Project/andrei.tanase1012 (#1389)

* .

* 1

* Project description

* Project description

* Project Documentation

* Project Documentation

* Project Documentation

* KiCad Scheme added

* Week 9-11 added

* Compressed the kicad schematic

* Compressed kicad schematic

* Week 12-14 and changes

Author: Andrei-Tase

website/versioned_docs/version-fils_en/project/2026/andrei.tanase1012/image1.webp

@@ -81,10 +81,16 @@ I began the hardware assembly phase by verifying each component's integrity upon
 ### Week 9-11
 I completed the hardware assembly by integrating all peripherals with the STM32 Nucleo-U545RE-Q into a unified system. This involved interfacing the PMS5003 and AHT20+BMP280 sensors for real-time environmental data collection, connecting the I2C OLED for local status updates, and assembling the IRLZ44N MOSFET circuit to safely control the 12V fan via PWM. By establishing a common ground and stable power distribution through the DC barrel jack, the system is now fully interconnected, with the microcontroller successfully communicating across all sensor and actuator loops to form a functional prototype.
 
+### Week 12-14
+During this period, I finished writing and testing the Rust firmware for the STM32 Nucleo. The microcontroller now successfully reads live data from the environmental and dust sensors, displays the real-time stats on the OLED screen, and automatically controls the 12V fan speed based on air quality. The software is fully stable, and the air purifier is now operating autonomously.
+
 ## Hardware
 
 The system is built around an STM32 Nucleo-U545RE-Q microcontroller, which interfaces with a Plantower PMS5003 laser sensor via UART for high-precision PM2.5 monitoring. Environmental context is provided by an AHT20 + BMP280 combo breakout (temperature, humidity, and pressure) and a 0.96" OLED display (SSD1306), both communicating over a shared I2C bus. The filtration is handled by a 12V DC fan and a HEPA filter, controlled through a custom motor drive circuit featuring an IRLZ44N logic level MOSFET, a 1N4007 flyback diode, and a 10kΩ pull-down resistor. The entire setup is powered by a 12V DC adapter and integrated on a standard 830 point breadboard.
 
+![Image1](./image1.webp)
+![Image2](./image2.webp)
+
 ## Schematics
 
 ![Schematics](./KicadScheme.svg)
@@ -98,7 +104,7 @@ The system is built around an STM32 Nucleo-U545RE-Q microcontroller, which inter
 | [AHT20 + BMP280](https://sigmanortec.ro/modul-senzor-aht20-si-bmp280-temperatura-umiditate-presiune-28-5v) | Temperature, humidity, and pressure (I2C) | [~12,26 RON](https://sigmanortec.ro/modul-senzor-aht20-si-bmp280-temperatura-umiditate-presiune-28-5v) |
 | [0.96" OLED Display](https://sigmanortec.ro/display-oled-096-i2c-iic-alb) | Visual data interface (I2C) | [~16,95 RON](https://sigmanortec.ro/display-oled-096-i2c-iic-alb) |
 | 12V PC Case Fan | Air circulation and filtration | Already owned |
-| [HEPA Filter](https://filtru-aspirator.compari.ro/irobot/roomba-800-900-series-filtru-hepa-p802881633/#) | Particulate removal | [~11 RON](https://filtru-aspirator.compari.ro/irobot/roomba-800-900-series-filtru-hepa-p802881633/#) |
+| [2x HEPA Filter](https://www.fix-shop.ro/piese-de-schimb-irobot-roomba-irobot-roomba-900-series/irobot-roomba-800-900-series-filtru-hepa/?utm_source=compari.ro&utm_medium=cpc&utm_campaign=Filtre&utm_content=VACC-IRO-010) | Particulate removal | [~28 RON](https://www.fix-shop.ro/piese-de-schimb-irobot-roomba-irobot-roomba-900-series/irobot-roomba-800-900-series-filtru-hepa/?utm_source=compari.ro&utm_medium=cpc&utm_campaign=Filtre&utm_content=VACC-IRO-010) |
 | [IRLZ44N MOSFET](https://ro.mouser.com/datasheet/3/70/1/Infineon_IRLZ44N_DataSheet_v01_01_EN.pdf) | PWM fan power control | [~7,65 RON](https://ro.mouser.com/ProductDetail/942-IRLZ44NPBF) |
 | [1N4007 Diode](https://diotec.com/request/datasheet/1n4001.pdf) | Circuit protection (flyback) | [~0,65 RON](https://ro.mouser.com/ProductDetail/637-1N4007) |
 | [10kΩ Resistor](https://ro.mouser.com/datasheet/3/508/1/YAGEO_CFR_DATASHEET.pdf) | MOSFET gate pull-down | [~0,43 RON](https://ro.mouser.com/ProductDetail/603-CFR-25JT-52-10K) |
@@ -118,9 +124,9 @@ The system is built around an STM32 Nucleo-U545RE-Q microcontroller, which inter
 | [embassy-time](https://github.com/embassy-rs/embassy) | Time and delay library | Handling delays and timeouts |
 | [ssd1306](https://github.com/adafruit/adafruit_ssd1306) | Display driver for OLED | Driving the visual display |
 | [embedded-graphics](https://github.com/embedded-graphics/embedded-graphics) | 2D graphics library | Rendering UI and text |
-| [aht20](https://github.com/Seeed-Studio/Seeed_Arduino_AHT20) | Environmental sensor driver | Reading humidity and temperature |
-| [bmp280-rs](https://github.com/pietgeursen/bmp280-rs) | Atmospheric pressure driver | Extracting barometric pressure data |
-| [pms5003](https://github.com/janjongboom/mbed-pms5003) | UART sensor parser | Processing PM2.5 concentration data |
+| [heapless](https://github.com/rust-embedded/heapless) | Static memory allocation | Safely formatting UI text strings without dynamic RAM allocation |
+| [embedded-hal-bus](https://github.com/rust-embedded/embedded-hal) | I2C Bus Manager | Safely sharing the physical I2C wires between the OLED and sensors |
+| [panic-probe](https://github.com/knurling-rs/defmt) | Panic handler | Catching and reporting system faults to the debugger |
 | [defmt](https://github.com/knurling-rs/defmt) | Embedded logging framework | Efficiently logging debug data |
 | [defmt-rtt](https://github.com/knurling-rs/defmt) | RTT log transport | Sending logs to debugger |
 
@@ -129,3 +135,4 @@ The system is built around an STM32 Nucleo-U545RE-Q microcontroller, which inter
 1. [Embedded Rust 101 course labs](https://embedded-rust-101.wyliodrin.com/docs/fils_en/lab/01)
 2. [Embassy book](https://embassy.dev/book/#_what_is_embassy)
 3. [Nucleo-U545RE-Q user manual](https://www.st.com/resource/en/user_manual/um3062-stm32u5-nucleo64-board-mb1841-stmicroelectronics.pdf)
+4. [BMP280 datasheet](https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp280-ds001.pdf)