-127 Do not display

Need Help With My Project
1

Hello, tell me how to remove the display -127 in the blink, so that if the connection was interrupted, the previous values ​​remained, or at least “0”
q86-a26u-KM

2

-127 it means your sensor not work well. Go check wiring first

3

If you search the forum for the sensor you are using and/or “-127” you’ll see many examples of code to catch these rogue values.
I seem to recall that one of the posts said that changing the library solved the problem, and I think they provided details of the library they used - but you’ll see all this when you search.

Pete.

4

I assume you are using dallas sensor :thinking:
You can store the value when >0 and use it each time value is <0
I use that solution when I get a “NAN” from DHT11.

5

for very basic usage

void sendSensor()
{ 
  sensors.requestTemperatures();
  temp = sensors.getTempCByIndex(0);
  if(temp==-127)
  {
    Serial.println("wrong value");
   }else{
    Blynk.virtualWrite(V0, String(temp, 2));
  }
}

but mostly if you add pullup resistor for dallas sensor data pin it will fix -127 value

6

I have a pull up on mine but I still get the odd -127 reading. One thing I did discover though but I cant prove it is that I had my temp sensor box positioned in one part of the house close to my aquarium, there I was getting a lot of -127 faults. I then moved the sensor box elsewhere and get much fewer fault readings. Could it be noise from the aquarium pumps?? Who knows

7

Is there a link to the topic?
yes, ds18b20

8

i am using ds18b20

9

thanks, I will try)