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  • Author Author: gam3t3ch
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Arduino Starter Kit - Love Meter with faster Reset

gam3t3ch 


So I was trying to figure out a decent way to speed up the time it took to reset I ended up taking another instance of the low being +2 
and then adding the first high-low-low as being 2.25 degrees I have added a few video's so you can see the results I am by far no means 
any good when it comes to messing with the arduino besides using other people code but since I got that kit let me tell you its be a great
adventure in the arduino land.image

//LOVE METER WITH FASTER RESET.
const int sensorPin = A0;const float baselineTemp = 22.0;
void setup(){   Serial.begin(9600); 
  for(int pinNumber = 2; pinNumber<5; pinNumber++){     
pinMode(pinNumber,OUTPUT);    
 digitalWrite(pinNumber, LOW);  
 }
} 
void loop(){  
 int sensorVal = analogRead(sensorPin);   
Serial.print("Sensor Value: ");   
Serial.print(sensorVal);   
float voltage = (sensorVal/1024.0) * 5.0;   
Serial.print(", Volts: ");   
Serial.print(voltage);  
Serial.print(", degrees C: ");  
float temperature = (voltage - .5) * 100;   
Serial.println(temperature);     
if(temperature < baselineTemp){     
digitalWrite(2, LOW);     
digitalWrite(3, LOW);     
digitalWrite(4, LOW);  
 }   
else if(temperature >= baselineTemp+2.25 && temperature < baselineTemp+4){     
digitalWrite(2, HIGH);     
digitalWrite(3, LOW);     
digitalWrite(4, LOW);   }   
else if(temperature >= baselineTemp+4 && temperature < baselineTemp+6){     
digitalWrite(2, HIGH);     
digitalWrite(3, HIGH);     
digitalWrite(4, LOW);   }   
else if(temperature >= baselineTemp+6){     
digitalWrite(2, HIGH);     
digitalWrite(3, HIGH);     digitalWrite(4, HIGH);   
}   
else if(temperature >= baselineTemp+2){     
digitalWrite(2, LOW);     
digitalWrite(3, LOW);     
digitalWrite(4, LOW);   
}   
delay(.25); 
}  



This code seemed to output the following for me which I didn't think to be ideal the above code tho 
Produced the below video here which I felt was better.  (was a bit cooler in the room when I did this bottom one
so test didn't light up all 3 but will give you a example of the drop at the end)


PLEASE POST BELOW IF THERE IS A BETTER CODE TO TRY. 
Will play with this more but more info is always appreciated.

  • It is fun to solve problems in software, but the truth here is that the problem exists in physics.  The 'reset' time has more to do with the heat that you have applied to the sensor and the time it takes for that heat to dissipate. To speed up your reset time you could use a small fan to blow ambient air across the sensor.  To do this you will need some code.  While the temperature is near ambient the fan needs to be off.  When the temperature is rising or holding the fan also needs to be off.  When the temperature is above ambient and is falling then the fan is turned on.  (Be careful to get a tiny fan that can be driven safely by the arduino and one that will no attack your fingers)

     

    Have fun, but be safe.

  • in reply to mcb1

    Thanks for the info, guess I gotta go shopping now...lol

  • They are addictive aren't they.

     

    //LOVE METER WITH FASTER RESET.
const int sensorPin = A0;const float baselineTemp = 22.0;
void setup(){   Serial.begin(9600); 
  for(int pinNumber = 2; pinNumber<5; pinNumber++){     
pinMode(pinNumber,OUTPUT);    
 digitalWrite(pinNumber, LOW);  
 }
} 
void loop(){  
 int sensorVal = analogRead(sensorPin);   
Serial.print("Sensor Value: ");   
Serial.print(sensorVal);   
float voltage = (sensorVal/1024.0) * 5.0;   
Serial.print(", Volts: ");   
Serial.print(voltage);  
Serial.print(", degrees C: ");  
float temperature = (voltage - .5) * 100;   
Serial.println(temperature);     
if(temperature < baselineTemp){     
digitalWrite(2, LOW);     
digitalWrite(3, LOW);     
digitalWrite(4, LOW);  
 }   
else if(temperature >= baselineTemp+2.25 && temperature < baselineTemp+4){     
digitalWrite(2, HIGH);     
digitalWrite(3, LOW);     
digitalWrite(4, LOW);   }   
else if(temperature >= baselineTemp+4 && temperature < baselineTemp+6){     
digitalWrite(2, HIGH);     
digitalWrite(3, HIGH);     
digitalWrite(4, LOW);   }   
else if(temperature >= baselineTemp+6){     
digitalWrite(2, HIGH);     
digitalWrite(3, HIGH);     digitalWrite(4, HIGH);   
}   
else if(temperature >= baselineTemp+2){     
digitalWrite(2, LOW);     
digitalWrite(3, LOW);     
digitalWrite(4, LOW);   
}   
delay(.25); 
}

     

    In your elseif statements, you are basically driving

    Pin 2 = + 2.25 deg

    Pin 3 = +4

    Pin 4 =+ 6

     

    You could seperate these into an if statement to just control that Pin based on the baseline +xx.

    eg High is it's above or low if it isn't.

     

    You could also do some averaging for achieving the baseline temperature, rather than the fixed 22 degs.

    You could read the temperature 5 or 10 times during the setup and then average it.

     

    I can see that you're wanting to work out the actual temperature from the ADC value.

    Correct me if my algebra is wrong, but I thought voltage = sensorVal * 5/1024, based on the fullscale ADC is 1024 which represents 5 volts (default value)

     

    Good example and explanantion is here.

    https://learn.adafruit.com/tmp36-temperature-sensor/using-a-temp-sensor

     

     

    There is another very useful command called Map, that allows translation from one set of values into a range.

     

     

    Personally I use the DS18B20's for temperature measurement ...

    I'd add a couple of the waterproof versions on your next buying trip.

     

    Mark