MQ-3 酒精感測器

具有信號輸出指示。雙路信號輸出（類比量輸出及TTL電平輸出），TTL輸出有效信號為低電平。（當輸出低電平時信號燈亮，可直接接單片機），類比量輸出0~5V電壓，濃度越高電壓越高。對乙醇蒸汽具有很高的靈敏度和良好的選擇性，具有長期的使用壽命和可靠的穩定性，快速的回應恢復特性，可應用於機動車駕駛人員及其他嚴禁酒後作業人員的現場檢測，也適用於其他場所乙醇蒸汽的檢測。

【產品規格】

• PCB尺寸：30mm X20mm
• 主要晶片：LM393、ZYMQ-3氣體感測器
• 工作電壓：直流5V

【文件下載】

程式碼

/* MQ-3 Alcohol Sensor Circuit with Arduino */

const int AOUTpin=0;//the AOUT pin of the alcohol sensor goes into analog pin A0 of the arduino
const int DOUTpin=8;//the DOUT pin of the alcohol sensor goes into digital pin D8 of the arduino
const int ledPin=13;//the anode of the LED connects to digital pin D13 of the arduino

int limit;
int value;

void setup() {
Serial.begin(115200);//sets the baud rate
pinMode(DOUTpin, INPUT);//sets the pin as an input to the arduino
pinMode(ledPin, OUTPUT);//sets the pin as an output of the arduino
}

void loop()
{
value= analogRead(AOUTpin);//reads the analaog value from the alcohol sensor's AOUT pin
limit= digitalRead(DOUTpin);//reads the digital value from the alcohol sensor's DOUT pin
Serial.print("Alcohol value: ");
Serial.println(value);//prints the alcohol value
Serial.print("Limit: ");
Serial.print(limit);//prints the limit reached as either LOW or HIGH (above or underneath)
delay(100);
if (limit == HIGH){
digitalWrite(ledPin, HIGH);//if limit has been reached, LED turns on as status indicator
}
else{
digitalWrite(ledPin, LOW);//if threshold not reached, LED remains off
}
}