Tu as les cartes comme les STM32 Discovery à base d'ARM bien rapides, qui contiennent une tartinée d'I/O en plus de pas mal d'autres fonctions qui pourraient t'intéresser vu que tu as l'air d'être bricolleur :
http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/LN1199/PF259098
Key Features
STM32F401VCT6 microcontroller featuring 256 KB of Flash memory, 64 KB of RAM in an LQFP100 package
On-board ST-LINK/V2 with selection mode switch to use the kit as a standalone ST-LINK/V2 (with SWD connector for programming and debugging)
Board power supply: through USB bus or from an external 5 V supply voltage
External application power supply: 3 V and 5 V
L3GD20, ST MEMS motion sensor, 3-axis digital output gyroscope.
LSM303DLHC, ST MEMS system-in-package featuring a 3D digital linear acceleration sensor and a 3D digital magnetic sensor.
MP45DT02, ST MEMS audio sensor, omnidirectional digital microphone
CS43L22, audio DAC with integrated class D speaker driver
Eight LEDs:
LD1 (red/green) for USB communication
LD2 (red) for 3.3 V power on
Four user LEDs: LD3 (orange), LD4 (green), LD5 (red) and LD6 (blue)
Two USB OTG LEDs: LD7 (green) VBus and LD8 (red) over-current
Two pushbuttons (user and reset)
USB OTG with micro-AB connectorExtension header for LQFP100 I/Os for a quick connection to the prototyping board and an easy probing