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Arduino UNO-Based Smart Weighing Scale with Bluetooth and LCD Display

Image of Arduino UNO-Based Smart Weighing Scale with Bluetooth and LCD Display

Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with various components including an HX711 weighing sensor module, a load cell, an HC-06 Bluetooth module, an LCD screen, multiple LEDs, a pushbutton, a speaker controller, and a speaker. The circuit is designed to measure weight, display information on an LCD, and provide feedback through LEDs and a speaker. Additionally, it includes Bluetooth communication capabilities.

Component List

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

HX711 Weighing Sensor Module

  • Description: A precision 24-bit analog-to-digital converter (ADC) designed for weigh scales and industrial control applications.
  • Pins: B-, B+, A-, A+, E-, E+, VCC, CK/TX, DO/RX, GND

Load Cell - Red/white/black/green

  • Description: A sensor that measures force or weight.
  • Pins: E+, A-, E-, A+

HC-06

  • Description: A Bluetooth module for wireless communication.
  • Pins: RXD, TXD, GND, VCC

LCD screen 16x2 I2C

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

LED: Two Pin (red)

  • Description: A red LED with two pins.
  • Pins: cathode, anode

LED: Two Pin (yellow)

  • Description: A yellow LED with two pins.
  • Pins: cathode, anode

LED: Two Pin (green)

  • Description: A green LED with two pins.
  • Pins: cathode, anode

Resistor (300 Ohms)

  • Description: A resistor with a resistance of 300 Ohms.
  • Pins: pin1, pin2

Pushbutton

  • Description: A simple pushbutton switch.
  • Pins: Pin 2, Pin 1, Pin 3, Pin 4

Speaker Controller

  • Description: A controller for driving a speaker.
  • Pins: VCC, GND, P-E, REC, SP1 +, SP1 -, MIC +, MIC -

Speaker

  • Description: A speaker for audio output.
  • Pins: +, -

Wiring Details

Arduino UNO

  • 5V connected to:

    • HX711 Weighing Sensor Module (VCC)
    • HC-06 (VCC)
    • Speaker Controller (VCC)
    • LCD screen 16x2 I2C (VCC)

  • GND connected to:

    • HX711 Weighing Sensor Module (GND)
    • HC-06 (GND)
    • Pushbutton (Pin 2)
    • Resistor (pin2)
    • Resistor (pin2)
    • Speaker Controller (GND)
    • Resistor (pin2)
    • LCD screen 16x2 I2C (GND)

  • A4 connected to:

    • LCD screen 16x2 I2C (SDA)

  • A5 connected to:

    • LCD screen 16x2 I2C (SCL)

  • D12 connected to:

    • LED: Two Pin (red) (anode)

  • D11 connected to:

    • LED: Two Pin (yellow) (anode)

  • D10 connected to:

    • LED: Two Pin (green) (anode)

  • D8 connected to:

    • Pushbutton (Pin 3)

  • D7 connected to:

    • Speaker Controller (P-E)

  • D6 connected to:

    • HC-06 (RXD)

  • D5 connected to:

    • HC-06 (TXD)

  • D3 connected to:

    • HX711 Weighing Sensor Module (DO/RX)

  • D2 connected to:

    • HX711 Weighing Sensor Module (CK/TX)

HX711 Weighing Sensor Module

  • VCC connected to:

    • Arduino UNO (5V)

  • GND connected to:

    • Arduino UNO (GND)

  • DO/RX connected to:

    • Arduino UNO (D3)

  • CK/TX connected to:

    • Arduino UNO (D2)

  • A- connected to:

    • Load Cell (A+)

  • A+ connected to:

    • Load Cell (A-)

  • E- connected to:

    • Load Cell (E+)

  • E+ connected to:

    • Load Cell (E-)

Load Cell

  • A+ connected to:

    • HX711 Weighing Sensor Module (A-)

  • A- connected to:

    • HX711 Weighing Sensor Module (A+)

  • E+ connected to:

    • HX711 Weighing Sensor Module (E-)

  • E- connected to:

    • HX711 Weighing Sensor Module (E+)

HC-06

  • VCC connected to:

    • Arduino UNO (5V)

  • GND connected to:

    • Arduino UNO (GND)

  • RXD connected to:

    • Arduino UNO (D6)

  • TXD connected to:

    • Arduino UNO (D5)

LCD screen 16x2 I2C

  • VCC connected to:

    • Arduino UNO (5V)

  • GND connected to:

    • Arduino UNO (GND)

  • SDA connected to:

    • Arduino UNO (A4)

  • SCL connected to:

    • Arduino UNO (A5)

LED: Two Pin (red)

  • anode connected to:
    • Arduino UNO (D12)

LED: Two Pin (yellow)

  • anode connected to:
    • Arduino UNO (D11)

LED: Two Pin (green)

  • anode connected to:
    • Arduino UNO (D10)

Pushbutton

  • Pin 2 connected to:

    • Arduino UNO (GND)

  • Pin 3 connected to:

    • Arduino UNO (D8)

Speaker Controller

  • VCC connected to:

    • Arduino UNO (5V)

  • GND connected to:

    • Arduino UNO (GND)

  • P-E connected to:

    • Arduino UNO (D7)

  • SP1 + connected to:

    • Speaker (+)

  • SP1 - connected to:

    • Speaker (-)

Speaker

  • + connected to:

    • Speaker Controller (SP1 +)

  • - connected to:

    • Speaker Controller (SP1 -)

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)

This documentation provides a comprehensive overview of the circuit, including a detailed list of components, their connections, and the code used in the microcontroller.