On Mon, 13 Mar 2000, Micah Dowty wrote:
> On Mon, 13 Mar 2000, Freeman,DI,David,NZD3 R wrote:
> > HI,
> > I very much like the look of this device.
so do I!
> > 3. How have you made the keyboard?
> No, the one in the prototype is a surplus Dauphin keyboard from
> www.all-electronics.com, the LCD was also purchased surplus from there.
> The LCD works ok, but the fact that it requires +/- 5v is annoying.
> Anybody know of better places to get a keyboard and LCD?
Another suggestion: use a charge pump to generate the +/- 5v. You
probably have a Maxim MAX232 for your serial connection anyway, right?
It has *two* buffers - use one for serial, the other for the LCD.
max232 info (there's bunches of other chips, that just the one
I've heard of most often.)
sells the MAX232 with the required four caps for $2US
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