28 Pins microcontroller development board
The 28 Pins is a microcontroller board based on the ATmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. The 28 pins differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2 (Atmega8U2 up to version R2) programmed as a USB-to-serial converter. Revision 2 of the 28 pins board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into DFU mode. The board manufacturing quality was very good and satisfactory. I liked the review done by the personnel and instant feedback on the pass/fail status of the gerber files.
![](https://file.pcbway.com/project/17/07/18/032956753.jpg)
![](https://file.pcbway.com/project/17/07/18/033002541.jpg)
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