Circuit Documentation

Summary

The circuit in question is designed to interface a DHT22 temperature and humidity sensor with a Raspberry Pi 3B microcontroller. The DHT22 sensor is a digital sensor that provides temperature and humidity readings, which can be read by the Raspberry Pi through one of its GPIO pins. The sensor requires a power supply, a ground connection, and a data signal connection to operate. The Raspberry Pi 3B serves as the central processing unit for the circuit, capable of executing code to interact with the DHT22 sensor and process its data.

Component List

Raspberry Pi 3B

• Description: A microcontroller board based on the Broadcom BCM2837 SoC, which includes a 1.2GHz 64-bit quad-core ARM Cortex-A53 CPU. It has 40 GPIO pins, including power and ground pins.
• Purpose: Acts as the central processing unit for the circuit, reads data from the DHT22 sensor, and can be programmed to perform various tasks based on the sensor data.

DHT22

• Description: A digital temperature and humidity sensor with a calibrated digital signal output.
• Purpose: Measures the ambient temperature and humidity and provides this information to the Raspberry Pi via a digital signal.

Wiring Details

Raspberry Pi 3B

• 3v3: Provides power to the DHT22 sensor.
• GPIO21: Receives the digital signal from the DHT22 sensor.
• GND: Common ground connection with the DHT22 sensor.

DHT22

• VCC: Connected to the 3v3 power supply from the Raspberry Pi 3B.
• SIGNAL: Sends the digital signal representing temperature and humidity data to GPIO21 on the Raspberry Pi 3B.
• GND: Connected to the ground pin on the Raspberry Pi 3B.

Documented Code

No code has been provided for the microcontroller. To fully utilize the circuit, code should be written and deployed to the Raspberry Pi 3B to initialize the GPIO pins, read data from the DHT22 sensor, and process the data accordingly. The code should handle the specific communication protocol used by the DHT22 sensor to ensure accurate data retrieval.

Please note that the documentation provided is based on the inputs given and does not include any additional considerations such as pull-up resistors, capacitive filtering, or error handling which may be necessary for a robust design.