Arduino+ESP826601+DHT

International Português
1

Boa tarde pessoal por favor me ajudem, eu estou tentando conectar o arduino com o esp e o dht e mandar os valores da temperatura para o thingspeak, porém estou com certos problemas, ao que parece esta tudo certo o arduino consegue se concetar a intrenet e tudo, pórem na hora de ler o DHT surge o porbelma, aparece no monitor serial "FAILED TO READ FROM DHT", por favor me ajudem é para uma projeto da faculdade.

segue o código

#include <Adafruit_Sensor.h>

#include <DHT.h>
#include <DHT_U.h>

#define DHTPIN 2 // Connect the signal pin of DHT11 sensor to digital pin 2
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

String apiKey = "QGSOQ74MD8W0MHMN"; // replace with your channel's thingspeak WRITE API key

String ssid="VIVOFIBRA-FF00"; // Wifi network SSID
String password ="33d73cff00"; // Wifi network password

boolean DEBUG=true;

//======================================================================== showResponce
void showResponse(int waitTime){
long t=millis();
char c;
while (t+waitTime>millis()){
if (Serial1.available()){
c=Serial1.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";
Serial1.println(cmd);
if (DEBUG) Serial.println(cmd);
if(Serial1.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());
Serial1.println(cmd);
if (DEBUG) Serial.println(cmd);

delay(100);
if(Serial1.find(">")){
Serial1.print(getStr);
if (DEBUG) Serial.print(getStr);
}
else{
Serial1.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

Serial1.begin(115200); // Your esp8266 module's speed is probably at 115200.

//Serial1.println("AT+UART_CUR=9600,8,1,0,0"); // Enable this line only if you want to change the ESP8266 baud rate to 9600

showResponse(1000);

//Serial1.println("AT+RST"); // reset esp8266
//showResponse(1000);

Serial1.println("AT+CWMODE=1"); // set esp8266 as client
showResponse(1000);

Serial1.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(16000);
}