Project Idea
Unlock and control a garage or gate remotely using any basic mobile phone by entering a numeric password during a call, leveraging DTMF (dual-tone multi-frequency) technology for secure, hands-free access.
Project Description
This project automates opening and closing of a garage door via mobile phone keypad. The user calls a dedicated phone attached to the system and enters a specific password; the DTMF decoder IC converts keypad tones to digital signals, which are verified by the 8051 microcontroller. When correct, the microcontroller activates a motor driver to open or close the door—a solution that eliminates manual operation and increases convenience.
Total List of Components
8051 microcontroller (AT89S52)
DTMF decoder module ( MT8870)
Motor driver IC (L293D)
DC mini sliding gate motor
Crystal oscillator (11.0592 MHz)
Resistors
Capacitors
Transistors (BC547)
Connectors and header pins
Diode (1N4007)
PCB or breadboard for prototyping
LEDs (for indication)
Transformer/Adapter (12V, 1-2A)
Push buttons (for reset/provisioning)
SPDT switches
IC sockets (40-pin)
Jumper cables
Chassis and gate fixture for demo
Project Features
Remote password input for secure door operation
Compatible with all standard mobile phones via audio jack/call
Reliable DTMF multi-frequency decoding
Microcontroller-based validation for enhanced security
Option to update password using non-volatile EEPROM (with code modification)
On-board status indication via LED
Simple motor control for gate movement (open/close)
Low power consumption
Applications
Garage and main gate automation
Industrial shutters and shop doors
Office access control
Secure home entry and smart garage systems
Project Includes:
Fully assembled and tested circuit
Circuit diagram
Source code
(For DIY KITs - only the components will be provided)
Project Types:
- DIY KIT(Do IT YourSelf KIT) - We are providing only components in this kit for this project
- DIY KIT with Code & Circuit Connections - Along with the components, you will get the Code and the Circuit Connections file to help you build the project easily.
- Readymade Breadboard - We are providing fully assembled, tested and ready-made project using plug-n-play jumper wires and breadboard with all the other components, code & circuit diagram.
- Readymade Soldered - We are providing fully assembled, tested and ready-made project soldered on a PCB with all the other components, code & circuit diagram.
Dimensions
Main PCB unit: 12cm x 10cm x 4cm (L x W x H), excluding the demo gate hardware
Shipping Dimensions
Box size: 28cm x 24cm x 8cm (L x W x H)
Weight
Project (without enclosure): ≈500g
With demo sliding gate & full hardware (including adapter): ≈1kg
Estimate Project Weight
Safe estimate (packaging included): 2kg
Notes: All the products are made by LearnElectronics India and not for re-sale.
DTMF Cell Phone Based Door Opener
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Order Processing Time:
- All project orders are processed within 2-3 business days after payment confirmation.
- After processing, the development of your project will begin. We require a minimum of 10-15 days to complete and prepare your project for shipment. However, please note that the delivery time is an estimate and may vary depending on project complexity and component availability.
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Delivery Timeframe:
- While we strive to deliver your project within the specified timeframe, there is no guaranteed delivery date. The actual delivery time may be shorter or longer depending on various factors, including shipping delays, customs clearance, and unforeseen technical challenges.
- We will keep you informed of your project's progress and provide updates on the estimated delivery time as needed.
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Shipping and Delivery Charges:
- Delivery charges are additional and are not included in the project price. The shipping cost will be calculated at checkout based on your location and the chosen shipping method.
- Customers are responsible for any customs duties, taxes, or fees that may be applicable in their country.
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Order Cancellations:
- Due to the customized nature of our projects, orders can only be canceled within 24 hours of placement. After this period, the order is non-cancellable as work will have already begun.
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Returns and Refunds:
- As these are custom-built projects, we do not accept returns or offer refunds unless the project is defective or significantly not as described.
- If there are any issues with your project upon delivery, please contact us within 7 days to resolve the matter.
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Technical Support:
- We provide basic technical support for the first 30 days after delivery to help you set up and operate your project.
- Extended support and customization services are available at an additional cost.
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Disclaimer:
- We are not responsible for delays caused by external factors beyond our control, including but not limited to shipping carrier delays, natural disasters, or government restrictions.
- By placing an order, you agree to the terms and conditions outlined in this policy.
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