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Arduino Uno Smart Feeder with GSM Alerts and Ultrasonic Level Detection

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Circuit Documentation

Summary

This circuit is designed to control a servo motor, relay, and various sensors using an Arduino Uno R3. It includes an LCD display for user interaction, a real-time clock (RTC) for timekeeping, and a GSM module for sending SMS notifications. The circuit also features push buttons for setting the time and an ultrasonic sensor for distance measurement.

Component List

  1. Arduino Uno R3

    • Description: A microcontroller board based on the ATmega328P.
    • Pins: D8, D9, D10, D11, D12, D13, GND, AREF, SDA, SCL, D0/RX, D1/Tx, D2, D3, D4, D5, 6, D7, A5/SCL, A4/SDA, A3, A2, A1, A0, Vin, 5V, 3.3V, RESET, IOREF, NONE, USB Jack, Power Jack

  2. 1 Channel Relay 5V

    • Description: A relay module that allows control of high voltage devices.
    • Pins: VCC, GND, IN, NC, COM, NO

  3. SIM900A

    • Description: A GSM module for sending and receiving SMS.
    • Pins: GND, DB9-3 (RXD), DB9-2 (TXD), 5V, 3VR, 5VR, 3VT, 5VT, VCC, Ring, RESTART, RESET, STATUS

  4. Servo Motor

    • Description: A motor that can be controlled to move to a specific position.
    • Pins: PWM, GND, VCC

  5. 20x4 I2C LCD Panel

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

  6. DS1302 RTC

    • Description: A real-time clock module for timekeeping.
    • Pins: VCC, GND, CLK, DATA, RST

  7. Push Button Round

    • Description: A simple push button for user input.
    • Pins: leg0, leg1

  8. HC-SR04 Ultrasonic Sensor

    • Description: A sensor for measuring distance using ultrasonic waves.
    • Pins: VCC, TRIG, ECHO, GND

  9. DC Motor

    • Description: A motor that runs on direct current.
    • Pins: pin 1, pin 2

  10. 12V 200Ah Battery

    • Description: A high-capacity battery for powering the circuit.
    • Pins: GND, 12V

Wiring Details

Arduino Uno R3

1 Channel Relay 5V

SIM900A

Servo Motor

20x4 I2C LCD Panel

DS1302 RTC

Push Button Round

HC-SR04 Ultrasonic Sensor

DC Motor

12V 200Ah Battery

Documented Code

#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <RTClib.h>
#include <Servo.h>
#include <SoftwareSerial.h>

// Initialize LCD, RTC, Servo, and GSM
LiquidCrystal_I2C lcd(0x27, 16, 4);  // Adjust the I2C address if necessary
RTC_DS3231 rtc;
Servo servoMotor;
SoftwareSerial sim900(11, 10);  // GSM SIM900A RX to 11, TX to 10

// Pin definitions
const int relayPin = 13;
const int servoPin = 9;
const int hourButton = 3;                    // Button to increment hour
const int minuteButton = 4;                  // Button to increment minute
const int confirmButton = 5;                 // Button to confirm time
const int triggerPin = 6;                    // Ultrasonic trigger pin
const int echoPin = 7;                       // Ultrasonic echo pin
const float distanceThreshold = 45.0;       // Distance threshold in cm
const char phoneNumber[] = "+639686791256";  // Replace with target phone number
const char phoneNumbers[] = "+639550468037";  // Replace with the second target phone number

boolean timeSet = false;   // Flag to indicate if the time has been set
int hour = 1, minute = 0;  // Default time settings

// Timing variables
unsigned long previousMillis = 0;
const