Project idea
Enable secure, long‑range control of a railway level crossing gate via SMS commands from authorized numbers, removing the need for wired controls or constant on‑site presence. SMS keywords like OPEN/CLOSE drive a DC motor through a motor driver, while status is shown on an LCD and gate endpoints are confirmed by limit switches.
Description
A SIM800L GSM module receives SMS commands and forwards them over UART to an 8051 board, which validates the sender against a programmable whitelist and actuates the gate through an H‑bridge driver. A 16×2 LCD displays live gate state, and limit switches provide end‑stop safety; power is derived from a 12V adapter with a buck stage to supply the GSM module’s required voltage.
Components
8051 development board with AT89S52 and programmer.
SIM800L GSM module with antenna.
L293D motor driver module.
16×2 LCD display.
12V 100 RPM DC geared motor.
12V 2A DC power adapter.
LM2596 buck converter module.
4×4 matrix keypad.
Limit switches (KW11‑3Z type).
ABS enclosure 20×12×7.5 cm class.
Features
Remote SMS control from any network range reachable by GSM, using simple OPEN/CLOSE commands.
Programmable authorized numbers to prevent unauthorized operation.
Live gate status on 16×2 LCD for clear operator feedback.
Safety limit switches to stop the motor at end positions and protect mechanics.
Robust H‑bridge motor drive suitable for 12V gate actuators.
Applications
Railway level crossing control from centralized or remote stations.
Backup/override control where wired links are unreliable or unavailable.
Academic training in GSM, embedded C for 8051, motor control, and HMI.
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
The main assembly fits a 200×120×75 mm ABS enclosure, equivalent to 20×12×7.5 cm for typical project builds. LCD and connectors mount on the lid or panel, and the motor/limit switches attach to the gate mechanism as per model/mechanical layout.
Shipping size
Packed with padding and adapter, a practical carton is around 25×20×10 cm to accommodate the 20×12×7.5 cm enclosure and accessories securely. Allow space for shock protection and cable bends to avoid strain on connectors during transit.
Weight
A comparable ABS enclosure around this size class weighs roughly 0.4 kg, providing a baseline for the assembled unit mass. Including electronics and moderate hardware, typical finished unit mass is about 0.8–1.0 kg depending on motor and mounting.
Est. weight
Estimated shipping weight with adapter and carton is about 2 kg, reflecting enclosure, electronics, motor, and packed power supply mass. Heavier gear motors or larger enclosures increase the shipping weight accordingly.
Notes: All the products are made by LearnElectronics India and not for re-sale.
SMS Railway Gate Control
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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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