Smart Letterbox Notifier Kit with Arduino Uno + LED
Build a Smart Letterbox Notifier with Arduino Uno & LCD — Never Miss a Mail Again
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Imagine knowing exactly when your mail arrives without stepping outside. With this Smart Letterbox Notifier Kit, you'll build an Arduino-powered system that detects letters using an infrared break-beam sensor, logs the event to EEPROM, and shows the pending mail count on a 16x2 LCD display—all from a handy circuit you assemble yourself. It's a satisfying blend of hardware tinkering and practical home automation that solves a real everyday problem.
What You'll Build
You'll construct a functional mail alert device that fits inside any standard letterbox. When a letter drops through, it interrupts the IR beam, triggering the Arduino to increment a counter and store it in non-volatile memory. The LCD shows "Mail Pending: X" so you always know if you have mail waiting—perfect for lazy Sunday mornings or when you're expecting an important delivery.
What You'll Learn
- How to interface an IR break-beam sensor with an Arduino Uno
- Writing code to read digital sensor states and debounce signals
- Storing and retrieving data from Arduino's internal EEPROM for persistent count
- Wiring an I2C LCD backpack to display real-time information
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| IR LED | 2 |
| IR Photodiode | 2 |
| 16x2 LCD | 1 |
| I2C Backpack | 1 |
| LM393 Comparator | 1 |
| 10kΩ Resistors | 10 |
| 220Ω Resistors | 5 |
| 100nF Capacitors | 5 |
| 400-pt Breadboard | 1 |
| Male-to-Male Jumper Wires | 25 |
| 9V Battery Snap | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
This kit is ideal for CBSE Class 11–12 students exploring embedded systems, B.Tech ECE/EEE undergraduates working on mini-projects, and ATL Tinkering Lab participants. It's also great for hobbyists who want a practical home automation solution to track mail delivery without any guesswork.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
You can immediately scan the QR code for the AI companion that guides you step by step, or reach us on WhatsApp for real-time help within hours.
Can I modify the system to send an SMS alert?
Yes, you can extend the project with a GSM module (SIM800L) and the Arduino will send a text when mail arrives. The EEPROM count remains the same.
Does the letterbox need to be a specific size?
The sensor setup is compact and can be mounted in almost any vertical-drop letterbox. The breadboard and Arduino can sit outside or inside, depending on space.
How long does the battery last?
With a standard 9V alkaline battery, the notifier can run for several days of continuous monitoring. For permanent use, consider a rechargeable battery or power adapter.
IR break beam inside letterbox detects mail drop and stores event to EEPROM with count. LCD shows mail pending count.
What's in this kit
- Arduino Uno R3
- IR LED x2
- IR Photodiode x2
- 16x2 LCD
- I2C Backpack
- LM393 Comparator
- 10kΩ Resistors x10
- 220Ω Resistors x5
- 100nF Caps x5
- 400-pt Breadboard
- M-M Wires x25
- 9V Battery Snap
Other projects you can build
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items