Overview
Things
Story

Arduino Set-up
Write code

Published December 26, 2022 © GPL3+

Sending Data to Cloud

This project will guide to send an analogue data (potentiometer reading at analogue A0) to the cloud using thingspeak.

IntermediateFull instructions provided111

Things used in this project

Hardware components

Breadboard (generic)

Jumper wires (generic)

Male/Female Jumper Wires

Espressif ESP8266 ESP-01

Arduino UNO

USB-A to B Cable

Single Turn Potentiometer- 10k ohms

Hand tools and fabrication machines

Extraction Tool, 6 Piece Screw Extractor & Screwdriver Set

Optional / Can use any other screw drivers to turn the potentiometer

Story

ThingspeakSet-up

thingspeak.com is an IoT analytics platform service that allows you to aggregate, visualize, and analyze live data streams in the cloud. You can send data to ThingSpeak from your devices, create instant visualization of live data, and send alerts.

First, register an account in thingspeak. https://thingspeak.com/

Once successfully created the account, create a new channel by click the New Channel button on top left.

Then key in required information.

Name field1: pot1

Once created, then you can get your API Key by click "API Keys".

Copy your link in "Write a Channel Feed". For example....

GET https://api.thingspeak.com/update?api_key=XXXXXXXXXXXXX&field1=0

Arduino Set-up

Connect potentiometer (10K) to the Arduino Analogue Input (A0) as shown in figure 1.

Write / copy code1. Run the code

Display the potentiometer reading in Serial Monitor

Adjust the potentiometer using screw drive and monitor the changes in Potentiometer reading.

In this program we just use ADC value which give 1023 at highest resistance and 0 at lowest resistance.

ConnectESP8266

Now connect WIFI module ESP8266 to the existing circuit as shown in figure 2.

Connect CH_PD and Vcc to 3.3V (or 5.0V).

Connect Rx to Pin 10, Tx to Pin 11, Gnd to Gnd and RSTtoSwitch1.

Please refer to my previous lesson if you wants to do ESP8266 setup. Watch 
out there is some differences in the circuit diagram. 

https://create.arduino.cc/projecthub/mkganesan1975/wifi-module-esp8266-initializing-d62f11?ref=user&ref_id=2304769&offset=1

Once the ESP8266 setup is successful, then rearrange the circuit as in 
figure2.

Write code

Now write code as shown in Code2

In this code, I make a separate header file for my secrete values. You can just directly write your secret value in the same program (if not good in creating header file).

String AP = "gvm2.4GHz"; //your wifi Access Point Name
String PASS = "mypass"; //your AP password
String API = "ASKAJDBSADU56161"; //This code you get from thinkspeak
String HOST = "api.thingspeak.com"; 
String PORT = "80";

If ThingSpeak library is not available then download it:

At the top of Arduino IDE
- Go to Tools > Manage Libraries ....
- Type thingspeak at search box
- Select ThinkSpeak by MathWork

Code

#include <ThingSpeak.h>
#include <SoftwareSerial.h>
#include "arduino_secrets.h"

#define RX 11
#define TX 10

String AP = SECRET_AP;
String PASS = SECRET_PASS;
String API = SECRET_API;
String HOST = SECRET_HOST;
String PORT = SECRET_PORT;

String field = "phvalue";

int countTrueCommand;
int countTimeCommand; 
boolean found = false; 
int valSensor = A0;

SoftwareSerial esp8266(RX,TX); 
  
void setup() {
  Serial.begin(9600);
  esp8266.begin(115200);
  sendCommand("AT",5,"OK");
  sendCommand("AT+CWMODE=1",5,"OK");
  sendCommand("AT+CWJAP=\""+ AP +"\",\""+ PASS +"\"",20,"OK");
}

void loop() {
 
 valSensor = getSensorData();
  String getData = "GET https://api.thingspeak.com/update?api_key=NKPNJFC389G2XEIL&field1=0" + String(valSensor);
 sendCommand("AT+CIPMUX=1",5,"OK");
 sendCommand("AT+CIPSTART=0,\"TCP\",\"" + HOST + "\"," + PORT,3,"OK");
 sendCommand("AT+CIPSEND=0," + String(getData.length()+4),3,">");
 esp8266.println(getData);
 delay(100);
 countTrueCommand++;
 sendCommand("AT+CIPCLOSE=0",3,"OK");
}

int getSensorData(){
  return analogRead(A0);
}

void sendCommand(String command, int maxTime, char readReplay[]) {
  Serial.print(countTrueCommand);
  Serial.print(". at command => ");
  Serial.print(command);
  Serial.print(" ");
  while (countTimeCommand < (maxTime*1)) {
    esp8266.println(command);
    if (esp8266.find(readReplay)) {
      found = true;
      break;
    }
    countTimeCommand++;
  }

  if (found == true) {
    Serial.println("Pass");
    countTrueCommand++;
    countTimeCommand = 0;
  }
  
  if (found == false) {
    Serial.println("Fail");
    countTrueCommand = 0;
    countTimeCommand = 0;
  }
  found = false;
}

Credits

mkganesan1975

2 projects • 1 follower

Sending Data to Cloud

Things used in this project

Hardware components

Hand tools and fabrication machines

Story

Arduino Set-up

Write code

Schematics

Figure 1: Analogue Input

Figure 2: Full Circuit Diagram

Code

Code 1: display potentiometer reading

Code 2: Send Data to Cloud

Credits

mkganesan1975

Comments

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Sending Data to Cloud

Sending Data to Cloud

Things used in this project

Hardware components

Hand tools and fabrication machines

Story

Arduino Set-up

Write code

Schematics

Figure 1: Analogue Input

Figure 2: Full Circuit Diagram

Code

Code 1: display potentiometer reading

Code 2: Send Data to Cloud

Credits

mkganesan1975

Comments

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