Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes a load cell, an HX711 bridge sensor interface, a touch sensor, a buzzer, an LCD display, and an Arduino Mega 2560 microcontroller. The circuit is powered by a 9V battery and includes various connectors and terminal blocks for wiring.

Component List

Load Cell - Red/white/black/green

• Description: A load cell used for measuring weight.
• Pins: E+, A-, E-, A+

Terminal Block (8-pin)

• Description: A terminal block for connecting multiple wires.
• Pins: 1, 2, 3, 4, 5, 6, 7, 8

Wire Connector

• Description: A connector for joining wires.
• Pins: +, -

HX711 - Bridge Sensor Interface

• Description: An interface for connecting bridge sensors like load cells.
• Pins: E+, E-, A-, A+, B-, B+, GND, DATA (OUT), SCK (IN), 3.3/3.5V Supply

Touch Sensor TTP233

• Description: A touch sensor for detecting touch inputs.
• Pins: GND, I/O, VCC

2.1mm Barrel Jack with Terminal Block

• Description: A barrel jack for power input.
• Pins: POS, NEG

Buzzer

• Description: A buzzer for sound output.
• Pins: POSITIVE, NEGATIVE

16x2 I2C LCD

• Description: An LCD display with I2C interface.
• Pins: GND, VCC, SDA, SCL

Arduino Mega 2560

• Description: A microcontroller board based on the ATmega2560.
• Pins: IOREF, RESET, 3V3, 5V, GND, VIN, A0-A15, D0-D53, PWM, AREF, SDA, SCL

LED: Two Pin (red)

• Description: A red LED.
• Pins: cathode, anode

LED: Two Pin (green)

• Description: A green LED.
• Pins: cathode, anode

9V Battery

• Description: A 9V battery for power supply.
• Pins: -, +

Wiring Details

Load Cell - Red/white/black/green

• E+ connected to Terminal Block (8-pin) Pin 2
• A- connected to Terminal Block (8-pin) Pin 4
• E- connected to Terminal Block (8-pin) Pin 6
• A+ connected to Terminal Block (8-pin) Pin 8

Terminal Block (8-pin)

• Pin 1 connected to HX711 E+
• Pin 2 connected to Load Cell E+
• Pin 3 connected to HX711 E-
• Pin 4 connected to Load Cell A-
• Pin 5 connected to HX711 A-
• Pin 6 connected to Load Cell E-
• Pin 7 connected to HX711 A+
• Pin 8 connected to Load Cell A+

Wire Connector

• + connected to 2.1mm Barrel Jack POS
• - connected to 2.1mm Barrel Jack NEG
• + connected to 9V Battery +
• - connected to 9V Battery -

HX711 - Bridge Sensor Interface

• E+ connected to Terminal Block Pin 1
• E- connected to Terminal Block Pin 3
• A- connected to Terminal Block Pin 5
• A+ connected to Terminal Block Pin 7

Touch Sensor TTP233

• No connections specified in the net list.

2.1mm Barrel Jack with Terminal Block

• POS connected to Wire Connector +
• NEG connected to Wire Connector -

Buzzer

• POSITIVE connected to Arduino Mega 2560 D13 PWM
• NEGATIVE connected to Arduino Mega 2560 GND

16x2 I2C LCD

• SDA connected to Arduino Mega 2560 D20/SDA
• SCL connected to Arduino Mega 2560 D21/SCL

Arduino Mega 2560

• D13 PWM connected to Buzzer POSITIVE
• GND connected to Buzzer NEGATIVE
• D20/SDA connected to 16x2 I2C LCD SDA
• D21/SCL connected to 16x2 I2C LCD SCL

LED: Two Pin (red)

• No connections specified in the net list.

LED: Two Pin (green)

• No connections specified in the net list.

9V Battery

• + connected to Wire Connector +
• - connected to Wire Connector -

Documented Code

Arduino Mega 2560 Code

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

}

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

}

This concludes the documentation for the circuit. Each component and its connections have been detailed, along with the code for the Arduino Mega 2560 microcontroller.