Summary of Intelligent Letter Box using Arduino and GSM
This article describes an intelligent mail box system that notifies users via SMS when a letter is delivered. Using an IR sensor to detect incoming mail, the Arduino triggers a GSM module to send alerts. The system includes a 16x2 LCD for status display, a real-time clock, and an LED indicator. It also features data retention during power outages using EEPROM to store up to six delivery records, which can be cleared manually with a reset button.
Parts used in the Intelligent Letter Box:
- IR pair sensor
- GSM module
- 16x2 LCD display
- Real time clock circuit
- LED indicator
- Arduino microcontroller
- Reset button
- EEPROM (internal to Arduino)
In the days of technology postman still comes to our house for delivering the letters, couriers and parcels. Because some things like courier, parcels can’t sends via email and by using any other electronic media. So for getting notification of our letter delivery in our mail box here we design an intelligent mail/letter box, which provides notification of delivery of letters in our mail box via message to our mobile phones.
In this system an IR pair is used for sensing incoming letter in mail box and a GSM module for sending message to our phone. And a 16×2 LCD display for displaying time and letter box status (empty or not), delivery time, date and a real time clock circuit also is used in this system. And a LED is also configured for indication for letter box empty or not. When post man or any other person insert any letter in mail box IR sensor sense the letter (obstacle) and then Arduino sends commands to GSM module for sending notification message to specified phone number. Now we can collect our letter at that time if possible.
At the time we collect letters we have to press a reset button which clears all the entries of letters.And in this system an additional feature is also added in whichdata will not lose after electricity failure. Because in this system Arduino’s EEPROM is used for save/store the delivery time and dates. This system is designed to save only 6 delivery reports of letters. But it may be extend. You can try it yourself. And enjoy this at your home or college.
For more detail: Intelligent Letter Box using Arduino and GSM
- How does the system detect a new letter?
An IR pair senses the letter as an obstacle when inserted into the mail box. - What component sends notifications to the mobile phone?
The GSM module receives commands from the Arduino to send messages to specified numbers. - Does the system lose data if electricity fails?
No, the Arduino's EEPROM saves delivery times and dates so data is not lost after power failure. - How many delivery reports can the system save?
The system is designed to save only 6 delivery reports of letters. - How do I clear the stored letter entries?
You must press a reset button when collecting letters to clear all entries. - What information is displayed on the LCD screen?
The display shows time, date, delivery time, and the mail box status indicating if it is empty or not. - Can the storage capacity be extended beyond 6 reports?
Yes, the system may be extended to save more than 6 delivery reports. - What is the purpose of the LED in this project?
The LED is configured to indicate whether the mail box is empty or contains letters.
