USB stick
USB stick made from polymorph playing sound and blinking (sorry for bad image quality).
Here's the schema and code i found on the interwebs but can't remember on what site. The circuit is based on the Atmel ATtiny13 µC with sound output on pb0 in series with a simple RC filter.
You'll need an avr assembler for this to compile (AVR Studio).
;--------------------------------------------------------
; File: Sinewave.asm
; December 21 2006
; Wagner Lipnharski (wagner@ustr.net)
; processor Atmel AVR AtTiny13
;
; Description: Example of how to use the fast PWM of the
; ATtiny13 to generate "sine-wave" signal.
;
; The PWM output requires filtering to shape
; the sine wave form. The filter may be composed
; by a simply 10k resistor connected to the PB1 pin
; to a 100nF capacitor to ground. This output may
; be boosted by an operational amplifier.
;
;---------------------------------------------------------
;
; You must program AtTiny13 Fuse:
; Internal RC Oscillator 9.6MHz Start-Up time: 14CK + 64ms
;
;---------------------------------------------------------
.include "tn13def.inc"
.Def Temp1 = R15
.Def Temp = R16
.Def Temp2 = R17
.Def TablePtr = R18
.Def Tone1 = R19
.Def Tone1Temp = R20
.Def Tempo = R21
.Def SineCntr = R22
.Def SineCntrTmp = R23
.Def Skipper = R24
.Def KeyNumber = R25 ; Key A5=0, Key B7=15
.Def PlayerL = R26
.Def PlayerH = R27
;Initialization
.cseg
.org $000
Rjmp Init
;***********************************************
; MUSIC TO PLAY - Change this Table
;***********************************************
; [Zero, KeyNumber, Tempo, Pause]
; KeyNumber 0-15
; Tempo 1-50 (aprox 200ms each)
; Pause 1-50 (aprox 5ms each)
; End table with 255,255,255,255
Music:
.db 0,1,1,1
.db 0,6,1,2
.db 0,3,1,1
.db 0,9,1,2
.db 0,2,1,1
.db 0,2,1,2
.db 0,12,1,1
.db 0,15,1,2
.db 0,7,1,1
.db 0,10,1,2
.db 0,13,1,1
.db 0,13,1,2
.db 0,3,1,1
.db 0,3,1,2
.db 0,3,1,1
.db 0,3,1,1
.db 0,3,1,2
.db 0,3,1,1
.db 0,13,1,2
.db 0,13,1,1
.db 0,10,1,2
.db 0,7,1,1
.db 0,15,1,2
.db 0,12,1,1
.db 0,2,1,2
.db 0,2,1,1
.db 0,9,1,2
.db 0,3,1,1
.db 0,6,1,2
.db 0,1,1,1
/*
; We wish you a Merry Christmas
.db 0,6,4,3
.db 0,9,4,4
.db 0,9,2,3
.db 0,10,2,3
.db 0,9,2,3
.db 0,8,2,3
.db 0,7,4,3
.db 0,7,2,15
.db 0,7,4,3
.db 0,10,4,4
.db 0,10,2,3
.db 0,11,2,3
.db 0,10,2,3
.db 0,9,2,3
.db 0,8,4,3
.db 0,6,2,15
.db 0,6,4,3
.db 0,11,4,4
.db 0,11,2,3
.db 0,12,2,3
.db 0,11,2,3
.db 0,10,2,3
.db 0,9,4,3
.db 0,7,2,15
.db 0,6,2,3
.db 0,6,2,3
.db 0,7,4,3
.db 0,10,4,3
.db 0,8,4,3
.db 0,9,8,80
; NOEL First Part
.db 0,4,2,3 ; Key=4, Tempo=2, Pause=3
.db 0,3,2,3 ; Key=3, Tempo=2, Pause=3
.db 0,2,6,3
.db 0,3,2,3
.db 0,4,2,3
.db 0,5,2,3
.db 0,6,6,15
.db 0,7,2,3
.db 0,8,2,3
