How to get the right value from analog ph meter displayed in Blynk?

Need Help With My Project
1

Hello guys,I’m a newbie to Blynk.I want to read right value from my analog ph meter(https://www.robotshop.com/en/gravity-analog-ph-meter-kit.html).Could you help me please?
P.S. I’m using ESP8266 connecting to Blynk.
Here is my code and my wrong ph value result.

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#define BLYNK_PRINT Serial    // Comment this out to disable prints and save space
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>

#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>

#define DHTPIN            2    
#define DHTTYPE           DHT22

DHT_Unified dht(DHTPIN, DHTTYPE);

char auth[] = "auth";

SimpleTimer timer;

void setup()
{
  Serial.begin(9600);
  Blynk.begin(auth, "wifi", "password");

  dht.begin();
  
  // Setup a function to be called every second
  timer.setInterval(1000L, sendUptime);
}

void sendUptime()
{
  Blynk.virtualWrite(V5, millis() / 1000);
  sensors_event_t event;  
  dht.temperature().getEvent(&event);
  if (!isnan(event.temperature)) {
    Blynk.virtualWrite(V1, event.temperature);
  }
  dht.humidity().getEvent(&event);
  if (!isnan(event.relative_humidity)) {
    Blynk.virtualWrite(V2, event.relative_humidity);
  }
}

void loop()
{
  Blynk.run();
  timer.run();
}
2

As per the directions you deleted in order to post this… I fixed your posted code formatting :wink:

Your code does not appear to be sending any output to the display widget you refer to as PH… so how can we determine what you are doing wrong? :stuck_out_tongue_winking_eye:

Sending raw “data” (actually just a voltage level) to an Analog pin will get you RAW values… ranging from 0-1023, based on the 0-3.3v input… basically normal. Whatever sensor you are using probably needs code to translate the true value.

1 Like
3

Thank you so much for your attention.Your word made me understand what I should do. :sweat_smile:

4

https://www.robotshop.com/media/files/pdf2/rb-dfr-483.pdf

Look at the PDF for that sensor… there is some example code in there that should do the conversion… then set your Display Widget to a virtual pin and send your translated Analog data to it via a **Blynk.virtualWrite(vPin, value)** just like the others.

5

Have you completed the code? I,m using this exact sensor, do you mind sharing with me?

6

Just completed this. If you still have issues, tell me.

7

Hey, just came across this old thread. Can you share the code for this? I’m using esp8266 with Blynk and trying to add this ph sensor as well. Thanks!

8

Don’t forget to buy some ph calibration powder as well if you haven’t already…
Eg. (http://www.discountinstruments.com.au/ph-calibration-powder-3-pack.html?fee=1&fep=29&gclid=Cj0KCQjw1NzZBRCoARIsAIaMwuuu8WxYa7Yu27dfgnTRZZ2RNXpXMEfLUncpk8HPbIWYnfHwQOM8K6caApAhEALw_wcB)

9

can you share the right code? thanks so much.

10

Closing this old topic… over the last year, three different users asked for the apparently non-existent code, but the OP has not answered.