Making noises?

[killerwhat]

Hello. Can a crumble output be used to make a sound along with a piezo sounder?

[Joseph]

Hi,

The Crumble can’t drive a piezo ‘musically’, but if you just need a buzz, there are a couple of ways to do it.

The first would involve writing a loop to toggle an output between HI and LO (without any delays). This should produce an audible tone, although it might be a little quiet.

The second way involves connecting the piezo to a motor output and setting the motor to 50% power. Because the motors are PWMed (Pulse Width Modulated), you should hear a 1kHz tone.

Hope this helps,

Joseph

[Mike]

I’ve had success by ripping the ‘speaker’ out of a pair of old headphones, connecting it to C and Ground, and running the attached code to generate tones. I haven’t managed to get it to run any faster, so this is the smallest step-between-tones I can achieve.

Note that if you run it disconnected, powered by battery, the tones get higher and smoother. I think because the crumble is not polling the computer while it runs?

Also see attached a ‘squeak’ sound! 🙂

Attachments:

1. 

   crumblesound.png
   

2. 

   crumblesound-squeak.png
   

[Author]

Posts