.db 0,9,4,3
.db 0,8,4,3
.db 0,7,4,3
.db 0,6,6,30
.db 0,9,4,3
.db 0,8,4,3
.db 0,7,4,3
.db 0,6,4,3
.db 0,7,4,3
.db 0,8,4,3
.db 0,9,4,3
.db 0,6,4,3
.db 0,5,4,3
.db 0,4,4,30
; NOEL Second Part
.db 0,4,2,3
.db 0,3,2,3
.db 0,2,6,3
.db 0,3,2,3
.db 0,4,2,3
.db 0,5,2,3
.db 0,6,6,15
.db 0,9,2,3
.db 0,8,2,3
.db 0,9,4,3
.db 0,8,4,3
.db 0,7,4,3
.db 0,6,6,30
.db 0,9,4,3
.db 0,8,4,3
.db 0,7,4,3
.db 0,6,4,3
.db 0,7,4,15
.db 0,8,2,3
.db 0,9,4,3
.db 0,6,4,3
.db 0,5,4,3
.db 0,4,4,80
*/
.db 255,255,255,255 ; <=== End of Music to Play
;***********************************************
; INITIALIZATION
;***********************************************
INIT:
; Set PB0 and PB1 as output
Ldi Temp, (1<<PB0) | (1<<PB1)
Out DDRB, Temp
; Set PWM Mode
; Togle OC0A on Compare
Ldi Temp, (1<<COM0A1) |(1<<WGM00) |(1<<WGM01)
Out TCCR0A, Temp
; Set PWM Clock equal to Internal Clock
Ldi Temp, (1<<CS00)
Out TCCR0B, Temp
Clr TablePtr
Clr r18
;***********************************************
; WILL READ "MUSIC TO PLAY" AND PLAY IT
;***********************************************
MusicLoop:
Ldi PlayerH,High(Music*2)
Ldi PlayerL,Low(Music*2)
MusicLoop1:
Mov ZL,PlayerL
Mov ZH,PlayerH
Clr Temp
Adiw ZL,1
Lpm
Mov KeyNumber,R0
Cpi KeyNumber,255
Breq MusicLoop
Adiw ZL,1
Lpm
Mov Tempo,R0
Adiw ZL,1
Lpm
Mov Temp2,R0
Push Temp2
Adiw ZL,1
Mov PlayerL,ZL
Mov PlayerH,ZH
Rcall Get_Tone
Pop Temp2
Rcall Delay1
Rjmp MusicLoop1
;***********************************************
; FIND PIANO KEY PROPERTIES (Frequency, etc)
;***********************************************
Get_Tone: Ldi ZH,High(KeysTable*2)
Ldi ZL,Low(KeysTable*2)
Lsl KeyNumber
Lsl KeyNumber
Inc KeyNumber
Clr Temp
Add ZL,KeyNumber
Adc ZH,Temp
Lpm
Mov Tone1,R0
Adiw ZL,1
Lpm
Mov SineCntr,R0
Adiw ZL,1
Lpm
Mov Skipper,R0
;***********************************************
; CREATE SINEWAVE AND TEMPO IT, According to Key
;***********************************************
Player1: Clr Temp1
Player2: Mov SineCntrTmp,SineCntr
Player3: Mov Tone1Temp,Tone1
Rcall Set_PWM
Dec Tone1Temp
Brne PC-1
Dec Temp1
Brne Player3
Sub SineCntrTmp,Skipper
Brcc Player3
Dec Tempo
Brne Player2
Ret
Delay1: Clr Temp
Dec Temp
Brne Pc-1
Dec Temp1
Brne PC-3
Dec Temp2
Brne Pc-5
Ret
Set_PWM:
Ldi ZH, High(sine_table*2)
Ldi ZL, Low(sine_table*2)
Clr Temp
Add ZL, TablePtr
Adc ZH, Temp
Lpm
Out OCR0A, R0
Add TablePtr,Skipper
Ret
;***********************************************
; PIANO KEY PROPERTIES (Frequency, etc)
;***********************************************
KeysTable:
; 00, Tone, SineCntr, Skipper
.db 00,22,44,1 ; A5
.db 00,44,49,2 ; B5
.db 00,65,53,3 ; C5
.db 00,36,59,2 ; D5
.db 00,88,66,5 ; E5
.db 00,47,70,3 ; F5
.db 00,89,79,6 ; G5
.db 00,107,88,8 ; A6
