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Sunrise Word Clock – Circuit Design v1

December 24, 2010 2 comments

Ok, I’ve finally found time to make a new post about my Sunrise Word Clock. My previous attempt at making the circuit work on breadboard didn’t go so well. I assume this is because of the poor connections that the breadboard provides and could also have been because of poor layout choices. Anyway, I’ve rebuilt my prototype on strip board and i’m going to try and explain the circuit here.

The microcontrollers that i have readily available are PIC16F887. These come in a 40 pin DIP package

The interfaces i require are:

  • 2 I2C pins
  • 2 Vdd pins
  • 2 Vss pins
  • 3 programming pins
  • 1 pin for analogue to digital
  • 4 pins for button inputs
  • 6 pins for LCD interface
  • 22 pins for the Front LEDs
  • 1 PWM Power LED Channel
  • 2 Crystal Pins

Total pins required = 45… oh dear

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