This analogue gas sensor has a small heating element with an electronic-chemical sensor. It is suitable for use in buildings and can only provide accurate readings once the warm-up phase is complete. measurable substances - Benzene (C6H6) - Ammonia (NH3) - Sulphide - Smoke - other air contaminants - compatible with Arduino - compatible with Raspberry Pi only in combination with art. no. RPI ADC (see accessories) - 10 - 1000 ppm Measuring range - high sensitivity - Detection of a wide range of concentrations - Evaluation of the measured values from the microcontroller (analog) - Threshold value setting possible (digital) - 24 V DC Loop voltage - 5 V DC Heating voltage - 31 Ohm (+/- 3 Ohm) at room temperature - 900 mW Heat output - - -10 ... +50 °C Operating temperature Connections - VCC: Power supply 5V - GND: Ground connection - AOUT: Analog output - DOUT: Digital output Dimensions - L x W x H: 52 x 20 x 18 mm Note Attention: The sensor gets warm during operation! https://elecena.pl/product/18282369/sen-mq135-developer-boards-gas-sensor-benzene-fume-mq-135 2021-05-02 https://elecena.pl/product/18282369/sen-mq135-developer-boards-gas-sensor-benzene-fume-mq-135 2025-02-08