The doppler is a Cortex M4F Microcontroller + FPGA development board. It comes in the same tiny form factor similar to a Teensy and is open source.


• 120Mhz ARM Cortex M4F MCU 512KB Flash (Microchip ATSAMD51G19A) with FPU
• FPGA 5000 LUT, 1MBit RAM, 6 DSP Cores,OSC, PLL (Lattice ICE40UP5K)
• Arduino IDE compatible
• Breadboard friendly (DIL48)
• Micro USB
• Power over USB or external via pin headers
• VCC 3.5V …. 5.5V • All GPIO Pins are 3.3V
• 1 LED connected to SAMD51
• 4 x 4 LED Matrix (connected to FPGA)
• 2 User buttons (connected to FPGA)
• AREF Solder Jumper
• I2C (need external pullup), SPI, QSPI, USART Pins
• 2 DAC pins, 10 ADC pins
• Pinout here
• Full open source toolchain
• SWD programming pin headers
• Double press reset to enter the bootloader
UF2 Bootloader with Firmwareupload via simple USB stick mode (Mass Storage Device)

Communications, hardware design

Ideation & Software: Sven Braun

Open Source

Create Digital Music