On Tue, Mar 11, 2008 at 08:53:38PM +1030, Daniel O'Connor wrote: > > > > - Wire each 7 segment display to a digital 8 bit latch. > > - Use one data port to send your seven bits of segment data to all > > three seven segments via a bus
[...] > I don't think that will work with this because it's 3 7 segment > displays ganged in parallel. > > The latch idea would work for 3 separate 7 seg displays, however it's > probably more sensible to refresh each one frequently (fewer parts > needed). > > If the OP has something like this.. > http://pdf1.alldatasheet.com/datasheet-pdf/view/168057/ETC/LDT-M514RI.html > (although common cathode instead) > > Then they will need to update each separate display often enough so > the user doesn't see any flicker (50Hz+). Driving the LED with a latch doesn't flicker, even if its updated once every 5 minutes. All segments which are illuminated are driven by an output bit on the latch. When one is operating with a limited power budget and for some reason must drive LED display not LCD then one can save power by multiplexing where only one segment of the display array is driven at a time, driven hard and fast moving on to the next before the eye notices. This is common with LED calculators and watches. -- David Kelly N4HHE, [EMAIL PROTECTED] ======================================================================== Whom computers would destroy, they must first drive mad. _______________________________________________ AVR-chat mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/avr-chat
