Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes various components such as a ULN2003A breakout board, a Module UPS Voltage, a Step down Buck converter, a DS1307 RTC, an Arduino UNO, an ESP-8266 Controller, an LCD 20x4 I2C display, and a 12V power supply. The circuit is designed to manage power distribution and control various peripherals using the Arduino UNO and ESP-8266 microcontrollers.

Component List

ULN2003A Breakout Board

• Description: A Darlington transistor array used for driving high-current loads.
• Pins: In 1, In 2, In 3, In 4, In 5, In 6, In 7, 0V, +5V, ON/OFF jumper switch, BLUE wire, PINK wire, YELLOW wire, ORANGE wire, RED wire

Module UPS Voltage

• Description: A UPS module for providing uninterrupted power supply.
• Pins: Input DC + 5V-12V, INPUT DC - 0V, Output + Load Positive, Battery 0V Negative, Battery + 3.7V~4.2V Positive

Step Down Buck Converter

• Description: A DC-DC converter that steps down voltage.
• Pins: IN +, IN - GND, OUT +, OUT - GND

DS1307 RTC (Wokwi Compatible)

• Description: A real-time clock module.
• Pins: GND, 5V, SDA, SCL, SQW

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• 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

ESP-8266 Controller

• Description: A Wi-Fi microcontroller module.
• Pins: A0, RSV, SD3, SD5, SD1, CMD, D0, D1, D2, D3, D4, 3V3, GND, D5, D6, SD0, CLK, RST, EN, D7, D8, RX, TX, Vin, 5V

LCD 20x4 I2C

• Description: A 20x4 character LCD display with I2C interface.
• Pins: GND, 5v, SCA, SCL

18650 Li-ion Battery x 2

• Description: Two 18650 Li-ion batteries for power supply.
• Pins: +, -

12V Power Supply

• Description: A 12V DC power supply.
• Pins: +, -

Wiring Details

ULN2003A Breakout Board

• 0V: Connected to Module UPS Voltage and Step Down Buck Converter (IN - GND)
• +5V: Connected to Module UPS Voltage (Output + Load Positive) and Step Down Buck Converter (IN +)

Module UPS Voltage

• Input DC + 5V-12V: Connected to 12V Power Supply (+)
• INPUT DC - 0V: Connected to 12V Power Supply (-)
• Output + Load Positive: Connected to ULN2003A Breakout Board (+5V) and Step Down Buck Converter (IN +)
• Battery 0V Negative: Connected to 18650 Li-ion Battery x 2 (-)
• Battery + 3.7V~4.2V Positive: Connected to 18650 Li-ion Battery x 2 (+)

Step Down Buck Converter

• IN +: Connected to Module UPS Voltage (Output + Load Positive) and ULN2003A Breakout Board (+5V)
• IN - GND: Connected to Module UPS Voltage and ULN2003A Breakout Board (0V)
• OUT +: Connected to DS1307 RTC (5V), LCD 20x4 I2C (5v), ESP-8266 Controller (Vin), and Arduino UNO (Vin)
• OUT - GND: Connected to DS1307 RTC (GND), LCD 20x4 I2C (GND), ESP-8266 Controller (GND), and Arduino UNO (GND)

DS1307 RTC (Wokwi Compatible)

• 5V: Connected to Step Down Buck Converter (OUT +)
• GND: Connected to Step Down Buck Converter (OUT - GND)

Arduino UNO

• Vin: Connected to Step Down Buck Converter (OUT +)
• GND: Connected to Step Down Buck Converter (OUT - GND)

ESP-8266 Controller

• Vin: Connected to Step Down Buck Converter (OUT +)
• GND: Connected to Step Down Buck Converter (OUT - GND)

LCD 20x4 I2C

• 5v: Connected to Step Down Buck Converter (OUT +)
• GND: Connected to Step Down Buck Converter (OUT - GND)

18650 Li-ion Battery x 2

• +: Connected to Module UPS Voltage (Battery + 3.7V~4.2V Positive)
• -: Connected to Module UPS Voltage (Battery 0V Negative)

12V Power Supply

• +: Connected to Module UPS Voltage (Input DC + 5V-12V)
• -: Connected to Module UPS Voltage (INPUT DC - 0V)

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 Documentation (documentation.txt)