Olimex STM32-H405
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The board as it appears on the Velxio canvas, with its full pin map
read live from the simulator (regenerated by scripts/gen-boards.mjs,
so it always matches what you can wire).

Family: STM32 · Languages: Arduino C++
About this board
Section titled “About this board”Olimex’s STM32F405RG header board: Cortex-M4 with FPU, in an industrial-style layout rather than the hobby pill footprint.
Same STM32duino core and the same Arduino API surface as the rest of the family — the board is here so that projects designed around Olimex hardware can be prototyped against the pinout they will actually ship on.
Start here
Section titled “Start here”New Olimex STM32-H405 project opens the editor with this board and a working blink sketch. STM32 boards need a paid plan — see plans.
Pins (24)
Section titled “Pins (24)”- 3V3
- GND
- PA0
- PA1
- PA2
- PA3
- PB6
- PB7
- PB8
- PB9
- PC0
- PC1
- 5V
- GND
- PC12
- PC10
- PC11
- PA4
- PA5
- PA6
- PA7
- PB0
- PB1
- PB10
Every pin above is clickable on the canvas — click one to start a wire. Board-level behavior, quirks and example links live on the family page.