I am working on my code for the device similar to yours now, I will post in the blog section in the next few days. It will use RS232 and/or an infra-red remote for data input this way it will need no keys (holes) and can be made waterproof more easily. I will use a mega644p or 1284p these have two RS232 serial ports (also have them at hand and cost is low) one I will use for control using transparent wireless UHF modules the other will be for wireless devices, remote sensors ect I am pulling code from my other projects at present building up the basic functions clock, infra-red remote, RS232 command prompt and real time clock communication.
Regards Paul
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