Project 10: Modification

[charlest]

Hi, thanks for making this kit available.

I've just completed Project 10: Detecting Vibration & Knocks.

I was wondering whether it would be possible to include the availability to make sounds together with detecting knocks? FYI, the piezo module is already connected to analogue input pin A0.

[angusgr]

Yes, you can do this you just can't do both at the same time.

So to switch the piezo on pin A0 to an output and play a 440Hz tone:

Code: Select all

pinMode(A0, OUTPUT);
tone(A0, 440);

Then when you're done and want to take an analog reading, you stop the tone and then take your input reading:

Code: Select all

noTone(A0);
pinMode(A0, INPUT);
knock = analogRead(0);

(Note that you'll need something in between these two code snippets in order for the Eleven to pause and actually allow some time to play the tone. 'delay(1000);' will pause it for a second.

- Angus

[charlest]

Thanks for your help. I'll give it a go.