DHT Sensor

🌟 Introduction

The DHT Sensor blocks in Blockly allow users to interface with DHT11 or similar temperature and humidity sensors. These blocks simplify the process of initializing, measuring, and reading data from the sensor.

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🧠 What is a DHT Sensor?

The DHT11 sensor is a basic, inexpensive digital sensor used to measure:

• Temperature in degrees Celsius or Fahrenheit.
• Humidity as a percentage.

It is widely used in projects that require environmental monitoring, such as weather stations, greenhouses, or smart home systems.

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DHT Sensor Blocks Overview

1. Initialization Block

• Purpose: Prepares the sensor for operation by configuring the pin it is connected to.
• Block: "Initialize DHT11 on pin X"
  • Replace X with the pin number where the DHT sensor is connected.
• Usage: Must be used before attempting to measure or read data from the sensor.

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2. Start Measurement Block

• Purpose: Triggers the sensor to begin collecting data.
• Block: "Start to measure from [sensor]"
• Usage: Necessary for activating the sensor's internal measurement process before reading values. The [sensor] field is typically linked to the initialized DHT sensor.

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3. Read Data Block

• Purpose: Reads the measured temperature or humidity from the sensor.
• Block: "Read [Temperature/Humidity] from sensor"
  • Choose between Temperature or Humidity in the dropdown.
• Output: Returns the current value measured by the sensor:
  • Temperature: Returns temperature in Celsius or Fahrenheit.
  • Humidity: Returns humidity as a percentage.

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Example Workflow

1. Initialize the Sensor:

   • Use the initialization block and specify the pin number.

2. Start Measurement:

   • Use the "Start to measure" block to activate the sensor.

3. Read Data:

   • Use the "Read Temperature from sensor" block to get the temperature.
   • Use the "Read Humidity from sensor" block to get the humidity.

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Applications

• Weather Stations: Measure and display current temperature and humidity.
• Smart Agriculture: Monitor greenhouse conditions to maintain optimal growth.
• Home Automation: Create smart systems to adjust heating or ventilation based on environmental data.

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Conclusion

The DHT Sensor blocks in Blockly provide an intuitive way to read temperature and humidity data from a DHT11 sensor. With easy-to-use blocks for initialization, measurement, and reading, these sensors are perfect for educational and hobbyist projects alike. Happy building!