ESP32 Smart Mailbox Notifier
An IoT-based smart mailbox system that sends instant notifications when new mail is delivered using ESP32.
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₹1728.00
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Components
8 items
Difficulty
Intermediate
Build Time
1.5 – 2 hours
Project Details
How It Works
How It WorksThe reed switch is placed on the mailbox door. When the door opens, the magnetic field changes and the switch changes state. ESP32 detects this change via GPIO pin 27 (configured with internal pull-up resistor). When a LOW signal is detected, ESP32 triggers a notification via Wi-Fi. The ESP32 connects to your Wi-Fi network and sends alerts through services like IFTTT, Blynk, or Telegram Bot. For power efficiency, the ESP32 can use deep sleep mode and wake up only when the GPIO interrupt occurs, allowing the battery to last for months.
Prerequisites
Basic knowledge of ESP32 programming, understanding of GPIO pins and digital inputs, familiarity with Wi-Fi connectivity, and experience with Arduino IDE. Users should also know how to set up notification services like IFTTT or Telegram.
What You'll Learn
What You'll LearnLearn to use GPIO pins for event detection and interrupts
Understand how to connect ESP32 to Wi-Fi and send data
Design systems that respond to real-world events
Implement deep sleep and power management for battery operation
Key Features
Real-time detection when mailbox door opens
Battery-efficient operation with deep sleep mode
Notifications via mobile app, email, Telegram, or cloud dashboard
Simple setup with minimal components
Can be upgraded with camera, solar power, or multiple mailboxes
What's Included in the Kit
| Component | Qty | Price |
|---|---|---|
 | 1 | ₹0.00 |
Reed Switch / Limit Switch | 1 | ₹0.00 |
 | 1 | ₹124.00 |
 | 1 | ₹0.00 |
 | 1 | ₹0.00 |
 | 1 | ₹2.00 |
 | 1 | ₹171.00 |
 | 1 | ₹16.00 |
Operating Instructions
Pin Connections
Pin Connections| MCU Pin | Connected To | Purpose | Notes |
|---|---|---|---|
| GPIO 27 | Reed Switch | Digital input for door detection | Enable internal pull-up resistor |
| GND | Reed Switch | Ground connection for reed switch circuit | - |
| GPIO 2 | LED (optional) | Digital output for visual indicator | Requires series resistor |
Tools Required
Tools RequiredSafety Precautions
Electrical
- ⚠Use low-voltage battery only (3.7V-5V)
- ⚠Avoid short circuits in enclosed space
- ⚠Ensure proper insulation of wires
Handling
- ⚠Handle ESP32 with care to avoid static damage
- ⚠Secure all components to prevent movement during transport
Operating
- ⚠Use waterproof enclosure for outdoor installation
- ⚠Avoid metal shielding near antenna for better Wi-Fi signal
Frequently Asked Questions
Frequently Asked QuestionsQ:Can this work without Wi-Fi?
Q:Can false alerts be avoided?
Q:Can I reset alerts remotely?
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