here is the code for interfacing esp8266 with ARDUINO UNO atmega328 to upload sensor data to THINGSPEAK API.
#include <SoftwareSerial.h>
#define RX 10
#define TX 11
String AP = "xxxxxxxxxxx"; // CHANGE ME
String PASS = "xxxxxxxxxxx"; // CHANGE ME
String API = "xxxxxxxxxxxxxxxx"; // CHANGE ME
String HOST = "api.thingspeak.com";
String PORT = "80";
String field = "field1";
int countTrueCommand;
int countTimeCommand;
boolean found = false;
int valSensor = 1;
SoftwareSerial esp8266(RX,TX);
void setup() {
Serial.begin(9600);
esp8266.begin(9600);
sendCommand("AT",5,"OK");
sendCommand("AT+CWMODE=1",5,"OK");
sendCommand("AT+CWJAP=""+ AP +"",""+ PASS +""",20,"OK");
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}
void loop() {
valSensor = getSensorData();
String getData = "GET /update?api_key="+ API +"&"+ field +"="+String(valSensor);
sendCommand("AT+CIPMUX=1",5,"OK");
sendCommand("AT+CIPSTART=0,"TCP",""+ HOST +"","+ PORT,15,"OK");
sendCommand("AT+CIPSEND=0," +String(getData.length()+4),4,">");
esp8266.println(getData);
Serial.println(getData);
delay(1500);
countTrueCommand++;
sendCommand("AT+CIPCLOSE=0",5,"OK");
}
int getSensorData(){
return random(1000); // Replace with your sensor program
}
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);//at+cipsend
if(esp8266.find(readReplay))//ok
{
found = true;
break;
}
countTimeCommand++;
}
if(found == true)
{
Serial.println("OK");
countTrueCommand++;
countTimeCommand = 0;
}
if(found == false)
{
Serial.println("Fail");
countTrueCommand = 0;
countTimeCommand = 0;
}
found = false;
}