This is a simple-to-use compressed natural gas (CNG) sensor, suitable for measuring natural gas (mostly methane [CH4]) concentrations in the air. The MQ-4 can detect natural gas concentrations ranging from 200 to 10000 ppm. This sensor has a high sensitivity and fast response time. The sensor's output is an analog resistance. The drive circuit is very simple: power the heater coil with 5V, add a load resistor, and connect the output to an ADC. This sensor comes in a package similar to our MQ-3 alcohol sensor, and can be used with the breakout board below. https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2009-10-01 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2016-11-25 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2016-11-28 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2016-11-29 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2016-12-09 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2016-12-13 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2017-11-10 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2017-11-13 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2017-11-24 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2017-11-28 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2018-05-05 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2018-11-21 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2018-11-27 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2022-02-22 https://elecena.pl/product/907685/methane-cng-gas-sensor-mq-4 2025-04-11