MQ-7 CO Carbon Monoxide
  • MQ-7 CO Carbon Monoxide

MQ-7 CO Carbon Monoxide

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7,43 €

Carbon monoxide (CO) is a very dangerous gas which is odorless, colorless, and tasteless, so it cannot be smelt, seen, or tasted. A person really would have no idea that they are breathing in CO besides the fact that they would start to feel horrible.


  • Política de segurança Política de segurança
  • Política de entrega 24/48H Política de entrega 24/48H
  • Política de devolução Política de devolução

he most common symptoms of CO poisoning is headache, nausea, vomiting, dizziness, fatigue, and a feeling of weakness. Neurological signs include confusion, disorientation, visual disturbance, syncope, and seizures.

Carbon monoxide is produced from the partial oxidation of carbon-containing compounds; it forms when there is not enough oxygen to produce carbon dioxide (CO), such as when operating a stove or an internal combustion engine in an enclosed space.


Mainly used for CO collection detection in family, factory, underground operation.

  • Detection Zone:10 to 1000ppmm.
  • Characteristic Gas:100ppmm co.
  • Sensitive Resistance:2K to 20K in 100ppm co.
  • Sensitivity:>=3%.
  • Response Time:<=1s.
  • Recovery Time:<=30s.
  • Heating Resistance:31±3.
  • Heating Current:<=180mA.
  • Heating Voltage:5.0V±0.2V /1.5±0.1V.
  • Heating Power: about 350mW.
  • Conditions:Ambient Temperature:-20C~+50C.
  • Humidity:<=95%RH.
  • Oxygen Content:21% .
  • Size: 3.5cm X 2.2cm - 1.4inch x 0.9inch.


CO is measured in parts per million (ppm). To give you some perspective, the natural atmosphere is composed of 0.1ppm. Ther average level in homes is 0.5-5ppm. The level near properly adjusted gas stoves in homes and from modern vehicle exhaust emissions is 5-15ppm. The exhaust from automobilies in Mexico City central area is 100-200ppm. The amount of CO that can be created from the exhaust from a home wood fire is 5000ppm. Concentrations as low as 667ppm may cause up to 50% of the body's hemoglobin to convert to carboxyhemoglobin. A level of 50% carboxyhemoglobin may result in seizure, coma, and fatality.



const int AOUTpin=0; //the AOUT pin of the CO sensor goes into analog pin A0 of the arduino
const int DOUTpin=8; //the DOUT pin of the CO 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 CO sensor's AOUT pin
limit= digitalRead(DOUTpin); //reads the digital value from the CO sensor's DOUT pin

Serial.print("CO value: ");
Serial.println(value); //prints the CO value

Serial.print("Limit: ");
Serial.print(limit); //prints the limit reached as either LOW or HIGH (above or underneath)

if (limit == HIGH){

digitalWrite(ledPin, HIGH); //if limit has been reached, LED turns on as status indicator



digitalWrite(ledPin, LOW); //if threshold not reached, LED remains off


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