Updated the bogdan.micu2009 project page with the KiCad Schematic and week 8 Log. (#764)

* Updated the bogdan.micu2009 project page with the KiCad Schematic and Week 8 Log.

* Compressed the SVG Schematic.

Author: bogdanmicu

website/versioned_docs/version-fils_en/project/2026/bogdan.micu2009/AIO_BiometricHardwareSecurityKey_Micu_Bogdan.svg

@@ -27,7 +27,7 @@ The motivation for this project was to create a dedicated, self-contained physic
     +----------------+   +----+----------+----------+-------+   +----------------+
                               |          |          |
                          UART |      I2C |     GPIO |
-                        (TX/RX)   (SDA/SCL)  (CLK/DT/SW)
+                        (TX/RX)   (SDA/SCK)  (CLK/DT/SW)
                               |          |          |
                               v          |          v
                     +---------+--+       |    +-----+---------+
@@ -59,15 +59,17 @@ The motivation for this project was to create a dedicated, self-contained physic
     +--------------------+          +----------------------------+
 
     +--------------------+          +----------------------------+
-    |  AS608             |   TX  -->|  UART RX  (pin TBD)        |
-    |  Fingerprint       |          |                            |
-    |  Sensor            |   RX <--+|  UART TX  (pin TBD)        |
+    |  AS608             |   VCC -->|  3V3                        |
+    |  Fingerprint       |   VA  -->|  3V3                        |
+    |  Sensor            |   GND -->|  GND                        |
+    |                    |   TX  -->|  UART RX  (PA10)            |
+    |                    |   RX <--+|  UART TX  (PA9)             |
     +--------------------+          +----------------------------+
     (* sensor arrived with pre-crimped connector; requires adapter before wiring)
 
     +--------------------+                                         +--------------------+
     |  SH1106            | SDA +-----------------------------------+|  DS3231            |
-    |  OLED Display      +---->|  I2C Bus — PB7 (SDA) / PB6 (SCL) |<+  RTC Module       |
+    |  OLED Display      +---->|  I2C Bus - PB7 (SDA) / PB6 (SCL) |<+  RTC Module       |
     |  (addr: 0x3C)      | SCL |  shared by both devices          ||  (addr: 0x68)      |
     |                    +---->|                                   ||                    |
     +--------------------+     +------------------+----------------+ +--------------------+
@@ -76,18 +78,18 @@ The motivation for this project was to create a dedicated, self-contained physic
                                          NUCLEO I2C peripheral
 
     +--------------------+          +----------------------------+
-    |  EC11 Rotary       |  CLK  -->|  PA0 — GPIO input          |
+    |  EC11 Rotary       |  CLK  -->|  PA0 - GPIO input          |
     |  Encoder           |          |                            |
-    |  + Push-Button     |  DT   -->|  PA1 — GPIO input          |
+    |  + Push-Button     |  DT   -->|  PA1 - GPIO input          |
     |                    |          |                            |
-    |                    |  SW   -->|  PA4 — GPIO input          |
+    |                    |  SW   -->|  PA4 - GPIO input          |
     +--------------------+          +----------------------------+
 
