ArduinoMQ135气体感应器一、接线MQ135有4个引脚,分别为VCC、GND、A0、D0,这里只需要使用到VCC、GND、A0.以下图是esp8266接线图。由于测量气体值PPM时,跟空气的温湿度是相关的。所以我们这里加了一个DHT22。DHT22传送门 VCC->3VGND->G A0->A0二、MQ135库 下载地址:https://github.com ...
float ppm = pow(10, ((log10(ratio)-b)/m)); //use formula to calculate ppm Value = ppm; Serial.print(ppm); Serial.print(" ppm,"); Serial.print(VRL); Serial.println(" v"); if (VRL > 1) { if (play_state == HIGH) { myDFPlayer.play(1); } } }Footer...
Updated and improved Arduino library for the MQ135 gas/air quality sensor. This library is also available in the Arduino IDE, see Arduino Library List. Datasheet Can be found here. Application This type of sensor is used in air quality control equipments for buildings/offices and is suitable ...
#define ADC_Bit_Resolution 12 // For arduino UNO/MEGA/NANO #define RatioMQ135CleanAir 3.6//RS / R0 = 3.6 ppm double CO2 = (0); MQUnifiedsensor MQ135(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type); void setup() { Serial.begin(9600); if(Serial) Serial.println("Serial ...
Arduino MQ-7 / MQ-309A ** Note **issue: MQ-7 and MQ-309 needs two different voltages for heater, they can be supplied by PWM and DC Signal controlled by your controller, another option is to use two different power sources, you should use the best option for you, next i will show...