensor MQ-7 detects the concentrations of CO in the air and ouputs its reading as an analog voltage. The sensor can measure concentrations of 10 to 10,000 ppm. The sensor can operate at temperatures from -10 to 50°C and consumes less than 150 mA at 5 V.</span></span></p>
<p><span style=”font-family:Arial,Helvetica,sans-serif;”><span style=”font-size:14px;”>Connecting five volts across the heating (H) pins keeps the sensor hot enough to function correctly. Connecting five volts at either the A or B pins causes the sensor to emit an analog voltage on the other pins. A resistive load between the output pins and ground sets the sensitivity of the detector. The resistive load should be calibrated for your particular application using the equations in the datasheet, but a good starting value for the resistor is 10 kΩ.</span></span></p>
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<p><span style=”font-family:Arial,Helvetica,sans-serif;”><strong><span style=”font-size:18px;”>Specification</span></strong></span></p>
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<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Stable and Long Life</span></span></p>
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<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Target Gas: Carbon Monoxide</span></span></p>
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<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Detection range: 20ppm-2000ppm</span></span></p>
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<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Circuit voltage: 5V±0.1 AC or DC </span></span></p>
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<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Heater Voltage: 5.0V±0.1V AC or DC</span></span></p>
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<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Heating consumption: About 350mW </span></span></p>
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<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Operating Temperature: -20℃-50℃</span></span></p>
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<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Sensing Resistance: 2-20kΩ (In 100ppm)</span></span></p>
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<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Dimensions: 20mm Diameter, 23mm High excluding pins</span></span></p>
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<p><span style=”font-family:Arial,Helvetica,sans-serif;”><span style=”font-size:14px;”><a href=”https://datasheetspdf.com/pdf-file/694312/Hanwei/MQ7/1″>Datasheet: MQ-7 GAS SENSOR</a></span></span></p>
<p><span style=”font-family:Arial,Helvetica,sans-serif;”><span style=”font-size:14px;”><a href=”http://www.savvysolutions.info/savvymicrocontrollersolutions/index.php?sensor=mq-7-gas-sensors”><span style=”color:#3498db;”>More information: MQ-7 Carbon Monoxide Gas Sensor</span></a></span></span></p>
<p><span style=”font-family:Arial,Helvetica,sans-serif;”><span style=”font-size:14px;”><a href=”https://iotdunia.com/smoke-detector/”><span style=”color:#3498db;”>Tutorial: Smoke Detector using Arduino and Smoke Sensor</span></a></span></span></p>
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