Change counter increment

[gregw]

I'm using a 3 digit lcd counter kit to measure small amounts of water with a water meter that provides switch reed closures. The water meter produces a close every 1/2 liter so the display is double the amount in litres.

Can someone please advise me how to modify this circuit to either divide the input counts by 2 (to display in litres) or multiply them by five (to display in .5 litre increments)?

Thanks.

 

[on1aag]

Hi Greg,

Multiplying by five is easier said than done but dividing by
two is easy.
You need to insert a flip-flop between the output of IC1d
and the clock input of the counter (IC2).
You can use one half of a CD4027 or a CD4013, both are
dual flip-flops.

on1aag.