Circuit Documentation

Summary

This circuit integrates various components controlled by an Arduino UNO microcontroller. It includes a load cell interfaced through an HX711 bridge sensor interface for weight measurement, a set of LEDs for status indication, a buzzer for audio feedback, an LCD for data display, and multiple rocker switches for user input. The circuit is powered by a pair of 18650 Li-ion batteries. The Arduino UNO manages the interaction between these components, processes sensor data, and controls the output devices based on the programmed logic.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button.

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.

Buzzer

• An electromechanical component that produces a continuous or intermittent sound when an electrical signal is applied.

LEDs (Red, Green, Yellow)

• Light Emitting Diodes used as visual indicators in the circuit.

Load Cell - Red/white/black/green

• A transducer that converts force into an electrical signal and is used in this circuit for weight measurement.

16X2 LCD

• A liquid crystal display capable of displaying 16 characters per line across 2 lines, used for data output.

Rocker Switch (SPST)

• A single pole single throw switch used to control the power or mode of operation in the circuit.

Potentiometer

• A three-terminal resistor with a rotating contact that forms an adjustable voltage divider.

18650 Li-ion Battery x 2

• A pair of rechargeable batteries providing the power source for the circuit.

Wiring Details

Arduino UNO

• GND connected to common ground net.
• 5V connected to Potentiometer VCC, 16X2 LCD A, and HX711 3.3/3.5V Supply.
• Vin connected to 18650 Li-ion Battery +.
• D13 connected to Buzzer POSITIVE.
• D12 connected to 16X2 LCD RS.
• D11 connected to 16X2 LCD E and LED (Yellow) anode.
• D10 connected to LED (Green) anode.
• D9 connected to LED (Red) anode.
• D8 connected to Rocker Switch (SPST) pin 1.
• D7 connected to Rocker Switch (SPST) pin 1.
• D6 connected to Rocker Switch (SPST) pin 1.
• D4 connected to 16X2 LCD D4 and D5.
• D3 connected to HX711 DATA (OUT).
• D2 connected to HX711 SCK - CLOCK (IN).

HX711 - Bridge Sensor Interface

• E+, A-, E-, A+ connected to corresponding Load Cell pins.
• GND - GROUND connected to common ground net.
• DATA (OUT) connected to Arduino UNO D3.
• SCK - CLOCK (IN) connected to Arduino UNO D2.
• 3.3/3.5V Supply connected to Arduino UNO 5V.

Buzzer

• POSITIVE connected to Arduino UNO D13.
• NEGATIVE connected to common ground net.

LEDs (Red, Green, Yellow)

• cathode connected to common ground net.
• anode of Red connected to Arduino UNO D9.
• anode of Green connected to Arduino UNO D10.
• anode of Yellow connected to Arduino UNO D11.

Load Cell - Red/white/black/green

• E+, A-, E-, A+ connected to corresponding HX711 pins.

16X2 LCD

• VSS connected to common ground net.
• VDD connected to Arduino UNO 5V.
• V0 connected to Potentiometer Output.
• RS connected to Arduino UNO D12.
• RW connected to common ground net.
• E connected to Arduino UNO D11.
• D0 - D7 connected to common ground net.
• A connected to Arduino UNO 5V.
• K connected to common ground net.

Rocker Switch (SPST)

• Pin 1 of each switch connected to Arduino UNO D6, D7, D8 respectively.
• Pin 2 of each switch connected to common ground net.

Potentiometer

• GND connected to common ground net.
• Output connected to 16X2 LCD V0.
• VCC connected to Arduino UNO 5V.

18650 Li-ion Battery x 2

• + connected to Arduino UNO Vin.
• - connected to common ground net.

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:

}

Note: The provided code is a template and does not contain any functional logic. It needs to be populated with the specific setup and loop code to control the circuit components as per the requirements.