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The MT-DB-U4 is a development board for the Atmel ATmega32U4 USB microcontroller. The board has 40 pins in a dual inline configuration with 100 mil pin spacing and 700 mil row spacing which allows for easy mounting on a breadboard. It includes a mini USB connector, status LED, 16MHz crystal, reset button, HWB boot jumper, and ISP header pads. A bootloader comes preinstalled which allows programming of the chip over USB without an external programmer. An ISP header is available which can be used with an external programmer. This header can be reconfigured to allow the MT-DB-U4 itself to be used as an ISP programmer (hex file available on website), or to be used as a SPI master or slave. The board can be powered via USB at 5V or it can be externally powered (3V - 5.5V). All pins are routed to headers, including those used by on-board hardware. The chip can be clocked externally, and the board is compatible with HV programming. The USB connections are also routed to header pins, which allows for panel-mount USB connectors. The PCB is high-quality with ENIG (gold-plated) finish, red soldermask, and white screenprinting showing the pinout and Arduino pin numbering.
There are two 3mm mounting holes (~5mm pad). It measures approximately 2.1” x 0.9” (52mm x 23mm) and is 0.062” (1.6mm) thick.
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