Reading Temperature & Humidity Using Surilli Basic M0

About:

Hello IoT starters. Surilli.io is back with another project made for beginners. In this tutorial, we will learn how to read temperature and humidity of some specified surrounding. Both the temperature and humidity will be stored inside their variables and can be used for numerous practical applications. For now, we will just read and print the value in serial monitor.

STEP 1: Plug In Your Surilli to the PC

STEP 2: Set Up Arduino IDE for Surilli

Make sure you have selected the right port, board and processor for the Surilli as shown in the picture below and it is programmable (compile and upload “Blink” from File>Examples>Digital>Blink onto your Surilli to check if everything is working fine).

STEP 3: The Circuitry

Connect the pins of DHT11 and Surilli as follows. DHT11 -> SURILLI

• GND -> GND
• VCC -> 3.3V
• DATA -> PIN A0

STEP 4: Upload and Burn Code onto Surilli

• Download the library for DHT from the link given below:

https://github.com/surilli-io/DHT11-Library

• Unzip it and paste in into This PC > Documents > Arduino > libraries.
• Now you have completed setting up your hardware. Copy and paste the code given below into your Arduino IDE sketch and hit upload.
• After it is uploaded, Open serial monitor to visualize the temperature and humidity values.

Complete Code:

#include <dht.h>
#define dht_apin A0 // Analog Pin sensor is connected to A0
dht DHT;
void setup(){ 
 SerialUSB.begin(9600);
 delay(500);//Delay to let system boot
 SerialUSB.println("DHT11 Humidity & temperature Sensor\n\n");
 delay(1000);//Wait before accessing Sensor
}
void loop(){
   DHT.read11(dht_apin);    
   SerialUSB.print("Current humidity = ");
   SerialUSB.print(DHT.humidity);
   SerialUSB.print("%  ");
   SerialUSB.print("temperature = ");
   SerialUSB.print(DHT.temperature); 
   SerialUSB.println("C  ");
   delay(5000);//Wait 5 seconds before accessing sensor again.    
}

That’s all for now. If you have any queries, visit surilli.io or contact our support. Something big is coming up in the next couple of tutorials which will show you people the power of Surilli. Stay tuned! ;-)