Boe-Bot police siren

Joelectro66

Hi everybody,

I would like to make the piezo speaker sound like a police.

Please answer my question.

Thanks

Joelectro66

Genetix

The 2nd program might be what you are looking for.
http://www.dummies.com/how-to/content/electronics-projects-how-to-create-sound-effects.html

The SoundPAL has American-Style Siren as one of the Canned Sound Sequences, accessed by the Play command.
https://www.parallax.com/product/28825

Joelectro66

Hi,

Thanks for helping me, in first site, I tried the 2 codes but it didn't worked.
The SoundPal is a good product, but I don't want to buy something.
I just want to program the piezo speaker.

Thanks again

Joeletro66

Publison

BTW. Welcome to the forums!

The first program in post# 2 should work:

' {$STAMP BS2}
' {$PBASIC 2.5}


' Siren Effect Program
' Doug Lowe
' July 15, 2011
'
' This program generates a rising and falling pitch similar to a police siren.
' The rate at which the pitch rises and falls changes if you press either
' of the two pushbuttons.

Speaker  PIN 0
Switch1  PIN 10
Switch2  PIN 14
Frequency VAR Word
Time   VAR Word
DO
 FOR Frequency = 3000 TO 5000 STEP 15
  GOSUB SetTime
  FREQOUT 0, Time, Frequency
 NEXT
 FOR Frequency = 5000 TO 3000 STEP 15
  GOSUB SetTime
  FREQOUT 0, Time, Frequency
 NEXT
LOOP
SetTime:
 Time = 15
 IF Switch1 = 1 THEN
  Time = 5
 ENDIF
 IF Switch2 = 1 THEN
  Time = 2
 ENDIF
 RETURN

You will need the two switches.

Do you have a photo of your setup? That would help alot.