A robust and efficient library for decoding EV1527 RF remote control signals using AVR microcontrollers. This library accurately decodes the transmitted 24-bit frame from common wireless remote transmitters.
The EV1527 encoder is widely used in low-cost wireless remote control systems such as car alarms, door openers, and lighting control. It transmits a 24-bit serial code through ASK (Amplitude Shift Keying) modulation, typically at 433 MHz.
Each frame includes:
- 20-bit address field → Unique transmitter identification
- 4-bit data field → Key or command code
This library is designed to receive and decode that 24-bit frame precisely using:
- External interrupt (INT0) for signal edge detection
- Timer1 for accurate pulse width measurement
- Wireless door lock systems
- Smart home remote control receivers
- RF relay modules (433 MHz)
- Automotive keyless entry
The library implements a state machine inside the INT0 interrupt service routine (ISR).
It distinguishes between logic '0', logic '1', and sync pulses based on pulse width timing.
After a valid frame is captured, the address and data (key) are stored for user access.
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✅ Accurate 24-bit Frame Decoding
- Extracts full address (20 bits) and data (4 bits)
- Supports EV1527 and compatible encoders (e.g., PT2262)
✅ Timer-Based Pulse Measurement
- Utilizes Timer1 for microsecond-level precision
- Automatically handles timing thresholds for each bit type
✅ Interrupt-Driven Operation
- Uses
INT0for edge detection - Fully asynchronous and non-blocking
✅ Error Detection & Recovery
- Ignores invalid frames or timing errors
- Auto-resets on sync pulse or timeout
✅ Lightweight Implementation
- Low memory footprint
- Minimal CPU load — suitable for low-power systems
✅ Easy Integration
- Written in pure C for portability
- Works with any AVR microcontroller with Timer1 + INT0
- Compatible with PlatformIO and Atmel Studio projects
Here you'll find a collection of useful links and videos related to the topic of AVR microcontrollers.
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The resources are detailed in the sections below.
To access any of them, simply click on the corresponding blue link.
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This section provides a detailed description of all functions defined in the
ev1527.handev1527.cfiles. These APIs are responsible for decoding the EV1527 RF remote control protocol using an AVR microcontroller. The library handles signal capture via external interrupts and precise pulse timing through Timer1 to extract the 24-bit EV1527 frame (20-bit address + 4-bit data). It offers easy-to-use initialization and deinitialization functions, along with status flags and decoded data access through a structured data type. -
This repository contains comprehensive resources for AVR microcontrollers, including hardware schematics, software libraries, and educational projects.
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To access the repository files and save them on your computer, there are two methods available:
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Using Git Bash and Cloning the Repository
- This method is more suitable for advanced users and those familiar with command-line tools.
- By using this method, you can easily receive updates for the repository.
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Downloading the Repository as a ZIP file
- This method is simpler and suitable for users who are not comfortable with command-line tools.
- Note that with this method, you will not automatically receive updates for the repository and will need to manually download any new updates.
First, open Git Bash :
- Open the folder in File Explorer where you want the library to be stored.
- Right-click inside the folder and select the option "Open Git Bash here" to open Git Bash in that directory.
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If you do not see the "Open Git Bash here" option, it means that Git is not installed on your system.
You can download and install Git from this link.
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- Once Git Bash is open, run the following command to clone the repository:
git clone https://github.com/aKaReZa75/AVR_ev1527.git- You can copy the above command by either:
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Please keep in mind that the numbers displayed in the image might vary when you perform the same actions.
This is because repositories are continuously being updated and expanded. Nevertheless, the overall process remains unchanged.
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Advantage of Cloning the Repository:
- Receiving Updates: By cloning the repository, you can easily and automatically receive new updates.
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If you prefer not to use Git Bash or the command line, you can download the repository directly from GitHub as a ZIP file.
Follow these steps:
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Navigate to the GitHub repository page and Locate the Code button:
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Download the repository:
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Access the repository:
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- No Updates: Keep in mind that downloading the repository as a ZIP file does not allow you to receive updates.
If the repository is updated, you will need to download it again manually. - Ease of Use: This method is simpler and suitable for users who are not comfortable with Git or command-line tools.
If you have any questions or issues, you can raise them through the "Issues" section of this repository. Here's how you can do it:
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In the Title field, write a short summary of your issue or question.
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In the "Description" field, detail your question or issue as thoroughly as possible. You can use text formatting, attach files, and assign the issue to someone if needed. You can also use text formatting (like bullet points or code snippets) for better readability.
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Click on the "Submit new issue" button to post your question or issue.
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