How to make that "noise" sshhh sound lorries and emergengy vehicles make without a mp3 player.
I want to make others aware of me on a bicycle other than a bell becuse they would use a bell if better. noise is omni-directional
It's turning a port on off through an amp. I looked for the sound to sample. It's late. Any thoughts other than mp3 player?
more a squelch sound https://www.youtube.com/watch?v=fa28lIGuxq8
If I can find the sound then use audacity and how much mem needed and how. Not random port on off which works sort of. Daft idea. Ride a bike.
Last edit: stan cartwright 2018-02-27
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
;
; Pseudorandom digital white noise generator for PIC series.
;
; PIC12C508 version written April 7th, 1997 by Scott Rider.
; Questions/comment to chip@aeug.org
;
; This program uses Microchip assembler mnemonics and the Microchip
; MPASM assembler (http://www.microchip.com/). Default config options
; are set in the __FUSES line below: MCLRE off, CP off, WDT off, OSC=INTRC.
;
; _______ _______
; | \/ |
; (+5V) Vdd --+ 1 8 +-- Vss (GND)
; | | 470
; X1/CLKI/GP5 --+ 2 7 +-- GP0 (audio out) --/\/\/-- (spkr)
; (not used) | | | 10K 1uF
; X2/CLKO/GP4 --+ 3 6 +-- GP1 --/\/\/--|(-- (line)
; (not used) | | (not used)
; GP3/!MCLR --+ 4 5 +-- GP2
; (not used) | (PIC12C508) | (not used)
; +----------------+
;
; This program generates a continuous stream of white noise through a
; speaker connected (via a 470-ohm series resistor) to pin GP0 of a
; PIC12C508. It demonstrates an easy method for generating a seemingly
; random stream of bits. Hardware folks will probably recognize it as the
; tapped shift register technique covered in the CMOS Cookbook by Don
; Lancaster.
;
; Adapted from the original PIC16C54 (Parallax) version by Scott Edwards.
;
list p=12c508
radix dec
include "p12c508.inc"
__FUSES _MCLRE_OFF &_CP_OFF & _WDT_OFF & 0xFFE ;Internal osc.
cblock 0x07 ;Variables
i ;Loop counter
x ;Scratch
y ;Scratch
sr0 ;32 bits of shift register
sr1
sr2
sr3 ;/
endc
org 0x0
;
; PIC12C508 cold starts at 0XFFF (where it loads a factory-programmed
; internal osc. calibrate value). It then rolls over to 0x0.
;
movwf OSCCAL
goto start
;
; Subroutines in 12-bit PIC series must go on bottom page of ROM.
;
wait movlw 35 ;Change this number for different sound if using
movwf i ;'wait' rotuine (normally disabled).
loop decfsz i,F
goto loop
retlw 0
;
; Main code area traditionally starts at 0x100 on a 12-bit PIC.
;
org 0x100
start movlw b'11000000' ;Turn off T0CKI
option ;/
movlw b'00000000' ;Preset outputs to come up low
movwf GPIO ;/
movlw b'00000000' ;Set the I/O direction (all bits output)
tris GPIO
clrf sr0 ;Might as well start with a seed of 1.6E7.
clrf sr1
clrf sr2
clrf sr3
incf sr3,F ;/
;
; The main loop 'taps' is 24 CPU cycles. At the 4MHz internal clock
; rate, the noise output is operating at a max. rate of about 21KHz.
;
taps btfss sr3,6 ;Get bits 18 and 31 for the feedback XOR.
bcf x,0
btfsc sr3,6
bsf x,0 ;Bit 31 -> x
btfss sr2,1
bcf y,0
btfsc sr2,1
bsf y,0 ;Bit 18 -> y
movf y,W ;!(x XOR y) -> carry
xorwf x,F
btfsc x,0
bcf STATUS,C
btfss x,0
bsf STATUS,C ;/
rlf sr0,F ;32-bit shift
rlf sr1,F
rlf sr2,F
rlf sr3,F ;/
;
; Put a pseudorandom bit out to the speaker. In this example, GPIO bit 0
; (pin 7 on the PIC12C508) is used. Be sure to use a 470 ohm resistor for
; speaker or 10K or better for input to an op-amp/divider/whatever.
;
; Also, to use all six GP bits for noise, just comment the following 4
; lines and uncomment the 5th and 6th lines.
;
btfss sr3,7 ;line 1
bcf GPIO,0 ;line 2
btfsc sr3,7 ;line 3
bsf GPIO,0 ;line 4
; movf sr3,W ;line 5
; movwf GPIO ;line 6
;
; Uncomment the following 'call wait' to experiment with changing the
; 'texture' of the noise (see 'wait' routine, above).
;
; call wait ;Optional delay routine to alter sound
goto taps ;Ad infinitum...
;
; That's all, folks!
;
end
Not my code but Scott Rider is well respected in the PIC Community and I trust his work.
Cheers
Chris
Edit: Updated SF is doing strange things in the text field now.
This took several edits to fix all the new idiosyncrasies so watch out if you post formatted text.
Last edit: Chris Roper 2018-03-12
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
How to make that "noise" sshhh sound lorries and emergengy vehicles make without a mp3 player.
I want to make others aware of me on a bicycle other than a bell becuse they would use a bell if better. noise is omni-directional
It's turning a port on off through an amp. I looked for the sound to sample. It's late. Any thoughts other than mp3 player?
more a squelch sound https://www.youtube.com/watch?v=fa28lIGuxq8
If I can find the sound then use audacity and how much mem needed and how. Not random port on off which works sort of. Daft idea. Ride a bike.
