Sunday, December 26, 2010

New self made toy for UART programming

I have had very few time over the last weeks, so all hobby projects were paused in this time.
But now i have some spare time again - thx to Xmas and holidays!

The current theme in the technical engineering school i visit is "UART register programming". Sounds great, right? Just good enough for an nerd like me.
Sadly we only "program" the UART on paper... sounds sick - right? I was very unsatisfied with this fact and so i designed a small circuit arround an AVR. Now i am able to test the UART programming on the PC side. I learned much by this project.

The features of the board:
  • Serial communication using RS232, 9600 baud, 8 data bits, no parity, 1 stop bit.
  • 5 digital outputs (connected to LEDs)
  • 6 digital inputs
  • 1 analog input (8 bit ADC, Umax = 2,56 V)
  • 10 build in commands
  • hardware handshake can be activated
  • 4 free ports on the AVR

First the circuit diagram:

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