Why does the temperature change its value if we connect the MQ-4 sensor?

Question

Arduino

Arduino sketch:

int sensorPin = 0; 
int Gas = 1;

void setup()
{
  Serial.begin(115200);  
                       
}
 
void loop()                     
{

 int reading = analogRead(sensorPin); 
 

 float voltage = reading * 5.0;
 voltage /= 1024.0; 
 
 
 // now print out the temperature
 int temperatureC = (voltage - 0.5) * 100 ;  
 Serial.println(temperatureC);
 Serial.println(analogRead(Gas));
 delay(1000);                                     //waiting a second
}

TMP 36 GZ - on A0 + 3.3V and GND.
MQ-4 - on A1 + 5V and GND.
When I give power to the MQ-4, the temperature sensor starts to run and show the wrong results
. What could be the problem?

Answer 1

Maybe that the MQ-4 has a built-in heater that changes the temperature, including next to it? And judging by the sketch, you use the mode with the heater constantly on.