20 Pin AVR Relay Development Board

Replacement: None. There is no direct replacement for this product. This page is for reference only.

Development board for 20 pin AVR microcontrollers with power supply circuit, crystal oscillator circuit, RS232 port, 10 pin STK ICSP port, 4 relay output, and 4 optocoupler isolated inputs.

Board does not come with AVR installed. Please see a list of related ICs below.

  • FR-4, 1.5 mm (0.062"), green solder mask, white silkscreen component print
  • Four mounting holes 3.3 mm (0.13")
  • ICSP 5x2 pin connector for in-circuit programming with AVR Programmers
  • Voltage regulator +5V, 7805 and filtering capacitors
  • Quartz crystal oscillator circuit - 10MHz
  • Reset IC ZM33064
  • Status LED connected to PB4
  • Power plug-in jack
  • DIL20 microcontroller socket
  • RS232 DB9 female connector
  • 4 optocoupler isolated inputs with screw terminals
  • Input status LEDs
  • 4 relay outputs with 5A/250VAC contacts with screw terminals
  • Output status LEDs
  • 100x80 mm (3.9x3.15")


Looking for answers to technical questions?

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  • Member #147286 / about 12 years ago / 1

    Any idea on when more of these will be available?

  • This is such a cool product! Perfectly matched what I needed for my project. The right number of I/Os, opto-isolated inputs and NPN-driven relay outputs. Awesome.
    I only wish that some company out there would make something similar for Freescale's MCUs, but oh well. I'm an HC11 guy. ToMAYto/toMAToe.

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