current community

your communities

more stack exchange communities

company blog
Stack Exchange Inbox Reputation and Badges
tour help
Arduino Stack Exchange is a question and answer site for developers of open-source hardware and software that is compatible with Arduino. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top
up vote 1 down vote favorite

How I can use multi smoke sensor in one code? I mean how can I use more than one sensor, where both sensors has the same purpose, like use smoke sensor in multi room. Similar to this code where one is used only. How I can more than one, in Arduino Uno R3,,

<per>
    int redLed = 12;
int greenLed = 11;
int buzzer = 10;
int smokeA0 = A5;
// Your threshold value
int sensorThres = 400;

void setup() {
  pinMode(redLed, OUTPUT);
 pinMode(greenLed, OUTPUT);
pinMode(buzzer, OUTPUT);
pinMode(smokeA0, INPUT);
Serial.begin(9600);
}

void loop() {
  int analogSensor = analogRead(smokeA0);

  Serial.print("Pin A0: ");
  Serial.println(analogSensor);
  // Checks if it has reached the threshold value
  if (analogSensor > sensorThres)
  {
    digitalWrite(redLed, HIGH);
    digitalWrite(greenLed, LOW);
    tone(buzzer, 1000, 200);
  }
  else
  {
    digitalWrite(redLed, LOW);
    digitalWrite(greenLed, HIGH);
    noTone(buzzer);
  }
  delay(100);
}

How I can add more than one sensor to get same purpose. check detect 1 and detect2 and detect 3 if one of this detection LED Red ON, Thanks`

share|improve this question
up vote 1 down vote

just duplicate the parts of the code that handle the sensor.

int redLed = 12;
int greenLed = 11;
int buzzer = 10;
int smokeSensor1 = A5;
int smokeSensor2 = A4;
int smokeSensor3 = A3;
// Your threshold value
int sensorThres = 400;

void setup() {
  pinMode(redLed, OUTPUT);
  pinMode(greenLed, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(smokeSensor1, INPUT);
  pinMode(smokeSensor2, INPUT);
  pinMode(smokeSensor3, INPUT);
  Serial.begin(9600);
}

void loop() {
  int analogSensor1 = analogRead(smokeSensor1);
  int analogSensor2 = analogRead(smokeSensor2);
  int analogSensor3 = analogRead(smokeSensor3);

  Serial.print("Pin A0: ");
  Serial.println(analogSensor1);
  // Checks if it has reached the threshold value
  if( (analogSensor1 > sensorThres) || (analogSensor2 > sensorThres) || (analogSensor3 > sensorThres) )
  {
    digitalWrite(redLed, HIGH);
    digitalWrite(greenLed, LOW);
    tone(buzzer, 1000, 200);
  }
  else
  {
    digitalWrite(redLed, LOW);
    digitalWrite(greenLed, HIGH);
    noTone(buzzer);
  }
  delay(100);
}
share|improve this answer
up vote 0 down vote

You haven't mentioned what sensor you are using, so I can't offer any help on how to interface with it. Though you can add 'multi-sensor code' by adding code that will get the state of the sensor at times when you can afford to wait a few ms before checking the state of the other sensors. With the code you provided, you could after the if/else block but before the delay.

Also, it is typically not a good idea to put sensors far away from each other but still connect them to the same controller. You should give each room its own Arduino.

share|improve this answer
    
I use Mq2 smoke sensor. I mean use mq2 sensor in many room at least 3 sensor in one Arduino uno. – Moosa Alismaili Sep 10 '16 at 16:43

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.