LED Alcohol Tester DIY with MQ-3 Sensor - KIT by ICStation
This circuit is an Alcohol tester, based on MQ-3 sensor, thanks to which it is able to detect alcohol vapors. When the sensor MQ-3 detect alcohol vapor, the conductivity of the sensor will be the same as the alcohol vapor concentration. By measuring the series partial pressure between the sensor and the fixed resistor, the alcohol content in the air can be judged.
► Buy this KIT: http://www.icstation.com/sensor-alcoh...
● About MQ-3 Sensor: MQ-3 is a gas sensor that has also high sensitity to Alcohol, and has good resistance to disturb of gasoline, smoke and vapor. This sensor provides an analog resistive output based on alcohol concentration. When the alcohol gas exist, the sensor's conductivity gets higher along with the gas concentration rising.
The IC that drives this circuit is a NE555, the rest are simple components.. there is a relay with which, analyzing the circuit, it is possible to drive an external device, like a visual alarm etc.
● Components:
1x NE555 IC
1x 8 Pin IC Socket
1x MQ-3 Gas Sensor
1x Green LED 5mm
1x Red LED 5mm
1x 1N4148 Diode
1x Buzzer
1x 5V Relay (Model: HK23F-DC5V)
1x Toggle Switch
1x Power Socket (DC-005)
2x 1KΩ resistors
1x 120Ω Resistor
1x 5.1Ω Resistor
1x 10KΩ Trimmer
1x PCB (Size: 63*37*1.4mm)
For this test I will smell 45° whiskey to the sensor🍺
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Chapters:
0:00 - Intro
0:33 - Explanations
0:55 - Unboxing
1:31 - Start Assembly
4:24 - Test
5:17 - END
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WARNING: This video is only for demonstration. I don't take any responsibility.
#MQ3 #Sensor #diyprojects