Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to interface various components including power modules, a microcontroller, communication modules, sensors, and output devices. The circuit is powered by a Li-ion 18650 battery, regulated and charged by a TP4056 module, and further boosted by a PowerBoost 1000 Basic Pad USB. The Arduino Mega 2560 serves as the central microcontroller, interfacing with a SIM800L GSM module, two fingerprint scanners, an I2C LCD display, an IR sensor, and a piezo buzzer. An AC-DC power module is included to provide an alternative power source.

Component List

• PowerBoost 1000 Basic Pad USB: A power supply module that boosts the battery voltage to 5V and provides a USB output.
• Li-ion 18650 Battery: A rechargeable battery providing power to the circuit.
• Mini AC-DC 110V-230V to 5V 700mA Module: A power supply module that converts AC power to 5V DC.
• Fingerprint Scanner: Two identical modules used to scan fingerprints for identification purposes.
• Electrolytic Capacitor: A capacitor used for filtering and stabilizing the power supply.
• TP4056: A lithium battery charging module that also provides battery protection.
• Power 220v: Represents the main AC power connection to the circuit.
• Arduino Mega 2560: The main microcontroller board that controls the circuit.
• LCD 20x4 I2C: An alphanumeric LCD display with an I2C interface for displaying information.
• SIM800L: A GSM/GPRS module for cellular communication.
• Piezo Buzzer: An output device that emits sound when powered.
• IR Sensor: An infrared sensor used for proximity or motion detection.

Wiring Details

PowerBoost 1000 Basic Pad USB

• VBAT: Connected to the positive terminal of the Li-ion 18650 Battery.
• GND: Common ground with the Li-ion 18650 Battery, TP4056, SIM800L, and Arduino Mega 2560.
• ENABLE: Not connected in the provided net list.
• LBO: Not connected in the provided net list.
• 5.0V: Provides power to the Arduino Mega 2560 VIN pin, and both Fingerprint Scanners' VCC pins.

Li-ion 18650 Battery

• +: Connected to the positive terminal of the PowerBoost 1000 Basic Pad USB and TP4056 B+ pin.
• -: Connected to the negative terminal of the PowerBoost 1000 Basic Pad USB, TP4056 B- pin, and the common ground net.

Mini AC-DC 110V-230V to 5V 700mA Module

• GND: Connected to the TP4056 IN- pin.
• 5v: Connected to the TP4056 IN+ pin.
• Neutral: Connected to the neutral wire of the Power 220v.
• Life: Connected to the hot wire of the Power 220v.

Fingerprint Scanner (Two Instances)

• VCC: Both connected to the 5.0V output of the PowerBoost 1000 Basic Pad USB.
• TX: One connected to the Arduino Mega 2560 D19/RX1 pin, the other to D17 PWM/RX2.
• RX: One connected to the Arduino Mega 2560 D18/TX1 pin, the other to D16 PWM/TX2.
• GND: Common ground with the Arduino Mega 2560 and other components.

Electrolytic Capacitor

• -: Connected to the common ground net.
• +: Connected to the positive terminal of the Li-ion 18650 Battery and TP4056 B+ pin.

TP4056

• OUT-: Not connected in the provided net list.
• B-: Connected to the negative terminal of the Li-ion 18650 Battery and the common ground net.
• B+: Connected to the positive terminal of the Li-ion 18650 Battery.
• OUT+: Not connected in the provided net list.
• IN-: Connected to the GND of the Mini AC-DC 110V-230V to 5V 700mA Module.
• IN+: Connected to the 5v of the Mini AC-DC 110V-230V to 5V 700mA Module.

Power 220v

• Neutral Wire: Connected to the Neutral of the Mini AC-DC 110V-230V to 5V 700mA Module.
• Hot Wire: Connected to the Life of the Mini AC-DC 110V-230V to 5V 700mA Module.

Arduino Mega 2560

• Various I/O Pins: Connected to the TX/RX pins of the Fingerprint Scanners, SIM800L, IR Sensor, and Piezo Buzzer.
• 5V: Provides power to the IR Sensor.
• GND: Common ground with all components requiring a ground connection.
• VIN: Receives power from the 5.0V output of the PowerBoost 1000 Basic Pad USB.
• I2C Pins (D20/SDA, D21/SCL): Connected to the I2C interface of the LCD 20x4 I2C.

LCD 20x4 I2C

• GND: Common ground with the Arduino Mega 2560 and other components.
• 5v: Receives power from the 5.0V output of the PowerBoost 1000 Basic Pad USB.
• SCA: Connected to the D20/SDA pin of the Arduino Mega 2560.
• SCL: Connected to the D21/SCL pin of the Arduino Mega 2560.

SIM800L

• NET: Not connected in the provided net list.
• RST: Not connected in the provided net list.
• VCC: Connected to the positive terminal of the Li-ion 18650 Battery and TP4056 B+ pin.
• RXD: Connected to the D14/TX3 pin of the Arduino Mega 2560.
• TXD: Connected to the D15/RX3 pin of the Arduino Mega 2560.
• GND: Common ground with the Li-ion 18650 Battery, TP4056, and Arduino Mega 2560.

Piezo Buzzer

• Pin 1: Connected to the D12 PWM pin of the Arduino Mega 2560.
• Pin 2: Common ground with the Arduino Mega 2560 and other components.

IR Sensor

• Out: Connected to the D10 PWM pin of the Arduino Mega 2560.
• Gnd: Common ground with the Arduino Mega 2560 and other components.
• Vcc: Receives power from the 5V pin of the Arduino Mega 2560.

Documented Code

Arduino Mega 2560 (Instance ID: 3c06891e-ee86-4eb6-add4-d0ca85c0f596)

File: sketch.ino

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

}

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

}

File: documentation.txt

(No additional documentation provided for the code)

(Note: The code provided is a template with no functional implementation. Additional code is required to control and interact with the connected components.)