Last edit: stan cartwright 2018-02-27
This should point you in the right direction:
; ; Pseudorandom digital white noise generator for PIC series. ; ; PIC12C508 version written April 7th, 1997 by Scott Rider. ; Questions/comment to chip@aeug.org ; ; This program uses Microchip assembler mnemonics and the Microchip ; MPASM assembler (http://www.microchip.com/). Default config options ; are set in the __FUSES line below: MCLRE off, CP off, WDT off, OSC=INTRC. ; ; _______ _______ ; | \/ | ; (+5V) Vdd --+ 1 8 +-- Vss (GND) ; | | 470 ; X1/CLKI/GP5 --+ 2 7 +-- GP0 (audio out) --/\/\/-- (spkr) ; (not used) | | | 10K 1uF ; X2/CLKO/GP4 --+ 3 6 +-- GP1 --/\/\/--|(-- (line) ; (not used) | | (not used) ; GP3/!MCLR --+ 4 5 +-- GP2 ; (not used) | (PIC12C508) | (not used) ; +----------------+ ; ; This program generates a continuous stream of white noise through a ; speaker connected (via a 470-ohm series resistor) to pin GP0 of a ; PIC12C508. It demonstrates an easy method for generating a seemingly ; random stream of bits. Hardware folks will probably recognize it as the ; tapped shift register technique covered in the CMOS Cookbook by Don ; Lancaster. ; ; Adapted from the original PIC16C54 (Parallax) version by Scott Edwards. ; list p=12c508 radix dec include "p12c508.inc" __FUSES _MCLRE_OFF &_CP_OFF & _WDT_OFF & 0xFFE ;Internal osc. cblock 0x07 ;Variables i ;Loop counter x ;Scratch y ;Scratch sr0 ;32 bits of shift register sr1 sr2 sr3 ;/ endc org 0x0 ; ; PIC12C508 cold starts at 0XFFF (where it loads a factory-programmed ; internal osc. calibrate value). It then rolls over to 0x0. ; movwf OSCCAL goto start ; ; Subroutines in 12-bit PIC series must go on bottom page of ROM. ; wait movlw 35 ;Change this number for different sound if using movwf i ;'wait' rotuine (normally disabled). loop decfsz i,F goto loop retlw 0 ; ; Main code area traditionally starts at 0x100 on a 12-bit PIC. ; org 0x100 start movlw b'11000000' ;Turn off T0CKI option ;/ movlw b'00000000' ;Preset outputs to come up low movwf GPIO ;/ movlw b'00000000' ;Set the I/O direction (all bits output) tris GPIO clrf sr0 ;Might as well start with a seed of 1.6E7. clrf sr1 clrf sr2 clrf sr3 incf sr3,F ;/ ; ; The main loop 'taps' is 24 CPU cycles. At the 4MHz internal clock ; rate, the noise output is operating at a max. rate of about 21KHz. ; taps btfss sr3,6 ;Get bits 18 and 31 for the feedback XOR. bcf x,0 btfsc sr3,6 bsf x,0 ;Bit 31 -> x btfss sr2,1 bcf y,0 btfsc sr2,1 bsf y,0 ;Bit 18 -> y movf y,W ;!(x XOR y) -> carry xorwf x,F btfsc x,0 bcf STATUS,C btfss x,0 bsf STATUS,C ;/ rlf sr0,F ;32-bit shift rlf sr1,F rlf sr2,F rlf sr3,F ;/ ; ; Put a pseudorandom bit out to the speaker. In this example, GPIO bit 0 ; (pin 7 on the PIC12C508) is used. Be sure to use a 470 ohm resistor for ; speaker or 10K or better for input to an op-amp/divider/whatever. ; ; Also, to use all six GP bits for noise, just comment the following 4 ; lines and uncomment the 5th and 6th lines. ; btfss sr3,7 ;line 1 bcf GPIO,0 ;line 2 btfsc sr3,7 ;line 3 bsf GPIO,0 ;line 4 ; movf sr3,W ;line 5 ; movwf GPIO ;line 6 ; ; Uncomment the following 'call wait' to experiment with changing the ; 'texture' of the noise (see 'wait' routine, above). ; ; call wait ;Optional delay routine to alter sound goto taps ;Ad infinitum... ; ; That's all, folks! ; endNot my code but Scott Rider is well respected in the PIC Community and I trust his work.
Cheers
Chris
Edit: Updated SF is doing strange things in the text field now.
This took several edits to fix all the new idiosyncrasies so watch out if you post formatted text.
Last edit: Chris Roper 2018-03-12
Cool. I was thinking of if random>127 then port on else port off.
Seems they make them. https://www.google.co.uk/search?q=white+noise+bicycle+horn&tbm=isch&source=iu&ictx=1&fir=xYNWqFZXeUW9OM%253A%252CV3TKp95lUX8TyM%252C_&usg=__IpCi1s_N_3Dtkw_G7g1Z7ucBT58%3D&sa=X&ved=0ahUKEwjTnaWjlsbZAhWR_aQKHZ2rAyEQ9QEIxAEwDQ#imgrc=xYNWqFZXeUW9OM:
Can't you just get a turbospoke? http://www.turbospoke.com/ :)
Or a piece of plastic taped to the frame and interfering with the spokes.
Worked for me 50 years ago, everyone could hear me coming :)