# DHT11 Temperature & Humidity Sensor - Microcontroller

I had a tough time getting the ESP8266 Microcontroller to read from a DHT11 sensor properly, mainly due to small errors in my code and process.

### Learnings Along the Way:

- setting the I/O pin number to '8' was not working and giving a nan reading. Changing to 'D8' however worked. 
- I am not able to upload a script while the input pin (D8) is connected to the board. Arduino IDE throws an error that it either can't find the port or it's in use. 
   - First I had to disconnect the D8 pin from the board, leaving the ground and power pins in. 
  - Then I'm able to upload the script to the microcontroller
 - After uploading, I reconnect the input pin to the microcontroller. I'm able to do this while the board has usb power
- passing true in ```dht.readTemperature(true);``` changes the output to Fahrenheit from Celsius 




### Working code: 

```C
#include "DHT.h"
#define DHTTYPE DHT11 //change to DHT22 if needed
 
DHT dht(D8,DHTTYPE); 
void setup(void)
{

  dht.begin();
  Serial.begin(115200);
  Serial.println("setup");
  delay(1000);//Wait before accessing Sensor
 
}//end "setup()"

void loop() {

  float h =dht.readHumidity();
  float t =dht.readTemperature(true);

  Serial.print("Current Humidity = ");
  Serial.print(h);
  Serial.print("% ");
  Serial.print("Temperature = ");
  Serial.print(t);
  Serial.println("DHT11 Humidity & temperature Sensor\n\n");
  delay(800);
}
```