https://github.com/phancak/keypad-board

A compact, low-power keypad module based on the STM32L010K4T6 MCU. Featuring a 12-button interface, this board communicates with a host MCU via I2C or UART and serves as a mini keyboard for embedded systems. Ideal for IoT and embedded applications where user input is required with minimal power consumption.
https://github.com/phancak/keypad-board

button-control expandable i2c-interface low-power-comsumption stm32l010

Last synced: about 1 month ago
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A compact, low-power keypad module based on the STM32L010K4T6 MCU. Featuring a 12-button interface, this board communicates with a host MCU via I2C or UART and serves as a mini keyboard for embedded systems. Ideal for IoT and embedded applications where user input is required with minimal power consumption.

• Host: GitHub
• URL: https://github.com/phancak/keypad-board
• Owner: phancak
• License: mit
• Created: 2025-03-10T20:50:25.000Z (12 months ago)
• Default Branch: main
• Last Pushed: 2025-07-29T23:19:07.000Z (7 months ago)
• Last Synced: 2025-07-30T01:41:04.313Z (7 months ago)
• Topics: button-control, expandable, i2c-interface, low-power-comsumption, stm32l010
• Homepage:
• Size: 1.84 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# STM32L010K4T6 Keypad Board  

## Overview  

This project features a **low-power, compact keypad module** based on the **STM32L010K4T6 MCU**, designed to function as a **mini keyboard** for embedded systems. The board includes **twelve tactile buttons**, with the STM32 MCU handling **debouncing and key scanning**, then transmitting keypress data to a host MCU via **I2C or UART**.  

This design optimizes processing efficiency on the host system by **offloading keypad management to the STM32L010K4T6**, making it ideal for applications requiring reliable **user input with minimal power consumption**.  

## Features  

✅ **STM32L010K4T6 MCU** – Ultra-low-power ARM Cortex-M0+ processor  

✅ **12-Button Keypad** – Efficient, responsive user input  

✅ **I2C & UART Communication** – Flexible interfacing with host MCUs  

✅ **Debouncing & Key Scanning** – Handled in firmware for accurate input detection  

✅ **Low Power Mode** – Automatic sleep mode when idle to conserve energy  

## Applications  

- **Embedded Systems** – User interface for microcontroller-based projects  

- **IoT Devices** – Low-power control panel for smart devices  

- **Industrial Automation** – Secure keypad entry for control units  

## Getting Started  

### Hardware Requirements  

- STM32L010K4T6 Keypad Board  

- Host MCU (STM32, ESP32, Raspberry Pi, etc.)  

- Power Supply (3.3V)  

- USB-to-Serial Debugging Tools  

### Software Requirements  

- **STM32CubeIDE** – Firmware development  

- **I2C/UART Libraries** – Communication with the host MCU  

- **ST-Link or J-Link** – Debugging and flashing tools  

## Setup & Usage  

1. **Power the Board** – Provide 3.3V supply to the MCU.  

2. **Connect to Host MCU** – Use I2C or UART for communication.  

3. **Flash Firmware** – Load key scanning and communication code.  

4. **Receive Key Data** – Host MCU processes key events for input handling.  

## Repository Structure  

/Firmware - STM32 firmware source code

/Core - Main application files

/Drivers - HAL and LL peripheral drivers

/Keypad - Debouncing and key scanning logic

/Utils - Utility functions and helper libraries

/Hardware - PCB schematics and design files

/Schematic - Circuit diagrams (PDF, KiCad, Altium, etc.)

/PCB - Board layout files (Gerber, BOM, assembly files)

/Docs - Technical documentation and references

/Getting_Started - Setup guides, connection diagrams

/Datasheets - Component datasheets

/Application_Notes - Project use cases and performance analysis

/Examples - Sample projects demonstrating board usage

/I2C_Host - Example of interfacing via I2C

/UART_Host - Example of interfacing via UART

/Tools - Development tools and scripts

/Flashing_Scripts - Python scripts for automated flashing

/Debug_Scripts - Debugging utilities for logging

## Future Enhancements  

- 🔹 **Configurable Key Mapping** – Customize key assignments via firmware  

- 🔹 **Multi-Press Support** – Enable simultaneous key detection  

- 🔹 **Low-Power Optimization** – Further reduce power consumption for battery-based applications  

## License  

This project is open-source under the **MIT License**.  

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