-    +--------------------+          +----------------------------+
-    |  USB               |  D−   -->|  PA11 — USB D−             |
-    |  (to Host PC)      |          |                            |
-    |                    |  D+   -->|  PA12 — USB D+             |
-    +--------------------+          +----------------------------+
+    +-----------------------------+
+    |  STM32 User USB Port        |
+    |  (to Host PC; on-board)     |
+    |  No external D+/D− wiring   |
+    +-----------------------------+
 ```
 
 ## Log
@@ -104,75 +106,83 @@ The motivation for this project was to create a dedicated, self-contained physic
 - Compared alternatives for each component (e.g. internal RTC vs DS3231 external module, I2C vs SPI display).
 - Placed purchase orders for all components.
 
-### Week 6 (Components Arrive — Initial Testing)
+### Week 6 (Components Arrive - Initial Testing)
 
 - All components arrived; began a first testing phase powered via USB only (no battery yet).
 - Verified I2C bus connectivity for the SH1106 OLED and DS3231 RTC on PB7 (SDA) and PB6 (SCL).
 - Verified GPIO connectivity for the EC11 rotary encoder on PA0 (CLK), PA1 (DT), and PA4 (SW).
 
-### Week 7 (Extended Testing — Known Issues)
+### Week 7 (Extended Testing - Known Issues)
 
 - Continued testing and identified the following issues to address before final integration:
-  1. **Fingerprint sensor wiring** — The AS608 module arrived with a pre-crimped connector head; the wires cannot be inserted directly into a breadboard. A connector adapter or manual re-crimping is required before it can be wired to the MCU.
-  2. **MCU power source** — To run from the 9V Li-ion battery instead of USB, the NUCLEO onboard jumper must be moved from the `STLK` position to `VIN 5V`.
-  3. **External RTC** — Switching to the DS3231 external RTC module to ensure accurate timestamps at all times even when the device is switched off or loses power.
-  4. *(Optional)* **External USB-C module** — Soldering an external USB-C breakout would allow cleaner cable management and a more polished physical build.
+  1. **Fingerprint sensor wiring** - The AS608 module arrived with a pre-crimped connector head; the wires cannot be inserted directly into a breadboard. A connector adapter or manual re-crimping is required before it can be wired to the MCU.
+  2. **MCU power source** - To run from the 9V Li-ion battery instead of USB, the NUCLEO onboard jumper must be moved from the `STLK` position to `VIN 5V`.
+  3. **External RTC** - Switching to the DS3231 external RTC module to ensure accurate timestamps at all times even when the device is switched off or loses power.
+  4. *(Optional)* **External USB-C module** - Soldering an external USB-C breakout would allow cleaner cable management and a more polished physical build.
   5. **External EEPROM Module** - Exploring the possibility of not using the internal flash, and instead adding an external EEPROM Module to store the hashed passwords. [Link_OptimusDigital](https://www.optimusdigital.ro/en/memories/632-modul-eeprom-at24c256.html?srsltid=AfmBOorouiIrK-KwPHIZN0sNcZ-w4__qtdYFp7VfwaqIHPfRR86A0zXu)
 
+### Week 8 (Integration Progress)
+
+- Continued the first integration steps and made the following updates:
+  1. **Fingerprint sensor wiring** - Soldered the AS608 wires.
+  2. **External EEPROM module** - Purchased an EEPROM module, but decided to use the internal flash as the main storage option and keep the EEPROM as a backup.
+  3. **USB connectivity** - Dropped the USB-C breakout board idea and switched to using the STM32 User USB port for PC - MCU communication.
+  4. **Firmware testing** - Extended the component testing code.
+  5. **New issue** - Battery wires need to be soldered before use.
+
