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28Pins 5V

This microcontroller board is an amazing tool for hobbyists and robotics fans allowing building devices that can sense inputs from switches or sensors and then control motors, lights or any other output one can think of.

The 28Pins open source board is based on Arduino project and was developed by FEDEVEL Academy to help people learn how to design their own boards.

It is compatible with Arduino UNO Rev. 3 microcontroller board, including couple of useful improvements:

• Both RESET pins (16U2 and 328P) are driven through an open drain buffer. This means improved RESET quality and it adds an option to debug the microcontrollers through dWire interface.

• ATMEGA16U2 can be used as an universal AVRISP MKII programmer. Once you change the firmware, you can use it to program the onboard ATMEGA328P or any other board.

• Micro USB (use any mobile phone or tablet charger to power the board), User Button added, DFU Disable jumper, dWire debugger (if correct firmware is used, 16U2 can work as an dWire debugger).


ATMEGA328P microcontroller:

• FLASH: 32kB / EEPROM: 1kB / RAM: 2kB
• Clock: 16MHz (for +5V) / 10MHz (for +3.3V)
• Up to 20 input / output pins from which:
   20x digital input/output
   6x PWM output
   6x Analog inputs (10bit AD)
   1x Serial port, 1x SPI, 1x I2C
   1x User LED
   1x User Buton, 1x Reset Button

ATMEGA16U2 microcontroller:

• FLASH: 16kB / EEPROM: 512B / RAM: 512B
• Clock: 16MHz (for +5V) / 8MHz (for +3.3V)
• 4x Digital input / output
• 2x User LED
• 1x USB
• 1x SPI
• 1x Serial port (shared with 328P)
• DFU programming support
• AVRISP MKII firmware available

Further features:

• ATMEGA328P can be programmed from ATMEGA16U2
• SPI programming support
• dWire debugging support
• On board +3.3V / 1.5A regulator
• Dimensions: 68.6 x 53.4 mm
• Power input: micro USB or soldered wires
• Power voltage: +5V
• no firmware preinstalled
• Extended temperature range of -20°C to +85°C
• RoHS

For the documentation, license terms, firmware compilation and flashing, and latest updates visit the Downloads section or the official 28Pins site.

Personal and commercial use of the 28Pins project documentation is completely free, just follow the Attribution-ShareAlike 3.0 Unported licence.
Last update: January 02, 2016