Blynk simple temperature sensor lm35

Projects made with Blynk
1

This simple sketch measure the temperature using an LM35 connected to analog pin 1 .
and showing the value from the virtual pin 10.

    #define BLYNK_PRINT Serial    // Comment this out to disable prints and save space
    #include <SPI.h>
    #include <Ethernet.h>
    #include <BlynkSimpleEthernet.h>
    #include <SimpleTimer.h>
    
    // You should get Auth Token in the Blynk App.
    // Go to the Project Settings (nut icon).
    char auth[] = "xxxxxxxxx";
    
    float temp;
    int tempPin = 1; //analog pin 1
    
    SimpleTimer timer;
    
    void setup()
    {
      Serial.begin(9600); // See the connection status in Serial Monitor
      Blynk.begin(auth);
    
      // Setup a function to be called every second
      timer.setInterval(1000L, sendUptime);
    }
    
    // that you define how often to send data to Blynk App.
    void sendUptime()
    {
     // shows the value temp on virtual pin 10
      Blynk.virtualWrite(10, temp); 
    }
    
    void loop()
    {
      Blynk.run(); // Initiates Blynk
      timer.run(); // Initiates SimpleTimer
      
       temp = analogRead(tempPin);
       temp = temp * 0.48828125;  
      
    }
5 Likes
2

Just what ive been looking for and it works! Thanks. Any tips on how to convert to degrees??

3

Yes, subtract 32 from the Fahrenheit and divide that by 1,8. That will give you Celsius :slight_smile:

4

LM35 output is already in Centigrade no need to convert.

5

LM35 topic is already in retrograde no need to fix :stuck_out_tongue:

Please take note of the time/date stamps before responding to posts… anything over 6+ months is probably not worth reviving.

Thank you.

6