Hi, I want to send arduino temperatur and humidity from a DHT11 to thinkspeak with esp8266.
I follow the instruction from - YouTube
but when I open the serial monitor I can see :
Setup completed
Temp=27.00 *C
Humidity=47.00 %
AT+CIPSTART="TCP","184.106.153.149",80
AT+CIPSEND=66
AT+CIPCLOSE
And i can received anythink on thinkspeak
What's wrong ?
here's the code :
/* Arduino+esp8266 thingSpeak example
- Example name = "Write temperature and humidity to Thingspeak channel"
- Created by Ilias Lamprou
- Updated Oct 30 2016
- Download latest Virtuino android app from the link:https://play.google.com/store/apps/details?id=com.virtuino_automations.virtuino&hl
- Video tutorial link: - YouTube
- Contact address for questions or comments: iliaslampr@gmail.com
*/
// Code to use SoftwareSerial
#include <SoftwareSerial.h>
SoftwareSerial espSerial = SoftwareSerial(2,3); // arduino RX pin=2 arduino TX pin=3 connect the arduino RX pin to esp8266 module TX pin - connect the arduino TX pin to esp8266 module RX pin
#include <DHT.h> //Attention: For new DHT11 version library you will need the Adafruit_Sensor library
//Download from here: GitHub - adafruit/Adafruit_Sensor: Common sensor library
//Attention: For new DHT11 version libraries you will need the Adafruit_Sensor library
//Download from here:GitHub - adafruit/Adafruit_Sensor: Common sensor library
//and install to Arduino software
#define DHTPIN 5 // Connect the signal pin of DHT11 sensor to digital pin 5
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
String apiKey = "BE75******FXX79N"; // replace with your channel's thingspeak WRITE API key
String ssid="s7*******"; // Wifi network SSID
String password ="va******1"; // Wifi network password
boolean DEBUG=true;
//======================================================================== showResponce
void showResponse(int waitTime){
long t=millis();
char c;
while (t+waitTime>millis()){
if (espSerial.available()){
c=espSerial.read();
if (DEBUG) Serial.print(c);
}
}
}
//========================================================================
boolean thingSpeakWrite(float value1, float value2){
String cmd = "AT+CIPSTART="TCP",""; // TCP connection
cmd += "184.106.153.149"; // api.thingspeak.com
cmd += "",80";
espSerial.println(cmd);
if (DEBUG) Serial.println(cmd);
if(espSerial.find("Error")){
if (DEBUG) Serial.println("AT+CIPSTART error");
return false;
}
String getStr = "GET /update?api_key="; // prepare GET string
getStr += apiKey;
getStr +="&field1=";
getStr += String(value1);
getStr +="&field2=";
getStr += String(value2);
// getStr +="&field3=";
// getStr += String(value3);
// ...
getStr += "\r\n\r\n";
// send data length
cmd = "AT+CIPSEND=";
cmd += String(getStr.length());
espSerial.println(cmd);
if (DEBUG) Serial.println(cmd);
delay(100);
if(espSerial.find(">")){
espSerial.print(getStr);
if (DEBUG) Serial.print(getStr);
}
else{
espSerial.println("AT+CIPCLOSE");
// alert user
if (DEBUG) Serial.println("AT+CIPCLOSE");
return false;
}
return true;
}
//================================================================================ setup
void setup() {
DEBUG=true; // enable debug serial
Serial.begin(9600);
dht.begin(); // Start DHT sensor
espSerial.begin(9600); // enable software serial
// Your esp8266 module's speed is probably at 115200.
// For this reason the first time set the speed to 115200 or to your esp8266 configured speed
// and upload. Then change to 9600 and upload again
espSerial.println("AT+RST"); // Enable this line to reset the module;
showResponse(1000);
//espSerial.println("AT+UART_CUR=9600,8,1,0,0"); // Enable this line to set esp8266 serial speed to 9600 bps
//showResponse(1000);
espSerial.println("AT+CWMODE=1"); // set esp8266 as client
showResponse(1000);
espSerial.println("AT+CWJAP=""+ssid+"",""+password+"""); // set your home router SSID and password
showResponse(5000);
if (DEBUG) Serial.println("Setup completed");
}
// ====================================================================== loop
void loop() {
// Read sensor values
float t = dht.readTemperature();
float h = dht.readHumidity();
if (isnan(t) || isnan(h)) {
if (DEBUG) Serial.println("Failed to read from DHT");
}
else {
if (DEBUG) Serial.println("Temp="+String(t)+" *C");
if (DEBUG) Serial.println("Humidity="+String(h)+" %");
thingSpeakWrite(t,h); // Write values to thingspeak
}
// thingspeak needs 15 sec delay between updates,
delay(20000);
}
