Circuit Documentation

Summary

This circuit integrates various components to perform a set of functions that likely involve motor control, timekeeping, and weight measurement. An Arduino UNO serves as the central microcontroller, interfacing with an L293D motor driver to control a DC motor, an RTC (Real-Time Clock) module for timekeeping, and an HX711 bridge sensor interface connected to a load cell for weight measurement.

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.

L293D Motor Driver

• A motor driver IC that allows DC motor to drive on either direction
• It has 4 input pins, 4 output pins, 2 enable pin, VCC and GND.

DC Motor

• An electric motor that runs on direct current (DC) electricity.
• It has 2 pins for power connection.

RTC Module

• A real-time clock module that keeps track of the current time.
• It typically includes a crystal oscillator and a battery to maintain timekeeping when the main power is off.

Load Cell - Red/white/black/green

• A transducer that is used to create an electrical signal whose magnitude is directly proportional to the force being measured.
• It has 4 pins for electrical connection.

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.

Wiring Details

Arduino UNO

• 5V connected to VCC of HX711, L293D Motor Driver, and RTC Module
• GND connected to GND of HX711, L293D Motor Driver, and RTC Module
• A4 (SDA) connected to SDA of RTC Module
• A5 (SCL) connected to SCL of RTC Module
• D9 connected to EN_A of L293D Motor Driver
• D7 connected to SCK - CLOCK (IN) of HX711
• D6 connected to DATA (OUT) of HX711
• D5 connected to A2 of L293D Motor Driver
• D4 connected to A1 of L293D Motor Driver

L293D Motor Driver

• VCC connected to 5V of Arduino UNO
• GND connected to GND of Arduino UNO
• EN_A connected to D9 of Arduino UNO
• A1 connected to D4 of Arduino UNO
• A2 connected to D5 of Arduino UNO
• MPIN_3 connected to pin 2 of DC Motor
• MPIN_4 connected to pin 1 of DC Motor

DC Motor

• pin 1 connected to MPIN_4 of L293D Motor Driver
• pin 2 connected to MPIN_3 of L293D Motor Driver

RTC Module

• VCC connected to 5V of Arduino UNO
• GND connected to GND of Arduino UNO
• SDA connected to A4 of Arduino UNO
• SCL connected to A5 of Arduino UNO

Load Cell - Red/white/black/green

• E+ connected to E+ of HX711
• A- connected to A- of HX711
• E- connected to E- of HX711
• A+ connected to A+ of HX711

HX711 - Bridge Sensor Interface

• 3.3/3.5V Supply connected to 5V of Arduino UNO
• GND - GROUND connected to GND of Arduino UNO
• SCK - CLOCK (IN) connected to D7 of Arduino UNO
• DATA (OUT) connected to D6 of Arduino UNO
• E+ connected to E+ of Load Cell
• A- connected to A- of Load Cell
• E- connected to E- of Load Cell
• A+ connected to A+ of Load Cell

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 include specific functionality. It needs to be filled in with the logic to control the motor driver, read data from the RTC module, and interface with the HX711 to read the load cell.