Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to interface an Arduino Nano with various components including an LCD screen, a relay, a keypad, a buzzer, and power management modules. The circuit is powered by a 5V DC source and includes a charging and power-boosting solution for a Li-ion battery setup. The Arduino Nano serves as the central microcontroller, facilitating user input through a keypad and providing output to an LCD screen and a buzzer. Additionally, the circuit can control an AC-powered LED bulb via a relay.

Component List

LCD Screen 16x2 I2C

• Description: A 16x2 character LCD display with an I2C interface.
• Pins: SCL, SDA, VCC, GND

5V Relay

• Description: A relay module capable of switching AC/DC loads.
• Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC

4X4 Membrane Matrix Keypad

• Description: A 4x4 matrix keypad for user input.
• Pins: R1, R2, R3, R4, C1, C2, C3, C4

18650 Li-ion Battery x 2

• Description: A pair of 18650 Li-ion batteries for power storage.
• Pins: +, -

DC Source 5V

• Description: A 5V DC power supply.
• Pins: VCC, GND

LED Bulb AC / Bombillo AC

• Description: An AC-powered LED bulb.
• Pins: +, -

AC Source

• Description: An alternating current power source.
• Pins: -, +

Buzzer

• Description: An audible signaling device.
• Pins: PIN, GND

Arduino Nano

• Description: A compact microcontroller board based on the ATmega328.
• Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

PowerBoost 1000 Basic Pad Terminal

• Description: A power regulator and booster for Li-ion batteries.
• Pins: VBAT, GND, ENABLE, LBO, 5.0V

TP4056

• Description: A lithium battery charger and protection module.
• Pins: OUT-, B-, B+, OUT+, IN-, IN+

Wiring Details

LCD Screen 16x2 I2C

• SCL connected to Arduino Nano A5
• SDA connected to Arduino Nano A4
• VCC connected to PowerBoost 1000 Basic Pad Terminal 5.0V
• GND connected to PowerBoost 1000 Basic Pad Terminal GND

5V Relay

• Normally Open connected to LED Bulb AC -
• Common terminal connected to AC Source +
• Normally Closed not used in this circuit
• In connected to Arduino Nano D4
• GND connected to PowerBoost 1000 Basic Pad Terminal GND
• VCC connected to PowerBoost 1000 Basic Pad Terminal 5.0V

4X4 Membrane Matrix Keypad

• R1 connected to Arduino Nano D5
• R2 connected to Arduino Nano D6
• R3 connected to Arduino Nano D7
• R4 connected to Arduino Nano D8
• C1 connected to Arduino Nano D9
• C2 connected to Arduino Nano D10
• C3 connected to Arduino Nano D11/MOSI
• C4 connected to Arduino Nano D12/MISO

18650 Li-ion Battery x 2

• • connected to PowerBoost 1000 Basic Pad Terminal VBAT and TP4056 B+
• • connected to PowerBoost 1000 Basic Pad Terminal GND and TP4056 B-

DC Source 5V

• VCC connected to TP4056 IN+
• GND connected to TP4056 IN-

LED Bulb AC / Bombillo AC

• • connected to 5V Relay Normally Open
• • connected to AC Source -

Buzzer

• PIN connected to Arduino Nano D13/SCK
• GND connected to PowerBoost 1000 Basic Pad Terminal GND

Documented Code

Arduino Nano 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 provided code is a template and does not include specific functionality. It needs to be populated with the logic to handle keypad inputs, drive the LCD display, control the relay, and activate the buzzer.
• The Arduino Nano's pins are used for I2C communication with the LCD, digital control of the relay, and interfacing with the keypad. The buzzer is also connected to a digital pin for audible output.
• The PowerBoost 1000 Basic Pad Terminal and TP4056 are used for managing the power from the Li-ion batteries, ensuring a stable 5V supply to the circuit components.
• The relay module is used to switch the AC-powered LED bulb on and off, demonstrating the capability of the circuit to control high-power devices.