gas meter whit mq7 sensor

利用温度传感器DHT11、湿度传感器DS１８Ｂ２０、一氧化碳传感器MQ７测环境参数，并通过１２８６４液晶显示，用蜂鸣器报警-Use of the temperature sensor DHT11, humidity sensor DS18B20, carbon monoxide MQ7 sensor measuring environmental parameters, and through the 12864 LCD display, with a buzzer alarm．

MQ7一氧化碳传感器，模拟输出的电压经过STC12C5A60S2单片机内部自带的AD转换输出一个数字电压-MQ7 carbon monoxide sensor, analog output voltage through STC12C5A60S2 MCU internal AD conversion and output a digital voltage

Arduino, respectively, using DHT11 temperature and humidity sensors and MQ7 gas sensors in 1.44 inches ST7735S drive OLED screen display code(Arduino applications DHT11 temperature and humidity sensors in 1.44 inches ST7735S drive OLED screen display