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
Do you deliver across India?
Yes. We ship Smart Letterbox Notifier Kit with Arduino Uno + LED across India including Delhi, Mumbai, Bangalore, Hyderabad, Chennai, and Pune. Orders ship in 1-5 days.
What payment options are available for Smart Letterbox Notifier Kit with Arduino Uno + LED?
We accept UPI, all major debit and credit cards, and Cash on Delivery (COD), available across India.
Built and shipped from Compoden, with COD and UPI available across India.
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