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Metronome with 4 leds? Answered

How hard would it be to make a metronome with 4 leds. I don't care about speakers.
There are projects like that in instructables and youtube but they're all 2 leds and a speaker.
They go 1-2-1-2-1-2-1-2-1-2
I want it to go 1-2-3-4-1-2-3-4-1-2-3-4
it would be pretty cool with different color leds.
What would it require, probably similar materials to the instructables, but less cause there is no speaker.
How would the circuit look like?

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user
iceng (author)2011-05-06

Here is a circuit I modified for your question.
To change speed raise the value of the 2.2 K
or lower the value of 47K

And to count 1-2-3-1-2-3-1-2-3
disconnect 9 wire free
disconnect 7 resistor free
add wire 15 to pin 7

A

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green_emi (author)iceng2011-09-27

Thank you!
This will make a great beginner's project for me.
Can I use a pot to change the speed of the metronome? where would i put it?
And could you add to the schematic or explain the 32K crystal / divider?
I'd appreciate it, thanks,
Emi

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iceng (author)green_emi2011-09-27

If you put a 50K pot in series with the 2.2K resistor,
you don't want the xtal divider which replaces the 555.

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steveastrouk (author)iceng2011-05-07

I think I'd put a 32K crystal and divider on the front perhaps ?

Steve

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iceng (author)steveastrouk2011-05-09

+1 you are correct Steve,
no one wants a changing rhythm with room temperature.

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steveastrouk (author)iceng2011-05-09

A.

Do YOU remember an "ST" (SGS ?) part that divided a 1M crystal down to 50 or 60Hz, all in one package ? I used it on a job once, I'd like to use it again, but I can't find it....

Steve

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iceng (author)steveastrouk2011-05-09

I used the 8650A 16pin dip with 60KC quartz and 57 programmable frequencies made by Epson ( still available ).
(SGS ) reminds me of my very first processor 2650 made by Signetics
took six months ( slow learner :) to understand two demo programs. Alex

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verence (author)iceng2011-05-07

What, no Arduino? Not even a PIC or AVR? Are you kidding? (No, I am ;-) )

Well yeah, the good old CMOS logic stuff. Works without programmin, right out of the box.

+1

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