Hello everybody. Im trying to run the code of a weather station in Arduino but I keep getting the dht does not name a type error. And it gives me the error on a line where I've written this: dht DHT;
I have included the libraries and even installed them on the side but I keep getting that. If needed I can even post the full log of the error. If anyone can help me resolve it I would be very grateful.
Here is the code:
#include <stdlib.h>
#include <SoftwareSerial.h>
#include <DHT.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP085_U.h>
#define SSID "DroidSpot" //replace XXXXX by your router SSID
#define PASS "password!" //replace YYYYY by your router password
#define IP "184.106.153.149" // thingspeak.com IP
#define DHT22_PIN 2
String GET = "GET /update?key=link="; //replace ZZZZZ by your ThingSpeak channel write key
SoftwareSerial monitor(10, 11); //Serial communication to ESP8266 module (RX, TX)
dht DHT;
Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10085);
//Variables
int luminancePin = A0;
int uvPin = A1;
int dustPin = 8;
unsigned long duration;
unsigned long starttime;
unsigned long sampletime_ms = 30000;
unsigned long delay_time = 60000;
unsigned long lowpulseoccupancy = 0;
float ratio = 0;
float concentration = 0;
//setup
void setup()
{
//start serial communications
Serial.begin(9600);
monitor.begin(9600);
Serial.println("Initializing...");
//configure Arduino pins
pinMode(dustPin, INPUT);
//initialize pressure sensor
Serial.println("Detecting BMP085 pressure sensor...");
if(!bmp.begin())
{
Serial.println("BMP085 sensor wasn't detected. Verify your connections or I2C ADDR!");
while(1);
}
Serial.println("BMP085 detected!");
//communication with wifi module
monitor.flush();
monitor.println("AT");
delay(2000);
if(monitor.find("OK")){
Serial.println("Communication with ESP8266 module: OK");
}
else {
Serial.println("ESP8266 module ERROR");
}
//connect wifi router
connectWiFi();
Serial.print("Sampling (");
Serial.print(sampletime_ms/1000);
Serial.println("s)...");
//initialize timer
starttime = millis();
}
void loop(){
//measuring dust particles
duration = pulseIn(dustPin, LOW);
lowpulseoccupancy = lowpulseoccupancy + duration;
//30 seconds cicle
if ((millis() - starttime) >= sampletime_ms)
{
ratio = lowpulseoccupancy/(sampletime_ms10.0); // percentage (de 0 a 100%)
concentration = 1.1pow(ratio,3)-3.8pow(ratio,2)+520ratio+0.62; // from datsheet
lowpulseoccupancy = 0;
//read other sensors
char buffer[10];
//light sensor
float luminance = analogRead(luminancePin);
//UV sensor
float uv = analogRead(uvPin);
uv = uv * 0.0049; //convert values to volts
uv = uv * 307; //convert to mW/m²
uv = uv/200; //calculate UV index
//temperature and humidity
int chk = DHT.read22(DHT22_PIN);
float humidity = DHT.humidity;
float temperature = DHT.temperature;
//pressure and temperature1
sensors_event_t event;
bmp.getEvent(&event);
float pressure = 0;
float temperature1 = 0;
if (event.pressure)
{
pressure = event.pressure;
bmp.getTemperature(&temperature1);
}
//convert sensor values to strings
String luminanceStr = dtostrf(luminance, 4, 1, buffer);
luminanceStr.replace(" ","");
String uvStr = dtostrf(uv, 4, 1, buffer);
uvStr.replace(" ","");
String humidityStr = dtostrf(humidity, 4, 1, buffer);
humidityStr.replace(" ","");
String temperatureStr = dtostrf(temperature, 4, 1, buffer);
temperatureStr.replace(" ","");
String dustStr = dtostrf(concentration, 4, 1, buffer);
dustStr.replace(" ","");
String pressureStr = dtostrf(pressure, 4, 1, buffer);
pressureStr.replace(" ","");
String temperature1Str = dtostrf(temperature1, 4, 1, buffer);
temperature1Str.replace(" ","");
//send data to ThingSpeak
updateSensors(luminanceStr, humidityStr, temperatureStr, uvStr, dustStr, pressureStr, temperature1Str);
//wait next sampling cycle
Serial.print("Wait ");
Serial.print(delay_time/1000);
Serial.println("s for next sampling");
Serial.println();
delay(delay_time);
//initialize new cycle
Serial.println();
Serial.print("Sampling (");
Serial.print(sampletime_ms/1000);
Serial.println("s)...");
starttime = millis();
}
}
//Send data to ThingSpeak
void updateSensors(String luminanceStr, String humidityStr, String temperatureStr, String uvStr, String dustStr, String pressureStr, String temperature1Str) {
String cmd = "AT+CIPSTART="TCP","";
cmd += IP;
cmd += "",80";
monitor.println(cmd);
delay(2000);
cmd = GET;
cmd += luminanceStr;
cmd += "&field2=";
cmd += humidityStr;
cmd += "&field3=";
cmd += temperatureStr;
cmd += "&field4=";
cmd += uvStr;
cmd += "&field5=";
cmd += dustStr;
cmd += "&field6=";
cmd += pressureStr;
cmd += "&field7=";
cmd += temperature1Str;
cmd += "\r\n";
delay(1000);
int strsize = cmd.length();
monitor.println("AT+CIPSEND=" + String(strsize));
delay(2000);
monitor.print(cmd);
if(monitor.find("OK")){
Serial.println("Transmission completed with success");
}else{
Serial.println("Transmission failed!");
}
}
void sendDebug(String cmd){
Serial.print("SEND: ");
Serial.println(cmd);
monitor.println(cmd);
}
boolean connectWiFi(){
Serial.println("Connecting wi-fi...");
String cmd ="AT+CWMODE=1";
monitor.println(cmd);
delay(2000);
monitor.flush(); //clear buffer
cmd="AT+CWJAP="";
cmd+=SSID;
cmd+="","";
cmd+=PASS;
cmd+=""";
monitor.println(cmd);
delay(5000);
if(monitor.find("OK")){
Serial.println("Connection succeeded!");
return true;
}else{
Serial.println("Connection failed!");
return false;
}
Serial.println();
}
