i can only be reading from one sensor is there is anything wrong with the code
#include <DHT.h>
#include <ESP8266WiFi.h>
// replace with your channel’s thingspeak API key and your SSID and password
String apiKey = "7278LJY09HZVM2ZS";
const char* ssid = "murattu kalai";
const char* password = "thalapathy";
const char* server = "api.thingspeak.com";
DHT dht1(D8, DHT11);
DHT dht2(D3, DHT11);
DHT dht3(D2, DHT11);
WiFiClient client;
void setup()
{
Serial.begin(115200);
delay(10);
dht1.begin();
dht2.begin();
dht3.begin();
WiFi.begin(ssid, password);
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
}
void loop()
{
float h1 = dht1.readHumidity();
float t1 = dht1.readTemperature();
float h2 = dht2.readHumidity();
float t2 = dht2.readTemperature();
float h3 = dht3.readHumidity();
float t3 = dht3.readTemperature();
if (isnan(h1) || isnan(t1))
if (isnan(h2) || isnan(t2))
if (isnan(h3) || isnan(t3))
{
Serial.println("Failed to read from DHT1 sensor!");
Serial.println("Failed to read from DHT2 sensor!");
Serial.println("Failed to read from DHT3 sensor!");
return;
}
if (client.connect(server, 80)) {
String postStr = apiKey;
postStr += "&field1=";
postStr += String(t1);
postStr += "&field2=";
postStr += String(h1);
postStr += "&field3=";
postStr += String(t2);
postStr += "&field4=";
postStr += String(h2);
postStr += "&field5=";
postStr += String(t3);
postStr += "&field6=";
postStr += String(h3);
postStr += "\r\n\r\n";
client.print("POST /update HTTP/1.1\n");
client.print("Host: api.thingspeak.com\n");
client.print("Connection: close\n");
client.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");
client.print("Content-Type: application/x-www-form-urlencoded\n");
client.print("Content-Length: ");
client.print(postStr.length());
client.print("\n\n");
client.print(postStr);
Serial.print("Temperature1: ");
Serial.print(t1);
Serial.print(" degrees Celsius Humidity1: ");
Serial.print(h1);
Serial.println("Sending data to Thingspeak");
Serial.print("Temperature2: ");
Serial.print(t2);
Serial.print(" degrees Celsius Humidity2: ");
Serial.print(h2);
Serial.println("Sending data to Thingspeak");
Serial.print("Temperature3: ");
Serial.print(t3);
Serial.print(" degrees Celsius Humidity3: ");
Serial.print(h3);
Serial.println("Sending data to Thingspeak");
}
client.stop();
Serial.println("Waiting 20 secs");
// thingspeak needs at least a 15 sec delay between updates
// 20 seconds to be safe
delay(20000);
}