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.
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#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);
}
4 Comments
Christopher Stapels
on 21 Mar 2024
Edited: Christopher Stapels
on 21 Mar 2024
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?
Answers (1)
Christopher Stapels
on 21 Mar 2024
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.
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