Hi !

I'm using a PIC12F629 with internal oscilator (4Mhz) a LM386 as amplifier, and a piezo to emmit ultrasound wave (from 28Khz to 60Khz).
All I can achieve is an annoying sound but no ultrasound at all.

I'm actually using the suroutine below, obtained from Melanie in this forum:

MakeSound:
For CounterA=1 to 1000
High gpio.0
PauseUS 10
Low gpio.0
PauseUS 10
Next CounterA
Return

Can anyone help me?

Tks in advance.