Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an Arduino UNO microcontroller, a 12V power supply, a 0.96" OLED display, a 5V relay, a fan, an NPN transistor, resistors, and LEDs. The circuit is designed to control a fan and display information on the OLED screen, with additional indicators using LEDs.

Component List

12V Power Supply

• Description: Provides 12V power to the circuit.
• Pins: +, -

0.96" OLED

• Description: OLED display for visual output.
• Pins: GND, VDD, SCK, SDA

5V Relay

• Description: Relay to control high-power devices.
• Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC

Arduino UNO

• Description: Microcontroller for controlling the circuit.
• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

Fan

• Description: 5V fan for cooling.
• Pins: GND, 5V

NPN Transistor (EBC)

• Description: Transistor for switching.
• Pins: emitter, base, collector

Resistor (10k Ohms)

• Description: Resistor with 10k Ohms resistance.
• Pins: pin1, pin2

Resistor (220 Ohms)

• Description: Resistor with 220 Ohms resistance.
• Pins: pin1, pin2

LED: Two Pin (Red)

• Description: Red LED for indication.
• Pins: cathode, anode

LED: Two Pin (Green)

• Description: Green LED for indication.
• Pins: cathode, anode

Wiring Details

12V Power Supply

• + connected to Vin of Arduino UNO and Common terminal of 5V relay.
• - connected to GND of Arduino UNO and GND of Fan.

0.96" OLED

• GND connected to GND of Arduino UNO.
• VDD connected to 5V of Arduino UNO.
• SCK connected to A5 of Arduino UNO.
• SDA connected to A4 of Arduino UNO.

5V Relay

• GND connected to collector of NPN Transistor and GND of Arduino UNO.
• VCC connected to emitter of NPN Transistor and 5V of Arduino UNO.
• Common terminal connected to + of 12V power supply.
• Normally Open connected to 5V of Fan.
• In connected to D7 of Arduino UNO.

Arduino UNO

• Vin connected to + of 12V power supply.
• GND connected to - of 12V power supply and GND of Fan.
• 5V connected to VCC of 5V relay and VDD of 0.96" OLED.
• D2 connected to pin1 of 10k Ohms Resistor.
• D4 connected to anode of Green LED.
• D5 connected to anode of Red LED.
• D7 connected to In of 5V relay.
• A4 connected to SDA of 0.96" OLED.
• A5 connected to SCK of 0.96" OLED.

Fan

• GND connected to GND of Arduino UNO.
• 5V connected to Normally Open of 5V relay.

NPN Transistor (EBC)

• emitter connected to VCC of 5V relay and 5V of Arduino UNO.
• base connected to pin1 of 10k Ohms Resistor.
• collector connected to GND of 5V relay and GND of Arduino UNO.

Resistor (10k Ohms)

• pin1 connected to base of NPN Transistor and D2 of Arduino UNO.
• pin2 connected to emitter of NPN Transistor.

Resistor (220 Ohms)

• pin1 connected to GND of Arduino UNO.
• pin2 connected to cathode of Red LED.

Resistor (220 Ohms)

• pin1 connected to GND of Arduino UNO.
• pin2 connected to cathode of Green LED.

LED: Two Pin (Red)

• cathode connected to pin2 of 220 Ohms Resistor.
• anode connected to D5 of Arduino UNO.

LED: Two Pin (Green)

• cathode connected to pin2 of 220 Ohms Resistor.
• anode connected to D4 of Arduino UNO.

Code Documentation

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:

}

documentation.txt

This document provides a comprehensive overview of the circuit, including a summary, component list, wiring details, and documented code.