pH Sensor & ESP32

Official Hardware Nano Family Nano ESP32
1

1
1836×750 45.1 KB

i want to calibrate my pH sensor but it doesnt change

Please can anyone help?? it's a hardware or code problem?

2

You haven't shown your calibration code.

Please see the pinned post "How to get the best out of this forum" for how to properly post source code - not as a screenshot.

3

You havent shown or provided links to your hardware.
You should post your code as text not as a picture - we cant load a picture.
Use "copy for forum" in the IDE

I dont believe a ph of 13.2

This site

has this code


  avgValue=0;
  for(int i=2;i<8;i++)                      //take the average value of 6 center sample
    avgValue+=buf[i];
  float phValue=(float)avgValue*5.0/1024/6; //convert the analog into millivolt
  phValue=3.5*phValue;                      //convert the millivolt into pH value
  Serial.print("    pH:");  
  Serial.print(phValue,2);
  Serial.println(" ");
4

Sorry i'm new member here.. this my code

int pH_Value; 
float Voltage;
 
void setup() 
{ 
  Serial.begin(9600);
  pinMode(pH_Value, INPUT); 
} 
 
void loop() 
{ 
  pH_Value = analogRead(A0); 
  Voltage = pH_Value * (3.3 / 1023.0); 
  Serial.println(Voltage); 
  delay(500); 
}
6

Again, there is nothing in there to do calibration?

Surely, your sensor must have instructions on how to do its calibration - so follow those?

This seems backwards: surely, the analogRead() gives you a voltage*, and you want to convert that to a pH value?

* well, a number that represents a voltage.

7

ohh i see... Can you give me a link/tutorial to calibrate a ph sensor..
cause i saw a tutorial from youtube like this https://youtu.be/3_w4GhrEoQ8

8

Again, wasn't that information provided with whatever mystery sensor you have?

As @johnerrington said, please post a link to your hardware - including the pH sensor.

Also post your schematic, and some good, clear photos of your setup.

Did you look at the article @johnerrington linked?