The only thing i could find is something like this.
Magician:
I'll calculate average "1 hours" value, summing up 12 digit and divide a sum by 12. S(i) = ( T1 + T2 +....+T12 ) / 12.
Than trend is a differential of two S, current and previous:
if ( S(i-1) > S(i) ) trend = "Down";
if ( S(i-1) < S(i) ) trend = "Up";
if ( S(i-1) == S(i) ) trend = "Steady";
But i cannot put it in the perspective ofvariables ...
Well, first you need to determine how fast the temperature can change 1 degree C. That tells you how often you need to check the temperature value. Then each time period, compare the new temperature to the previous temperature. If old temp < new temp, then temp is going up. If old temp > new temp, then temp, then temp is going down. After comparing, move new temp value to old temp value.
How are you measuring T ?
Make an array where you store some values. Apply required delay between each T measure.
Calculate the slope of T.
To implement you can use the idea for blink without delay ...a state machine
Hi,
I wrote small routine that will do what I thinking it is what you are looking for. The only you need to do it is add the temperature variable and see it is work. Again I do not know if this is what you are looking.
byte pinxx = 0;//turn on mchine pin output
int T ; //temperature variable
void setup() {
// put your setup code here, to run once:
pinMode(pinxx , OUTPUT); //nachine turn on pin
}
void loop() {
// put your main code here, to run repeatedly:
//instruction here to get the temperature T=xxxx
if (T >= 1) {
temp_falling(); //wait until temperature reach 1 degree +
}
delay(1000);
}
//***************************************************
void temp_falling() {
digitalWrite(pinxx, HIGH); //turn the machine ON
do {
//loop here until temperature drop to -5
//instruction to get the temperature T= xxxx
} while (T < -4);
digitalWrite(pinxx, LOW); //turn the machine OFF
}
//****************************************************
char status;
double T,P,p0,a;
Serial.println(T);
//check to see the state of the float switches.
//empty
if ((digitalRead(Startup_Pin) == HIGH) &&
(digitalRead(Safety_Pin) == HIGH) &&
(digitalRead(Vaccum_relay_Pin) == HIGH) && //vaccum has to be off to start
((T) > 1)
)
{
digitalWrite(Pump_relay_Pin, HIGH); //Keep pump off
digitalWrite(Vaccum_relay_Pin, LOW); //Start Vacuum
Serial.println("empty, vaccum started");
}
//startup
if ((digitalRead(Empty_Pin) == LOW) &&
(digitalRead(Startup_Pin) == LOW) &&
(digitalRead(Safety_Pin) == HIGH)
)
{
digitalWrite(Pump_relay_Pin, LOW); //start pump
digitalWrite(Vaccum_relay_Pin, LOW); //Keep vacuum running
Serial.println("Pumping");
}
//safety shut-off
if (digitalRead(Safety_Pin) == LOW)
{
digitalWrite(Vaccum_relay_Pin, HIGH); //shut the vacuum off!
digitalWrite(Pump_relay_Pin, LOW); //keep pump running for:
Serial.println("ERREUR EXTRACTEUR!");
delay(90000);
digitalWrite(Pump_relay_Pin, HIGH); //shut off the pump
delay(500000000000000);
}
// temperature shut off
if (((T) < -5) &&
(digitalRead(Vacuum_relay_Pin) == LOW))
{
digitalWrite(Vaccum_relay_Pin, HIGH); //shut the vacuum off!
digitalWrite(Pump_relay_Pin, HIGH); //shut off the pump
Serial.println("toute a OFF Trop frette!");
}
if (((T) > 20) &&
(digitalRead(Vacuum_relay_Pin) == LOW))
{
digitalWrite(Vaccum_relay_Pin, HIGH); //shut the vacuum off!
digitalWrite(Pump_relay_Pin, HIGH); //shut off the pump
Serial.println("toute a OFF Trop chaud!");
}
I have added
if ((digitalRead(Startup_Pin) == HIGH) &&
(digitalRead(Safety_Pin) == HIGH) &&
(digitalRead(Vaccum_relay_Pin) == HIGH) && //vaccum has to be off to start
((T) > 1)
)
{
digitalWrite(Pump_relay_Pin, HIGH); //Keep pump off
digitalWrite(Vaccum_relay_Pin, LOW); //Start Vacuum
Serial.println("empty, vaccum started");
}
and
// temperature shut off
if (((T) < -5) &&
(digitalRead(Vacuum_relay_Pin) == LOW))
{
digitalWrite(Vaccum_relay_Pin, HIGH); //shut the vacuum off!
digitalWrite(Pump_relay_Pin, HIGH); //shut off the pump
Serial.println("toute a OFF Trop frette!");
}
if (((T) > 20) &&
(digitalRead(Vacuum_relay_Pin) == LOW))//
{
digitalWrite(Vaccum_relay_Pin, HIGH); //shut the vacuum off!
digitalWrite(Pump_relay_Pin, HIGH); //shut off the pump
Serial.println("toute a OFF Trop chaud!");
}
// temperature variables
if (((T) < -5) &&
(digitalRead(Vaccum_relay_Pin) == LOW)); // vaccum has to be on to shut off
{
digitalWrite(Vaccum_relay_Pin, HIGH); //shut the vacuum off!
digitalWrite(Pump_relay_Pin, LOW);
delay(90000);
digitalWrite(Pump_relay_Pin, HIGH); //shut off the pump
Serial.println("toute a OFF Trop frette!");
}
if (((T) > 20) &&
(digitalRead(Vaccum_relay_Pin) == LOW)); //vaccum has to be on to shut off
{
digitalWrite(Vaccum_relay_Pin, HIGH); //shut the vacuum off!
digitalWrite(Pump_relay_Pin, HIGH); //shut off the pump
Serial.println("toute a OFF Trop chaud!");
}
if (((T) > -1) &&
(digitalRead(Vaccum_relay_Pin) == HIGH)); //vaccum has to be OFF to start
{
digitalWrite(Vaccum_relay_Pin, LOW); //turn on the vacuum
Serial.println("vacuum parti");
}
Where does the pump get turned back on when T>-1?
Why is there no delay time on the pump turn off at hight temp but there is at low?
I think I also need help in understanding a few issues my code has.
I think I might have found a few like these:
if the manifold wasn't empty, then the compressor wouldn't start.
ive put this in the setup :
if (digitalRead(Empty_Pin) == LOW) // if the manifold is not empty
{
digitalWrite(Pump_relay_Pin, LOW); //empty the manifold
}
else
{
digitalWrite(Pump_relay_Pin, HIGH);
}
i removed the vaccum starting from the liquid level variables.
safety is the only level that should make the vacuum turn off
if (((T) <= -5 ) &&
(digitalRead(Vaccum_relay_Pin) == LOW)) // vaccum has to be on to shut off
{
digitalWrite(Vaccum_relay_Pin, HIGH); //shut the vacuum off!
digitalWrite(Pump_relay_Pin, HIGH); //shut off the pump
Serial.println("toute a OFF Trop frette!");
}
or
if (((T) <= -5 ) &&
(digitalRead(Vaccum_relay_Pin) == 0)) // vaccum has to be on to shut off
{
digitalWrite(Vaccum_relay_Pin, HIGH); //shut the vacuum off!
digitalWrite(Pump_relay_Pin, HIGH); //shut off the pump
Serial.println("toute a OFF Trop frette!");
}
