As part of the set-up of the new GB3XP repeater to be installed upon St Helier Hospital in Sutton, we’ve been tasked with creating a replacement controller board.
We’ve breadboarded an ATMega328p-pu for initial testing/prototyping for our repeater controller board. We’re using a 16 MHz crystal and capacitors, provided by Martin M1MRB, instead of the internal 8 MHz internal clock (which can drift all over the place sometimes).
As you can see, only the bare minimum components are being used for initial testing and research. These components are as follows:
- The ATMega328p-pu itself (the -pu version is the lower power version used in the Arduino Uno);
- Wires to connect everything up;
- Button wired to reset pin;
- 16 MHz crystal (part of clock oscillator circuit);
- 2 of 22 pF capacitors (part of clock oscillator circuit);
- Green LED connected to (Arduino) pin 13 and;
- A resistor for the LED.
We still need details of the existing controller such as version of the ID O MATIC to better understand how to control using existing connections.
More details to follow.