If I use some IC which requires clock frequency like 16MHz, can I take one from Arduino?

Or this it too high frequency to travel to neighboring board?

  • 2
    Set the CKOUT fuse to 1, will give you the clock output. And you have to set PORTB0 to an output (pinMode(8,OUTPUT);). You probably don't want to use to long of a trace/wire.
    – Gerben
    Oct 10, 2015 at 16:08
  • The expense of properly sending a clock off-board will be greater than generating a new one over there, so only do it if your signals must be synchronized. Oct 10, 2015 at 17:17
  • Possible duplicate of Arduino constant clock output
    – Nick Gammon
    Oct 10, 2015 at 20:28
  • am dividing arduino clock frequency from 16Mhz to 8Mhz but am getting spike in clock signal how can i reduce that
    – rashmi
    Oct 4, 2017 at 6:18

2 Answers 2


The frequency is important. Make sure they are the same or it will probably not work.


Yes but you need to know what you are doing. You will need a clock driver and possibly a clock receiver depending on the devices you select. Then you need to modify both boards voiding any possible warranty.

The best answer is NO!

  • 5
    I don't agree with that. I don't see any problem with using the arduino clock to clock another chip. The whole point of buying an Arduino is experiment and learn! Screw the warranty. I personally have done it often. Its not that hard.
    – crowie
    Nov 18, 2015 at 12:49
  • 3
    I disagree. Why is it necessary to change the board given Gerben's comment? And I dunno understand, why you are referencing to warranty. Nobody will reasonably try to claim a warranty for a 15€ device where a failure is almost always user generated. If someone over here ever has successfully claimed a warranty for an arduino, let him now speak...
    – Ariser
    Dec 18, 2015 at 12:45
  • 1
    Why not download this application from TI: ti.com/lit/an/scaa082a/scaa082a.pdf Then download: elprocus.com/crystal-oscillator-circuit-and-working after you read them and understand them you will know why I answered as I did. Note this is an open ended question without the necessary specifics to do a proper design. Your solution may work but what happens if yo build thousands of them?
    – Gil
    Mar 4, 2019 at 22:25

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