 ## Hardware
 
 The project centres on a NUCLEO-U545RE-Q development board as the microcontroller. An AS608 optical fingerprint sensor handles biometric authentication over UART. A 1.3" SH1106 OLED display and a DS3231 RTC module share the I2C bus, the RTC keeps accurate time for TOTP generation even while unplugged, backed by a coin-cell battery. An EC11 rotary encoder with integrated push-button provides all navigation input via GPIO. A 9V 3700 mWh Li-ion rechargeable battery makes the device fully portable. Everything is wired on a breadboard with jumper wires and supporting passives. An optional future goal is implementing ARM TrustZone to secure cryptographic operations and password storage.
 
-**NUCLEO-U545RE-Q (Central Hub)** — Runs the async Rust firmware (embassy-stm32). Stores password strings and TOTP secret seeds in flash, orchestrates all peripherals, computes HMAC-SHA1 hashes, and drives the USB HID stack.
+**NUCLEO-U545RE-Q (Central Hub)** - Runs the async Rust firmware (embassy-stm32). Stores password strings and TOTP secret seeds in flash, orchestrates all peripherals, computes HMAC-SHA1 hashes, and drives the USB HID stack.
 
-**AS608 Fingerprint Sensor** — Connected over UART. The device stays in a locked idle state until a recognised fingerprint is presented. On a match, it signals the MCU to unlock the vault.
+**AS608 Fingerprint Sensor** - Connected over UART. The device stays in a locked idle state until a recognised fingerprint is presented. On a match, it signals the MCU to unlock the vault.
 - *Connection*: UART TX/RX to USART peripheral on the NUCLEO board.
 
-**SH1106 OLED Display (1.3")** — Shows the lock screen, the scrollable account list, and live TOTP codes.
+**SH1106 OLED Display (1.3")** - Shows the lock screen, the scrollable account list, and live TOTP codes.
 - *Connection*: I2C (SDA/SCL) shared bus with the RTC module.
 
-**DS3231 Real-Time Clock** — Provides a precise Unix timestamp at all times, even when the device is unplugged, via its onboard coin-cell backup.
+**DS3231 Real-Time Clock** - Provides a precise Unix timestamp at all times, even when the device is unplugged, via its onboard coin-cell backup.
 - *Connection*: I2C (SDA/SCL) shared bus with the OLED display.
 
-**EC11 Rotary Encoder (with push-button)** — The sole physical input. Rotating scrolls the account menu; pressing selects an account to either inject a password or display a TOTP code.
+**EC11 Rotary Encoder (with push-button)** - The sole physical input. Rotating scrolls the account menu; pressing selects an account to either inject a password or display a TOTP code.
 - *Connection*: Three GPIO pins (CLK, DT, SW).
 
-**USB HID (to host PC)** — The NUCLEO's USB port enumerates as a composite HID keyboard device. When a password injection is triggered, the firmware sends keystrokes directly to the connected computer.
+**USB HID (to host PC)** - The NUCLEO's USB port enumerates as a composite HID keyboard device. When a password injection is triggered, the firmware sends keystrokes directly to the connected computer.
 
 ### Pin Assignments
 
 | Pin  | Signal                        | Peripheral                                |
 |------|-------------------------------|-------------------------------------------|
-| PA0  | GPIO input — CLK              | EC11 Rotary Encoder                       |
-| PA1  | GPIO input — DT               | EC11 Rotary Encoder                       |
-| PA4  | GPIO input — SW (push-button) | EC11 Rotary Encoder                       |
-| PA11 | USB D−                        | USB HID (to host PC)                      |
-| PA12 | USB D+                        | USB HID (to host PC)                      |
+| PA0  | GPIO input - CLK              | EC11 Rotary Encoder                       |
+| PA1  | GPIO input - DT               | EC11 Rotary Encoder                       |
+| PA4  | GPIO input - SW (push-button) | EC11 Rotary Encoder                       |
+| -    | USB (STM32 User USB port)     | USB HID (to host PC; on-board connector)  |
 | PB6  | I2C SCL                       | SH1106 OLED + DS3231 RTC (shared I2C bus) |
 | PB7  | I2C SDA                       | SH1106 OLED + DS3231 RTC (shared I2C bus) |
