Adding LCD for BPM

[fistycuffs]

Hi

sorry if this is a daft question but not been able to track anything down.

just wondering if its possible to add an LCD screen to the X0XB0X that is connected to the tempo control so you can see an actual BPM value?

[antto]

surely it will at least require firmware modification

[guest]

there arent any free pins on the micro
but it might be possible to multiplex the spi line

otherwise it would probably be easier to add another small micro
or use a 74c925 on the dinsync clock line
it has the display multiplexer and divide by 60 counter built in
but its meant to work with an led display

[fistycuffs]

That's great, cheers guys.

I'll have a look into the 74c925 option - although as a total novice, sounds like it might be best to settle with the tap tempo function

[SubStyler]

there arent any free pins on the micro
but it might be possible to multiplex the spi line

otherwise it would probably be easier to add another small micro
or use a 74c925 on the dinsync clock line
it has the display multiplexer and divide by 60 counter built in
but its meant to work with an led display

I have a few 74C925 ICs lying around.
could this be a good circuit for a BPM-meter with 7-segment LEDs? (circuit design is from Fairchild as far as I know)

4-digit-counter.jpg (111.49 KiB) Viewed 1982 times

[guest]

they make great bpm counters
thats the first thing i made with one

i have no idea what the phototransistor is doing
in that schematic though
perhaps the things its counting is light pulses

im pretty sure they make others ones
with different divide by n values
so you can have different time standards

[teknosis]

could this mod for the 303 not be reworked to work in x0x? has a really nice big screen

http://ultra303.de/

[guest]

it would probably be easier to mod the current x0x firmware
than to mod another microcontroller that might not have
the pins in the right place to work with the x0x

the x0x uses a lot of cpu pins
and has 2 uarts

[antto]

imo, a 20x4 lcd is better