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5V O2 Sensor Circuit using LM3914 LED Display for Car Air-Fu

2014-12-14 21:42  
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Oxygen (O2) sensors are used to sense the amount of oxygen in the exhaust gases. The following circuit uses twoLM3914s Dot/Bar Display Driver ICfor the LED display. This O2 sensor circuit will be used as air fuel mixture meter of cars.

car O2 sensor circuit diagram

This sensor operates at 5V regular supply, uses 1/4 Watt 1K resistors, 10V 2.2 or 4.7 uF filter capacitor and 0.95V potentiometer on pin 6 of LM3914 which will cause the last LED to turn on when the input from the sensor exceeds 0.95V. To prevent over voltage of the battery, it uses regulator which also has an internal thermal sensing circuit that limits the current output to avoid damaging the regulator.


Detailed explanation on5V O2 Sensor Circuit using LM3914 LED Display for Car Air-Fuel Mixture Metercan be seen here in the pdf filetype (source: buckeyetriumphs.org)