🌍🐶 Smart IoT Pet Feeder using ESP32 + Servo + Blynk IoT (Cloud Dashboard)

📦 Components Required

• ESP32

• SG90 Servo Motor

• External 5V power supply

• WiFi connection

• Blynk IoT account

🔌 Circuit Connection

Servo → ESP32

⚠ IMPORTANT
Common ground between ESP32 and external supply.

🌐 Blynk IoT Setup (Very Important Section)

Go to:
👉 https://blynk.cloud
Login and follow steps below.

🔹 Step 1: Create Template

1. Click New Template

2. Template Name:

    

    

   Smart Pet Feeder

    

3. Hardware: ESP32

4. Connection Type: WiFi

5. Click Done

🔹 Step 2: Create Datastreams

Go to Datastreams → New Datastream

1️⃣ Virtual Pin V0 (Button Control)

• Datastream Type: Virtual Pin

• Pin: V0

• Data Type: Integer

• Min: 0

• Max: 1

• Default: 0

Purpose:
👉 1 = Open
👉 0 = Close

2️⃣ Virtual Pin V1 (Status Display)

• Datastream Type: Virtual Pin

• Pin: V1

• Data Type: Integer

• Min: 0

• Max: 1

Purpose:
👉 Show gate status

🔹 Step 3: Create Device

1. Go to Devices

2. Click New Device

3. From Template

4. Select Smart Pet Feeder

5. Copy Auth Token

You will paste this into code.

🔹 Step 4: Dashboard Setup

Open Blynk Mobile App.

Add Widgets:

🔘 Button Widget

• Datastream: V0

• Mode: Switch

💡 LED Widget

• Datastream: V1

• ON color: Green

• OFF color: Red

Now dashboard ready ✅

💻 FINAL ESP32 + Blynk Code

Install libraries first:

• Blynk

• ESP32Servo

Now paste code:

#define BLYNK_TEMPLATE_ID "YOUR_TEMPLATE_ID"
#define BLYNK_DEVICE_NAME "Smart Pet Feeder"
#define BLYNK_AUTH_TOKEN "YOUR_AUTH_TOKEN"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <ESP32Servo.h>

char ssid[] = "YOUR_WIFI_NAME";
char pass[] = "YOUR_WIFI_PASSWORD";

Servo feederServo;
const int servoPin = 18;
int gateState = 0; // 0 = Closed, 1 = Open

BLYNK_WRITE(V0)
{
int value = param.asInt();

if (value == 1) {
feederServo.write(90);
gateState = 1;
Blynk.virtualWrite(V1, 1);
}
else {
feederServo.write(0);
gateState = 0;
Blynk.virtualWrite(V1, 0);
}
}

void setup()
{
Serial.begin(115200);

feederServo.attach(servoPin);
feederServo.write(0); // Start Closed

Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
}

void loop()
{
Blynk.run();
}

🧠 Code Explanation (Professional Understanding)

1️⃣ Template & Auth Token

These connect ESP32 to:

• Your Blynk cloud

• Your specific dashboard

2️⃣ BLYNK_WRITE(V0)

This function runs automatically when:
User presses Button on dashboard.

If:

• Button ON → value = 1

• Button OFF → value = 0

3️⃣ Servo Control Logic

Opens gate.

Closes gate.

4️⃣ Status Update

Turns ON LED widget.

Turns OFF LED widget.

5️⃣ Blynk.run()

Maintains communication between:

• ESP32

• Blynk Cloud

• Mobile App

Without this → IoT won’t work.

📱 Working Flow

1. ESP32 connects to WiFi

2. Connects to Blynk Cloud

3. User presses button

4. Cloud sends command

5. Servo rotates

6. Status LED updates

7. Real-time control from anywhere

🎯 What Students Learn From Final Version

• IoT cloud architecture

• Virtual Pins concept

• Real-time cloud control

• Dashboard design

• Professional IoT system

• Industry-level project structure

🚀 Advanced Upgrade Ideas (Next Level)

Shiv 👑 You can now upgrade to:

• 🕒 Scheduled feeding timer

• 📦 Food level sensor (ultrasonic)

• 📊 Feeding history graph

• 📱 Notification when feeding done

• 📷 Camera monitoring

• 🧠 AI-based feeding schedule

📌 Final Conclusion

This Smart IoT Pet Feeder project demonstrates:

• Embedded Systems

• Cloud IoT integration

• Remote automation

• Real-world application