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Topic: Problem running code using Dallastemperature and OneWire (Read 281 times) previous topic - next topic


Hi Everyone,

I have an Arduino Uno board, DallasTemperature sensors, OneWire, and LCD that I am using to display the temperature at a device continuously (in 1000 ms increments, one device at a time) until the button is depressed, which increments to the next device to be read and displayed by the LCD. However, the combination of code and hardware I am using results in occasionally reading 85 C if I heat the device by hand; also, I found that when I depress the button, the loop will sometimes execute
if (digitalRead(13)==0)
multiple times. Sometimes just once, sometimes twice, sometimes 3 times. I'm not sure (other than possible hardware issues) why this is happening. 

I've attached the code (temperature1_v3) and eliminated hardare issues (I believe). I've also attached previous working code (temperature1) that operated without these errors but didn't continuously read temperature from a single device (hence temperature1_v3).

Thanks for reading and the possible help!



Jul 17, 2015, 08:38 pm Last Edit: Jul 17, 2015, 08:45 pm by robtillaart
pin 13 also has the LED connected, might be a problem cause

furthermore the use of delay() blocks the execution of the code

you might try this variation
Code: [Select]
void loop(void)
  Serial.print("Requesting temperatures...");
  for(int i=0;i<device_count;i++)
  if (digitalRead(13)==0)
     if (counter>=device_count) counter=0;

     float tempC = sensors.getTempC(devices[counter]);
     lcd.print(" Temp C: ");
     delay(1000); //Do not poll too fast

Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

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