Experiments, Prototypes & Notes with the micro:bit v2.21

This repository contains my projects, experiments, and notes using the micro:bit v2.21, built on the nrf52833 microcontroller.
It serves as a playground for testing ideas, learning embedded concepts, and building small prototypes.

Goals:

  • Explore nrf52833 features with microbit::hal
  • Interface with peripherals (GPIO, I2C, SPI, UART, ADC, PWM)
  • Experiment with power management, timers, interrupts
  • Integrate with sensors and modules (temperature, motion, light, etc.)

⚙️ Hardware Used

  • micro:bit v2.21
  • Breadboard & jumper wires
  • Sensors: DHT11, MPU6050, BH1750, HW-416A, HC-SR04, HW-504, etc
  • Power: USB / battery / external supply

🧩 Projects & Experiments

Project NameDescriptionStatus
blinkyblink onboard led✅ Done
led_circleonboard led matrix circle controlled by bsc✅ Done
uart_echoconnect MCu to PC through UART from BSC✅ Done
xxxplanned⏳ Planned

More to come.

🔧 Tools & Tech Stack

  • Languages: Rust
  • IDEs: VSCode
  • Libraries: microbit::bsc, microbit::hal, panic_rtt_target, cortex_m_rt
  • Protocols: GPIO, MQTT, UDP, TCP
  • Flash storage & OTA update experiments (planned)

📎 Notes

This is an open lab space – not a polished library or framework. Things may be messy, experimental, or half-finished. If you're tinkering with the micro:bit too, feel free to fork, comment, or share ideas.

📺 Demos

📚 Source led_circle

led-matrix  :
section              size        addr
.vector_table         256         0x0
.text                6812       0x100
.rodata               856      0x1b9c
.data                   0  0x20000000
.gnu.sgstubs            0      0x1f00
.bss                 1092  0x20000000
.uninit                 0  0x20000444
.debug_loc          14715         0x0
.debug_abbrev        3137         0x0
.debug_info         69578         0x0
.debug_aranges        648         0x0
.debug_ranges       12304         0x0
.debug_str          76193         0x0
.comment              153         0x0
.ARM.attributes        56         0x0
.debug_frame         1260         0x0
.debug_line         21193         0x0
Total              208253