Circuit Documentation

Summary

The circuit in question is designed to interface various sensors and actuators with an Arduino Mega 2560 microcontroller. The circuit includes input devices such as RFID-RC522 for RFID reading, multiple IR sensors for object detection, a capacitive proximity sensor, and a load cell interfaced through an HX711 bridge sensor. Output devices include an LCD display with I2C interface and two micro servos. An ESP8285 ESP-M3 module is included for potential wireless communication. Power distribution is managed for both 5V and 3.3V components, and a 9V battery is included for power supply.

Component List

• Arduino Mega 2560: A microcontroller board based on the ATmega2560, with a variety of digital and analog I/O pins.
• RFID-RC522: An RFID reader/writer module.
• Lcd 20x4 i2c: A 20x4 character LCD display with an I2C interface.
• Micro servo 9G (x2): Small servos capable of precise position control.
• Load Cell - Red/white/black/green: A weight sensor for measuring force or load.
• HX711 - Bridge Sensor Interface: A precision 24-bit analog-to-digital converter (ADC) designed for weigh scales and industrial control applications to interface directly with a bridge sensor.
• IR Sensor (x3): Infrared sensors used for object detection.
• LJC18A3-B-Z/BY Capacitive Proximity Sensor: A sensor used to detect the presence of nearby objects without physical contact.
• Arduino UNO: A microcontroller board based on the ATmega328P, with a variety of digital and analog I/O pins.
• 9V Battery: A standard 9V battery used to power the circuit.
• ESP8285 ESP-M3: A compact Wi-Fi module that can be used for wireless communication.

Wiring Details

Arduino Mega 2560

• GND: Connected to the ground pins of the HX711, both Micro servos, the LCD, the RFID-RC522, and the ESP8285 ESP-M3.
• 5V: Powers the HX711, both Micro servos, and the LCD.
• 3V3: Powers the RFID-RC522.
• D21/SCL: Connected to the SCL pin of the LCD.
• D20/SDA: Connected to the SCA pin of the LCD.
• D2 PWM: Controls the PWM signal for one Micro servo.
• D4 PWM: Controls the PWM signal for the other Micro servo.
• D5 PWM: Connected to the RST pin of the RFID-RC522.
• D6 PWM: Connected to the DATA (OUT) pin of the HX711.
• D7 PWM: Connected to the SCK - CLOCK (IN) pin of the HX711.
• D10 PWM: Connected to the RX pin of the ESP8285 ESP-M3.
• D11 PWM: Connected to the TX pin of the ESP8285 ESP-M3.
• D52: Connected to the SCK pin of the RFID-RC522.
• D50: Connected to the MISO pin of the RFID-RC522.
• D40: Connected to the SIG (BLK) pin of the capacitive proximity sensor.
• D36: Connected to the out pin of one IR sensor.
• D34: Connected to the out pin of another IR sensor.
• D32: Connected to the out pin of the third IR sensor.
• D53: Connected to the SDA pin of the RFID-RC522.
• D51: Connected to the MOSI pin of the RFID-RC522.

RFID-RC522

• VCC (3.3V): Powered by the 3V3 pin of the Arduino Mega 2560.

Lcd 20x4 i2c

• GND: Ground connection.
• 5v: Powered by the 5V pin of the Arduino Mega 2560.
• SCA: Connected to the D20/SDA pin of the Arduino Mega 2560.
• SCL: Connected to the D21/SCL pin of the Arduino Mega 2560.

Micro servo 9G

• GND: Ground connection.
• +5V: Powered by the 5V pin of the Arduino Mega 2560.
• PWM: Receives PWM control signals from the D2 PWM and D4 PWM pins of the Arduino Mega 2560.

Load Cell - Red/white/black/green

• E+, A-, E-, A+: Connected to the corresponding pins on the HX711.

HX711 - Bridge Sensor Interface

• GND - GROUND: Ground connection.
• 3.3/3.5V Supply: Powered by the 5V pin of the Arduino Mega 2560.
• DATA (OUT): Connected to the D6 PWM pin of the Arduino Mega 2560.
• SCK - CLOCK (IN): Connected to the D7 PWM pin of the Arduino Mega 2560.

IR Sensor

• out: Connected to the D36, D34, and D32 pins of the Arduino Mega 2560.
• gnd: Ground connection.
• vcc: Powered by the 5V pin of the Arduino Mega 2560.

LJC18A3-B-Z/BY Capacitive Proximity Sensor

• VO (BLU): Connected to the negative terminal of the 9V Battery.
• VI (BRN): Connected to the positive terminal of the 9V Battery.

ESP8285 ESP-M3

• RX: Connected to the D10 PWM pin of the Arduino Mega 2560.
• TX: Connected to the D11 PWM pin of the Arduino Mega 2560.
• GND: Ground connection.
• 5V: Powered by the 5V pin of the Arduino Mega 2560.

Documented Code

Arduino Mega 2560 Code (sketch.ino)

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

}

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

}

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:

}

Note: The provided code for both the Arduino Mega 2560 and the Arduino UNO is a template with empty setup and loop functions. Actual implementation code will be required to control the components as per the circuit design.