-| TBD  | UART TX                       | AS608 Fingerprint Sensor                  |
-| TBD  | UART RX                       | AS608 Fingerprint Sensor                  |
+| PA9  | UART TX                       | AS608 Fingerprint Sensor                  |
+| PA10 | UART RX                       | AS608 Fingerprint Sensor                  |
 
 ### Photos
 
-![Hardware setup — NUCLEO-U545RE-Q with OLED display, Rotary Encoder, DS3231 RTC module, and breadboard](hardware.webp)
+![Hardware setup - NUCLEO-U545RE-Q with OLED display, Rotary Encoder, DS3231 RTC module, and breadboard](hardware.webp)
 
 ### Schematics
 
-<!-- KiCAD schematic in SVG format will be placed here -->
+![Schematics](./AIO_BiometricHardwareSecurityKey_Micu_Bogdan.svg)
 
 ## Bill of Materials
 
 | Device | Usage | Price |
 |--------|-------|-------|
-| [NUCLEO-U545RE-Q](https://ro.mouser.com/ProductDetail/STMicroelectronics/NUCLEO-U545RE-Q?qs=mELouGlnn3cp3Tn45zRmFA%3D%3D) | Main microcontroller — runs Embassy/Rust firmware, stores credentials, computes TOTP | 125 RON |
+| [NUCLEO-U545RE-Q](https://ro.mouser.com/ProductDetail/STMicroelectronics/NUCLEO-U545RE-Q?qs=mELouGlnn3cp3Tn45zRmFA%3D%3D) | Main microcontroller - runs Embassy/Rust firmware, stores credentials, computes TOTP | 125 RON |
 | [AS608 Optical Fingerprint Sensor](https://www.optimusdigital.ro/en/optical-sensors/12995-as608-optical-fingerprint-sensor-fingerprint-module.html?search_query=fingerprint&results=3) | Biometric authentication over UART | 70 RON |
 | [1.3" SH1106 OLED Display](https://www.emag.ro/afisaj-oled-sh1106-oled-i2c-3-5v-35-4-x-33-5-x-4-3-mm-alb-afisaj-lcd-clar-compatibil-cu-placi-arduino-ao10/pd/DF3FC1YBM/?ref=history-shopping_481143298_158626_1) | Displays lock screen, account menu, and TOTP codes over I2C | 43 RON |
 | [DS3231 Real-Time Clock Module](https://www.optimusdigital.ro/en/others/12402-ds3231-real-time-clock-module.html?search_query=DS3231&results=6) | Provides accurate Unix timestamps for TOTP over I2C | 16 RON |
 | [EC11 Rotary Encoder with push-button](https://www.emag.ro/modul-de-codare-rotativ-ky-040-ai672-s106/pd/DJBVFDMBM/?ref=history-shopping_481358403_38837_2) | Scroll and select accounts via GPIO | 21 RON |
 | [9V 3700 mWh Li-ion Rechargeable Battery](https://www.emag.ro/baterie-nuoxing-9v-li-ion-3700mwh-ncarcare-rapida-type-c-verde-1-buc-stormtime064/pd/DYVW9CYBM/?ref=history-shopping_481358403_190246_1) | Portable power source | 57 RON |
-| Breadboard, jumper wires, battery cables, resistors, coin-cell batteries, USB-C module & extras | Prototyping and connectivity | 86 RON |
-| **Total** | | **418 RON** |
+| Breadboard, jumper wires, battery cables, resistors, coin-cell batteries, USB-C module & extras | Prototyping and connectivity | 95 RON |
+| **Total** | | **427 RON** |
 
 ## Software
 
@@ -194,11 +204,11 @@ The project centres on a NUCLEO-U545RE-Q development board as the microcontrolle
 
 ## Links
 
-1. [TOTP Algorithm — RFC 6238](https://datatracker.ietf.org/doc/html/rfc6238)
-2. [HOTP Algorithm — RFC 4226](https://datatracker.ietf.org/doc/html/rfc4226)
-3. [Embassy — async embedded Rust framework](https://embassy.dev)
+1. [TOTP Algorithm - RFC 6238](https://datatracker.ietf.org/doc/html/rfc6238)
+2. [HOTP Algorithm - RFC 4226](https://datatracker.ietf.org/doc/html/rfc4226)
+3. [Embassy - async embedded Rust framework](https://embassy.dev)
 4. [AS608 Fingerprint Sensor Datasheet](https://handsontec.com/dataspecs/sensor/AS608%20Finger%20print%20Sensor.pdf)
-5. [AS608 Example with YT Video] (https://learn.adafruit.com/adafruit-optical-fingerprint-sensor)
+5. [AS608 Example with YT Video](https://learn.adafruit.com/adafruit-optical-fingerprint-sensor)
 6. [SH1106 Controller Datasheet](https://www.displayfuture.com/Display/datasheet/controller/SH1106.pdf)
 7. [DS3231 RTC Module Datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/DS3231.pdf) 
 8. [EC11 Rotary Encoder Datasheet](https://tech.alpsalpine.com/e/products/detail/EC11E15244G1/)