6 Dec
2007
6 Dec
'07
1:05 p.m.
On 5 Dec 2007 at 16:35, Mr Ian Primus wrote:
Or a normal rotary switch and a bunch of pull up/down resistors (I don't
know if the enable lines are to be active high or active low)? Even more
direct. For that matter, what about a bank of mechancially-interlocked
buttons (I think you can still get such swtiches and the bracketry to
interlock them).
-tony
The main thing I'm trying to achieve is
simplicity.
Nothing fancy. No PIC's, no microcontrollers, etc. I
initially thought of using flip flops and a bunch of
inverters to reset all the non-selected flip flop, but
couldn't work out in my head a good way to do it... I
hadn't taken switch debouncing into the equation - but
aren't flip flops commonly used to debounce switches
anyway?
...or a 0-7 BCD switch connected to a demux chip? Small, direct
readout.