Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an Arduino UNO as the central microcontroller, interfaced with various components such as a 2-channel relay, an SHT31 temperature and humidity sensor, a fan, a USB female connector, and a power supply. The circuit is designed to control the fan and gather environmental data while being powered through a 5V power supply. The Arduino UNO facilitates the control logic and sensor data processing.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button.

2-Channel Relay

• An electrically operated switch that allows you to control two circuits with a single signal.
• It has normally closed (NC), common (COM), and normally open (NO) terminals for each channel, as well as inputs for the control signal (IN1, IN2) and power (VCC, GND).

SHT31

• A digital temperature and humidity sensor that provides calibrated, linearized signals in digital, I2C format.
• It has four pins: VCC, GND, SDA, and SCL.

Fan

• An electric fan powered by 5V.
• It has two pins: GND and 5V.

Power Supply 5V 5A

• A power supply unit that provides 5V DC at up to 5A current.
• It has inputs for 220V AC (positive and negative poles) and outputs for GND and 12V-24V DC.

AC Wire

• A wire used to connect the power supply to the AC mains.
• It has three wires: Line, Earth, and Neutral.

USB Female

• A female USB connector that can be used to provide power or data connections.
• It has four pins: VCC, GND, -D, and +D.

Terminal Blocks (04-01)

• Connector blocks used for making multiple wire connections.
• Each block has eight numbered pins.

Comments

• Non-electrical components used for adding notes or labels within the circuit design.

Wiring Details

Arduino UNO

• 3.3V connected to terminal block
• 5V connected to terminal block
• GND connected to multiple terminal blocks
• SCL connected to terminal block for I2C communication
• SDA connected to terminal block for I2C communication
• D7 connected to terminal block for digital control
• D4 connected to terminal block for digital control
• D2 connected to terminal block for digital control

2-Channel Relay

• NC not connected
• COM connected to the fan
• NO connected to terminal block
• VCC connected to terminal block for power
• IN2 connected to terminal block for control signal
• IN1 connected to terminal block for control signal
• GND connected to terminal block for ground

SHT31

• VCC connected to terminal block for power
• GND connected to terminal block for ground
• SDA connected to terminal block for I2C communication
• SCL connected to terminal block for I2C communication

Fan

• 5V connected to the relay's COM terminal
• GND connected to terminal block for ground

Power Supply 5V 5A

• 220V Positive Pole (AC) connected to AC wire
• 220V Negative Pole (AC) connected to AC wire
• GND connected to multiple terminal blocks for ground
• GND (DC) connected to terminal blocks for ground
• 12V-24V Output (DC) connected to terminal blocks for power distribution

AC Wire

• Line connected to power supply
• Earth connected to terminal block for safety
• Neutral connected to power supply

USB Female

• VCC connected to terminal block for power
• GND connected to terminal block for ground
• -D not connected
• +D not connected

Terminal Blocks (04-01)

• Used for distributing power, ground, and signals throughout the circuit.

Documented Code

Arduino UNO Code (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Additional Notes

• The code provided for the Arduino UNO is a template with empty setup() and loop() functions. The actual logic for controlling the relay and reading data from the SHT31 sensor needs to be implemented within these functions.
• The documentation.txt file is empty and can be used to add further explanations or instructions related to the code.