Hello im kinda new to arduino programming and i ran into a problem with this program. im sure you people can help me.
Im making a program to measure a temp sensor and use that temp value to control a relay.
The temp sensor is working fine but i get a error when trying to use the relay.
I have attached project
thanks in advance
Leon
Temp.ino (717 Bytes)
See the comments at the error locations.
Please read the how to use this forum-please read stickies to see how to post code. If you have compile errors, post the entire error message.
This compiles without errors:
int ThermistorPin = 0;
int Vo;
float R1 = 10000;
float logR2, R2, T, Tc;
float c1 = 1.009249522e-03, c2 = 2.378405444e-04, c3 = 2.019202697e-07;
const int pump = 2; //pump relay
int pstart = 45.00;
int pstop = 40.00;
void setup()
{
Serial.begin(9600);
pinMode (pump, OUTPUT);
}
void loop()
{
{
Vo = analogRead(ThermistorPin);
R2 = R1 * (1023.0 / (float)Vo - 1.0);
logR2 = log(R2);
T = (1.0 / (c1 + c2 * logR2 + c3 * logR2 * logR2 * logR2));
Tc = T - 273.15;
Serial.print("Temperature: ");
Serial.print(Tc);
Serial.println(" C");
}
if (Tc > pstart ) // stray comma
{
digitalWrite(pump, LOW);
}
else if (Tc < pstop ) // stray comma
{
digitalWrite(pump, HIGH);
}
delay(500);
}
Thank you so much:)
groundFungus:
See the comments at the error locations.Please read the how to use this forum-please read stickies to see how to post code. If you have compile errors, post the entire error message.
This compiles without errors:
int ThermistorPin = 0;
int Vo;
float R1 = 10000;
float logR2, R2, T, Tc;
float c1 = 1.009249522e-03, c2 = 2.378405444e-04, c3 = 2.019202697e-07;
const int pump = 2; //pump relay
int pstart = 45.00;
int pstop = 40.00;
void setup()
{
Serial.begin(9600);
pinMode (pump, OUTPUT);
}
void loop()
{
{
Vo = analogRead(ThermistorPin);
R2 = R1 * (1023.0 / (float)Vo - 1.0);
logR2 = log(R2);
T = (1.0 / (c1 + c2 * logR2 + c3 * logR2 * logR2 * logR2));
Tc = T - 273.15;
Serial.print("Temperature: ");
Serial.print(Tc);
Serial.println(" C");
}
if (Tc > pstart ) // stray comma
{
digitalWrite(pump, LOW);
}
else if (Tc < pstop ) // stray comma
{
digitalWrite(pump, HIGH);
}
delay(500);
}
Btw is it possible to set a time so the temp needs to be over something like 30 degrees for 2 seconds before the relay turns on?
groundFungus:
See the comments at the error locations.Please read the how to use this forum-please read stickies to see how to post code. If you have compile errors, post the entire error message.
This compiles without errors:
int ThermistorPin = 0;
int Vo;
float R1 = 10000;
float logR2, R2, T, Tc;
float c1 = 1.009249522e-03, c2 = 2.378405444e-04, c3 = 2.019202697e-07;
const int pump = 2; //pump relay
int pstart = 45.00;
int pstop = 40.00;
void setup()
{
Serial.begin(9600);
pinMode (pump, OUTPUT);
}
void loop()
{
{
Vo = analogRead(ThermistorPin);
R2 = R1 * (1023.0 / (float)Vo - 1.0);
logR2 = log(R2);
T = (1.0 / (c1 + c2 * logR2 + c3 * logR2 * logR2 * logR2));
Tc = T - 273.15;
Serial.print("Temperature: ");
Serial.print(Tc);
Serial.println(" C");
}
if (Tc > pstart ) // stray comma
{
digitalWrite(pump, LOW);
}
else if (Tc < pstop ) // stray comma
{
digitalWrite(pump, HIGH);
}
delay(500);
}
Yes, refer to the beginners guide to millis() and the several things at a time tutorial to see how to use millis() (and micros()) for timing.
Here is an illustration of setting up a timer and resetting the timer when temp is less than 512* so that the relay (led in this code) will not actuate till 3 seconds after temp reaches 512. Once temp drops below 512 the LED (relay) turns off.
*I don't have a temp sensor or relay handy so I used a pot and LED to test the code.
const byte analogInPin = A0;
const byte ledPin = 4;
unsigned long timer = 0;
unsigned long tempDelay = 3000; // 3 seconds
unsigned int temp = 0;
unsigned int tempThreshold = 512;
void setup()
{
Serial.begin(115200);
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, HIGH); //common anode led off
}
void loop()
{
if(millis() - timer >= tempDelay)
{
// if it gets here temp is ovet 512 for 3 seconds
digitalWrite(ledPin, LOW);
}
else
{
digitalWrite(ledPin, HIGH);
}
temp = analogRead(analogInPin);
if(temp < tempThreshold)
{
timer = millis(); //reset timer
}
}