I want to send my ultrasonic sensor data on thing speak through arduino programming using esp32 microcontroller . but it is not sending the data on thingspeak.

#include <WiFi.h>
#include "ThingSpeak.h"

const char* ssid = "Redmi";     // your network SSID (name) 
const char* password = "kavita12";  // your network password
WiFiServer server(80);
WiFiClient client;
//char* myChannelID = "2475720";
unsigned long myChannelnumber = 2;
char *myWriteAPIKey = "xxxxxxxxxxx";
//unsigned long lastTime = 0;
//unsigned long timerDelay = 30000; // Interval between each data send attempt
int triggerPin = 19;
int echoPin = 18;

void setup() {
Serial.begin(921600); // Initialize serial communication
WiFi.mode(WIFI_STA);  // Set WiFi mode to station mode

pinMode(triggerPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial.println("Attempting to connect to WiFi...");
WiFi.begin(ssid, password);

//int attempts = 0;
while (WiFi.status() != WL_CONNECTED ) 
    {
        delay(5000); // Wait 5 seconds before retrying
        Serial.println("Retrying WiFi connection...");
        
        }
    
    if (WiFi.status() == WL_CONNECTED) 
        {
            Serial.println("Connected to WiFi.");
            } 
    else
        {
            Serial.println("Failed to connect to WiFi.");
            }
        server.begin();
        ThingSpeak.begin(client); 
        }
        
        void loop() 
        {
            digitalWrite(triggerPin, LOW);
            delayMicroseconds(10);
            digitalWrite(triggerPin, HIGH);
            delayMicroseconds(10);
            digitalWrite(triggerPin, LOW);
            
            int pingTravelTime = pulseIn(echoPin, HIGH);
            delay(500);
            
            float pingTravelDistance = pingTravelTime * 0.0343 / 2;
            Serial.print("Distance to target: ");
            Serial.print(pingTravelDistance);
            Serial.println(" cm");
            ThingSpeak.setField(1,pingTravelDistance );
            //int x = ThingSpeak.writeField(myChannelID, 1, pingTravelDistance, myWriteAPIKey);
            int x = ThingSpeak.writeFields(myChannelnumber, myWriteAPIKey);
            
            if (x == 200) 
            {
                Serial.println("Channel update successful.");
                } 
            else 
                {
                    Serial.println("Problem updating channel. HTTP error code " + String(x));
                    }
                //lastTime = millis();
                delay(10000);
                }

[Christopher Stapels]

Are you getting any messages from the code on your serial monitor?

Are you able to update the channel via web browser address bar?

If you are able to update your channel via the browser, I reccomend sending a constant value from your code instead of the ping sonar value. Then you can make sure you communicatoin with ThingSpeak is correct, and then work on the sonar part.

[kavita]

yes sir code is running and wifi is also connecting .but thingspeak is not connecting.

[Christopher Stapels]

are you seing wither of these messages?

"Channel update successful."

"Problem updating channel. HTTP error code " + String(x)

?

Are you able to update the channel via web browser address bar?

[kavita]

#include <WiFi.h>

#include <ThingSpeak.h>

#include<WiFiClient.h>

// WiFi credentials

const char* ssid = "Redmi";

const char* password = "kavita12";

// ThingSpeak parameters

const char* thingSpeakAddress = "api.thingspeak.com";

const char* apiKey = "EQO13SE8NXF1BNEY";

const unsigned long channelNumber = 2480606;

// Pin connected to the sensor

int triggerPin = 19;

int echoPin = 18;

WiFiServer server(80);

WiFiClient client;

void setup() {

Serial.begin(921600);

connectToWiFi();

pinMode(triggerPin, OUTPUT);

pinMode(echoPin, INPUT);

}

void loop() {

// Read sensor data

digitalWrite(triggerPin, LOW);

delayMicroseconds(10);

digitalWrite(triggerPin, HIGH);

delayMicroseconds(10);

digitalWrite(triggerPin, LOW);

int pingTravelTime = pulseIn(echoPin, HIGH);

delay(500);

int pingTravelDistance = pingTravelTime * 0.0343 ;

Serial.print("pingTravelDistance :");

Serial.print(pingTravelDistance);

float distancetotarget = pingTravelDistance/2;

Serial.print("Distance to target: ");

Serial.print(distancetotarget);

Serial.println(" cm");

// Send data to ThingSpeak

sendToThingSpeak(pingTravelDistance);

// Update every 15 seconds

delay(15000);

}

void connectToWiFi() {

Serial.println("Connecting to WiFi");

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(1000);

Serial.println("Connecting...");

}

Serial.println("Connected to WiFi");

}

void sendToThingSpeak(int data) {

ThingSpeak.begin(client); // Initialize ThingSpeak

// Convert the integer data to a String

// Create a new entry on the ThingSpeak channel

ThingSpeak.writeField(channelNumber, 1, data, apiKey);

// Check for successful update

if (ThingSpeak.getLastReadStatus() == 200) {

Serial.println("Channel update successful.");

} else {

Serial.println("Problem updating channel. HTTP error code " + String(ThingSpeak.getLastReadStatus()));

}

}

now channel update successfull but still data is not showing on thingspeak pingTravelDistance :16Distance to target: 8.00 cm

Channel update successful.

pingTravelDistance :40Distance to target: 20.00 cm

Channel update successful.

pingTravelDistance :16Distance to target: 8.00 cm

Channel update successful.

pingTravelDistance :16Distance to target: 8.00 cm

Channel update successful.

pingTravelDistance :16Distance to target: 8.00 cm

Channel update successful.

pingTravelDistance :40Distance to target: 20.00 cm

Channel update successful.

pingTravelDistance :40Distance to target: 20.00 cm

Channel update successful.

pingTravelDistance :40Distance to target: 20.00 cm

result is like that. is there another type of setting are require on thingspeak because i wrote proper channelid and api key etc

Answer 1

[Christopher Stapels]

Please try writing using the browser once so there is at least some data in your channel. See the api keys tab of your channel for the syntax to write a single value to your channel.

I would not use .getLastReadStatus() to check the update.

Try to read the value for .writefield for error checking as in the library examples. Then we might be able to see what is actually happening.