LM35 and how to put out average reading

Forum 2005-2010 (read only) Hardware Interfacing
#1

Hey guys, im trying to figure out how to take an average of 10 readings every second and to put out that average reading into serial print for a duration of 5 minutes for both heating and cooling.

Can you guys help write a code for me, I just dont know what to do. Do i put in another for loop inside the for loop of 300?

Heres the code I have so far:

void setup()
{
pinMode(2, OUTPUT); // sets the digital
Serial.begin(9600);
delay(500);
}
void loop()
{
int adin;
float tpc, tpf;
Serial.println("Heater On");
digitalWrite(2, HIGH); // turns the LED on
for(int i=1; i<=300; i++)
{
adin=analogRead(0);
tpc=adin*.4888;
tpf=tpc*1.8+32.;
Serial.println(i);
Serial.println(tpf);
delay(2000);
}
Serial.println("Heater Off");
digitalWrite(2, LOW); // turns the LED off
for(int i=1; i<=300; i++)
{
adin=analogRead(0);
tpc=adin*.4888;
tpf=tpc*1.8+32.;
Serial.println(i);
Serial.println(tpf);
delay(2000);
}
}
#2

http://www.arduino.cc/en/Tutorial/Smoothing

That will help you.

Mowcius

#3

void setup()
{
pinMode(2, OUTPUT); // sets the digital
Serial.begin(9600);
delay(500);
}

void loop()
{
int adin;
Serial.println(“Heater On”);
digitalWrite(2, HIGH); // turns the LED on
for(int i=1; i<=300; i++)
{
float average=0;

for(int j=1; j<=10; j++)
{
delay(100);
adin=analogRead(0);
// sum of all readings
average=average+adin;
}

// sum of all readings divided by number of readings
average=average/10;

Serial.println(i);
Serial.println(average);
}

Serial.println(“Heater Off”);
digitalWrite(2, LOW); // turns the LED off

for(int i=1; i<=300; i++)
{
float average=0;

for(int j=1; j<=10; j++)
{
delay(100);
adin=analogRead(0);
// sum of all readings
average=average+adin;
}

// sum of all readings divided by number of readings
average=average/10;

Serial.println(i);
Serial.println(average);
}
}

Was this heplfull to you?

Mowcius solution is ofcourse better but maybe harder to understand for a beginner…

#4