The "UNO V3 Extension" in the context of STM32 typically refers to a shield or adapter board that allows Arduino UNO R3-compatible shields to be used with STM32-based development boards (like STM32 Nucleo or Blue Pill).
Key Features of UNO V3 Extension for STM32:
1. Arduino UNO R3 Pinout Compatibility
- Matches the standard UNO R3 header layout (D0-D13, A0-A5, power pins).
- Allows Arduino shields (e.g., LCD, Ethernet, motor drivers) to plug into an STM32 board.
2. STM32 Microcontroller Support
- Designed for STM32 boards (e.g., STM32F103C8T6 Blue Pill, Nucleo-64).
- May include voltage level shifting (5V ↔ 3.3V) since STM32 is 3.3V logic.
3. Additional Peripherals (Varies by Board)
Some versions include:
- USB-UART (CH340/CP2102) for programming.
- MicroSD card slot.
- Onboard ST-Link (for debugging).
Common Use Cases
- Prototyping with Arduino shields on STM32.
- Reusing UNO R3 accessories (sensors, displays) with STM32’s higher performance.
- Educational purposes (easier transition from Arduino to STM32).
Example: STM32 + UNO V3 Extension Setup
- Board: STM32F103C8T6 (Blue Pill) + UNO V3 adapter.
- Shield: Arduino Motor Shield (L298N).
- Result: Control motors using STM32 while keeping the shield’s UNO R3 compatibility.
Limitations
⚠️ Not all Arduino shields work perfectly due to:
- Voltage mismatch (STM32 = 3.3V, Arduino = 5V).
- Library compatibility (may need HAL/LL instead of Arduino code).
Where to Buy?
AliExpress, Amazon, eBay (search "STM32 UNO V3 Extension Board").
Example:
- "WeAct STM32F103C8T6 UNO V3 Adapter"
- "NUCLEO-STM32 UNO R3 Expansion Board"
Do You Need It?
✅ Yes if: You want to reuse Arduino shields with STM32.
❌ No if: You’re using direct STM32 peripherals (no shield needed).
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