.db 00,95,99,8 ; B6
.db 00,89,106,8 ; C6
.db 00,79,119,8 ; D6
.db 00,79,132,9 ; E6
.db 00,74,141,9 ; F6
.db 00,73,159,10 ; G6
.db 00,41,176,8 ; A7
.db 00,36,198,8 ; B7
;***********************************************
; SINEWAVE VALUES
;***********************************************
sine_table:
.db 128,131,134,137,140,144,147,150,153,156,159,162,165,168,171,174
.db 177,179,182,185,188,191,193,196,199,201,204,206,209,211,213,216
.db 218,220,222,224,226,228,230,232,234,235,237,239,240,241,243,244
.db 245,246,248,249,250,250,251,252,253,253,254,254,254,254,254,254
.db 254,254,254,254,254,254,254,253,253,252,251,250,250,249,248,246
.db 245,244,243,241,240,239,237,235,234,232,230,228,226,224,222,220
.db 218,216,213,211,209,206,204,201,199,196,193,191,188,185,182,179
.db 177,174,171,168,165,162,159,156,153,150,147,144,140,137,134,131
.db 128,125,122,119,116,112,109,106,103,100,97,94,91,88,85,82
.db 79,77,74,71,68,65,63,60,57,55,52,50,47,45,43,40
.db 38,36,34,32,30,28,26,24,22,21,19,17,16,15,13,12
.db 11,10,8,7,6,6,5,4,3,3,2,2,2,1,1,1
.db 1,1,1,1,2,2,2,3,3,4,5,6,6,7,8,10
.db 11,12,13,15,16,17,19,21,22,24,26,28,30,32,34,36
.db 38,40,43,45,47,50,52,55,57,60,63,65,68,71,74,77
.db 79,82,85,88,91,94,97,100,103,106,109,112,116,119,122,125
; Piano Scale, the first note below, "C", is from the
; the 4th octave, 262Hz (261.6256Hz) and so on.
; The first "A" below, 440Hz is the A5 (fifth octave).
; The numbers nnn/x, means values to be loaded at Tone1
; and Skipper at the Keys on the Key Labels setup.
; The value in (parentesys) below is the aproximately
; frequency the circuit generates based on the setup.
; C4: 262Hz 109/3 (265.4)
; Db4: 277
; D4: 297 99/3 (298)
; Eb4: 311
; E4: 330 89/3 (329.5)
; F4: 349 83/3 (351.5)
; Gb4: 370
; G4: 392 73/3 (396)
; Ab4: 415
; A5: 440Hz 22/1 (440.5)
; Bb5: 466Hz
; B5: 494Hz 44/2 (496) 78/4 (497)
; C5: 523Hz 65/3 (530) 73/4 (528)
; Db5: 554
; D5: 587Hz 46/3 (600) 64/4 (595)
; Eb5: 622
; E5: 659Hz 41/3 (664) 57/4 (664)
; F5: 698Hz 38/3 (708) 53/4 (706) 68/5 (704.4)
; Gb5 740
; G5: 784Hz 33/3 (798) 46/4 (800) 60/5 (789)
; Ab5 831
; A6: 880Hz 29/3 (889) 40/4 (885) 53/5 (882)
; Bb6 932
; B6: 987Hz 26/3 (971) 36/4 (989)
; C6: 1046 23/3 (1071) 32/4 (1065) 47/5 (1061) 53/6(1059) 63/7(1058)
; Db6 1109
; D6: 1174 20/3 (1193) 28/4 (1185) 38/5 (1181)
; Eb6 1245
; E6: 1318 17/3 (1346) 25/4 (1336) 33/5 (1331) 41/6(1327)
; F6: 1396 16/3 (1407)
; Gb6 1480
; G6: 1567 15/3 (1545) 20/4 (1591) 27/5 (1570) 33/6(1597) 40/7(1582)
; Aa6 1661
; A7: 1760
; Bb7 1865 35/7(1774) 41/8(1770)
; B7: 1975 31/7(1963) 36/8(1978)
; C7: 2093 58/13(2116) 53/12(2117) 63/14(2114)
; Dd7 2217
; D7: 2349 7/3(2356) 20/6(2386) 29/8(2371)