#Temperature and Humidity Data Collection Using Arduino and Scratch

Project Title: Temperature and Humidity Data Collection Using Arduino and Scratch

      1. Introduction: 

● This project involves collecting temperature and humidity data using an Arduino and a DHT11/DHT22 sensor. 

● The data will be displayed in Scratch and exported to an Excel file.

2. Components Required: 

● Arduino Uno (or compatible board) 

● DHT11/DHT22 temperature and humidity sensor 

● Jumper wires

● USB cable for Arduino 

● Computer with Scratch and Arduino extension installed

3. Circuit Diagram & Connection: 

● Connect the VCC pin of the DHT sensor to 5V on Arduino. 

● Connect the GND pin to GND on Arduino. 

● Connect the Data pin to Digital Pin 2 on Arduino.

4. Software Setup: 

● Install Scratch and the Arduino extension. 

● Install the DHT sensor library in Arduino IDE. 

● Upload the Arduino sketch to communicate with Scratch

5. Arduino Code: 

● Open Arduino IDE and upload the following code: 

#include <DHT.h> 

#define DHTPIN 2

#define DHTTYPE DHT11 // Change to DHT22 if using that sensor 

DHT dht(DHTPIN, DHTTYPE); 

void setup() { 

Serial.begin(9600); 

dht.begin(); 

} 

void loop() { 

float temp = dht.readTemperature(); 

float hum = dht.readHumidity(); 

Serial.print("Temperature: "); 

Serial.print(temp); 

Serial.print(" C "); 

Serial.print("Humidity: "); 

Serial.print(hum); 

Serial.println(" %"); 

delay(2000); 

} 

6. Scratch Configuration: 

● Open Scratch and add the Arduino extension. 

● Use Serial Read blocks to receive data from Arduino. 

● Display temperature and humidity values in Scratch using variables.

7. Exporting Data to Excel: 

● Use Scratch CSV Logger extension or manually copy data from Scratch to a CSV file.

● Open the CSV file in Excel for analysis. 

8. Testing & Results: 

● Ensure that Scratch is displaying live temperature and humidity values.

● Verify the exported data in Excel. 

9. Conclusion: 

● Successfully collected and logged temperature & humidity data using Arduino and Scratch. 

● Data can be further analyzed for environmental monitoring applications.10. References & Additional Learning: 

● Arduino Official Website 

● Scratch Programming Guide 

● DHT Sensor Datasheet 

11. Additional Reference Videos: 

● https://www.youtube.com/watch?v=b968xQr8Kwg(DHT11 Temperature Sensor Interfacing With Arduino). 

● https://www.youtube.com/watch?v=zOa5o9Yq_ZU(Scratch Basics).

● https://www.youtube.com/watch?v=pCCJVt2251Y&list=PLk-9mEhYb2OVpfWfjU0F sV4vGKMvV84KN(Programming Arduino With Scratch).