DATA NOT PLOTING VIA SERIAL AND THINGSPEAK

[sensorvice]

Good day,

Can you assist with the following code, my results are not plotting via serial port and not posting to the thingSpeak channel. However when I comment out all the lines related to ThingSpeak , I am able to get the data via serial port.

I would appreciate if anyone would be able to pick up from my code what would be the problem.

Thank you all as you take your time to assist.

#include <PID_v1.h>
#include <SPI.h>
#include <Ethernet.h>
#include "ThingSpeak.h"

byte mac[] = { 0xBB, 0xBB, 0xBB, 0xBB, 0xBB, 0xCC}; //ETHERNET SHIELD MAC ADRESS
EthernetClient client;

unsigned long myChannelNumber = xxxxxxx; //ThingSpeak Channel ID
const char * myWriteAPIKey = "xxxxxxxxxxxxx"; //PRIVATE WRITE KEY to ThingSpeak

#define PIN_INPUT 0
#define PIN_OUTPUT 3
int data;

//Define Variables we'll be connecting to

double Setpoint, Input, Output;

//Specify the links and initial tuning parameters

double Kp = 5, Ki = 1, Kd = 0.5;
PID myPID(&Input, &Output, &Setpoint, Kp, Ki, Kd, REVERSE);

void setup()
{
  pinMode(PIN_OUTPUT, OUTPUT);
  pinMode(PIN_INPUT, INPUT);

  //initialize the variables we're linked to
  Input = analogRead(PIN_INPUT);
  Setpoint = 30;
  Ethernet.begin(mac);
  ThingSpeak.begin(client);
  Serial.begin(9600);
  delay(1000);

  //turn the PID on
  myPID.SetMode(AUTOMATIC);
}

void loop()
{

  Input = (5.0 * analogRead(PIN_INPUT) * 100.0) / 1024.0; //Converting to °C

  myPID.Compute(); //applying PID tuning
  analogWrite(PIN_OUTPUT, Output);

  Serial.print("Temperature: ");
  Serial.println(Input);
  data = Input;


  ThingSpeak.writeField(myChannelNumber, 1, data, myWriteAPIKey);
  ThingSpeak.setField(1, data);
  delay(1000);

}

[StefanL38]

thingsSpeak accepts sending data only once every 20 seconds.

Have you checked the baudrate of the serial monitor?

best regards Stefan

[sensorvice]

Thanks for response, yes the baudrate of serial monitor is correct on 9600, hence I have mentioned that once I comment out all the code related to ThingSpeak the serial monitor works, strange.

I will change my delay to 20 seconds to see if it works and give feedback thank you.

[sensorvice]

I have changed the delay, unfortunately still nothing comes out and I suspect the sensor is not even reading the temperature.

When I upload and run the code below, it works perfectly well and I can see the plot on serial,

// AutoPID - Version: Latest 
#include <PID_v1.h>
#include <SPI.h>
#include <Ethernet.h>

#define PIN_INPUT 0
#define PIN_OUTPUT 3
int data;

//Define Variables we'll be connecting to
double Setpoint, Input, Output;

//Specify the links and initial tuning parameters
double Kp =5, Ki = 1, Kd = 0.5;
PID myPID(&Input, &Output, &Setpoint, Kp, Ki, Kd, REVERSE);

void setup()
{
  pinMode(PIN_OUTPUT, OUTPUT);
  pinMode(PIN_INPUT, INPUT);

  //initialize the variables we're linked to
  Input = analogRead(PIN_INPUT);
  
  Setpoint = 30;
  
  Serial.begin(9600);
  delay(1000);

  //turn the PID on
  myPID.SetMode(AUTOMATIC);
}

void loop()
{

  Input = (5.0 * analogRead(PIN_INPUT) * 100.0) / 1024.0; //Converting to °C

  myPID.Compute(); //applying PID tuning
  
  analogWrite(PIN_OUTPUT, Output);

  Serial.print("Temperature: ");
  Serial.println(Input);
  data = Input;

  delay(1000);
}

the problem starts when I attempt to send data to the ThingSpeak, then it does nothing .