This repository contains my lab work for Microcontrollers: Interface & Programming, covering both STM32-based embedded programming and Bluetooth Low Energy work on the nRF52840 DK.
Student: Sardar Ziyatkhanov Student ID: P000017499
Throughout the course, the labs moved from basic GPIO control and low-power STM32 operation to UART communication and BLE advertising/connection testing. The main platforms used were the STM32 Nucleo-F401RE, Arduino Uno, and Nordic nRF52840 DK.
- Overview
- Hardware / Tools Used
- Labs Included
- Repository Structure
- What This Repository Shows
- Notes
- Contributing
- License
The goal of this repository is to keep all completed course labs in one place and document both the firmware implementation and the hardware/software testing process.
The repository includes work with:
- GPIO output control
- LED blinking and timing
- oscilloscope-based signal verification
- timer interrupt-based periodic tasks
- low-power modes: Sleep, Stop, and Standby
- current measurement and battery life estimation
- RTC wake-up configuration
- UART communication between STM32 and Arduino
- serial CSV-style logging to PC
- BLE advertising using nRF52840 DK
- BLE scanning and connection verification using nRF Connect
- GATT services, characteristics, notify behavior, and advertising interval modification
- STM32 Nucleo-F401RE
- Arduino Uno
- Nordic nRF52840 DK
- STM32CubeMX
- STM32CubeIDE
- STM32 HAL library
- Arduino IDE
- Visual Studio Code
- nRF Connect extension
- nRF Connect SDK
- Zephyr RTOS
- nRF Connect mobile app
| Lab | Title | Summary |
|---|---|---|
| Lab 1 | Flashing LED | A basic GPIO lab where an external LED was connected to the STM32 Nucleo-F401RE and toggled with a visible delay, configured via CubeMX and HAL_GPIO_TogglePin(), verified with an oscilloscope. |
| Lab 2 | Battery Life Estimation with Sleep Mode | A low-power lab where the STM32 periodically activates a buzzer using a TIM2 interrupt and spends the rest of the cycle in Sleep mode, with current measurement used to estimate battery lifetime. |
| Lab 3A | Stop Mode | A low-power lab demonstrating Stop mode, where the MCU wakes from a button interrupt, restores the system clock, and retains SRAM content (proven via a wake counter). |
| Lab 3B | Standby Mode | A continuation of the low-power task, showing how Standby mode differs from Stop mode, including reset-after-wake behavior and loss of volatile SRAM state. |
| Lab 4 | UART Communication with Arduino | A communication lab where STM32 wakes periodically, requests button count data from Arduino over UART, logs it to PC in CSV format, and returns to Stop mode. |
| BLE Tasks 6-8 | nRF52840 BLE Advertising, Connection, and Modification | BLE tasks covering nRF52840 DK advertising setup, connection verification with the nRF Connect mobile app, GATT service inspection, and modifying the device name and advertising interval. |
Microcontrollers-Interface-and-Programming/
├── Lab1_Flashing_LED/
├── Lab2_Sleep_Mode_Battery_Life/
├── Lab3A_Stop_Mode/
├── Lab3B_Standby_Mode/
├── Lab4_UART_With_Arduino/
└── Microcontrollers_BLE_Tasks_6_7_8/
This repository reflects my practical work in microcontroller programming, especially:
- configuring peripherals in CubeMX
- writing embedded C firmware
- using STM32 HAL functions
- working with timers and interrupts
- applying low-power design principles
- communicating between microcontrollers
- testing with real hardware and oscilloscope evidence
- setting up Zephyr/nRF Connect SDK projects
- configuring BLE advertising and GATT behavior
- connecting theory, code, and observed results from actual lab testing
Some folders include full project files, while others include the main source/configuration files and report evidence. For BLE tasks, the final uploaded code includes the important main.c, prj.conf, and tested bt_ready() variations used during the lab.
This is a personal academic repository, so it isn't actively seeking code contributions. That said, if you spot an error or have a suggestion, feel free to open an issue. See CONTRIBUTING.md for details, including a note on academic integrity.
This project is licensed under the MIT License.