Boe-Bot police siren

Comments

• Genetix Posts: 1,763

  2015-03-20 16:45 edited 2015-03-20 16:45

  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 Posts: 4

  2015-04-03 07:15 edited 2015-04-03 07:15

  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 Posts: 12,366

  2015-04-03 07:36 edited 2015-04-03 07:36

  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.