Thingspeak (via ESP8622) is not showing any graphical data from 3 Fields.

Hi

i'm trying to send data on thinkspeak for 3 fields. But thingspeak is not showing any graphical representation despite entries.

I reduced the update time to 10 and still didn't get anything

This is my code:

//Include the ESP8266 WiFi library.

#include <ESP8266WiFi.h>

//Local Network Settings.

char ssid[] = "AndroidAP5723"; // your network SSID (name)

char pass[] = "hookuyte"; // your network password

const byte buttonPin = 4;

const byte potentiometerPin = A0;

char thingSpeakAddress[]= "api.thingspeak.com";// Host address URL

String APIKey = "**************";//Blanked out for security reasons

const int updateThingSpeakInterval = 20 * 1000;// every 20 secs

//Initialize wifi client

WiFiClient client;

void setup() {

//Set the baud rate for Serial Communication

Serial.begin(115200);

delay(2000);

//Display what SSiD you are connecting to.

Serial.println();

Serial.print("Connecting to ");

Serial.println(ssid);

//Connect to the Access.

WiFi.begin(ssid,pass);

//Now we establish a connection to the access point

while(WiFi.status()!= WL_CONNECTED)

{

delay(500);

Serial.print(".");

}

}//Close setup

void loop() {

//Read Sensor Data

int potentiometerReading = analogRead(potentiometerPin);

boolean buttonReading = digitalRead(buttonPin);

//Convert sensor data into String objects

String potentiometerField = String(potentiometerReading);

String buttonField = String(buttonReading);

String randomNumberField = String(random (0, 42));

/* Concatenate the field into one string object

* which we can send as the Message body

*/

String thingSpeakData = "field1=" + potentiometerField+ "&field2=" + buttonField + "&field3=" + randomNumberField;

//Establish a connection with ThingSpeak

if(client.connect(thingSpeakAddress, 80)){

//Send the Message Start-Line (Method URI protocolVersion).

client.println("POST /update HTTP/1.1");

//Send the HTTP Header Field

client.println("Host: api.thingspeak.com");

client.println("Connection: close");

client.println("X-THINGSPEAKAPIKEY: " + APIKey);

client.println("Contect-Type: application/x-www-form-urlencoded");

client.print("Content-Lenght: ");

client.println(thingSpeakData.length());

client.println();// Header fields are complete

//Send Message Body

client.print(thingSpeakData);

//check if connection to thingSpeak was established

if (client.connected()){

Serial.println("Connected to thingSpeak.");

Serial.println();

}

//Display info to Serial Monitor for troublShooting

Serial.print("Potentiometer [Field 1]= " );

Serial.print(potentiometerField);

Serial.print(" Button [Field 2] = " );

Serial.print(buttonField);

Serial.print(" Random [Field 3] = " );

Serial.print(randomNumberField);

delay(updateThingSpeakInterval);

}

}

Answer 1

[Vinod]

I strongly recommend using the ThingSpeak library and starting from the examples provided with it.

[Nathan Garpiya]

I completed the "Write" example and it was okay.

I am a bit confused with this part of the code:

int x = ThingSpeak.writeField(myChannelNumber, 1, number, myWriteAPIKey);

// Check the return code

if(x == 200){

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

}

else{

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

}

I don't get the "return code" bit.

[Christopher Stapels]

That section checks the HTTP return code to make sure the request was successful.