Otopus

Interferometro acustico

MUX esterno

si puo fare un mux 32:8 con 4 SP4T duali, comandati dai piedini MUX

• ts3a5017 http://www.ti.com/product/ts3a5017 14-Ohm Dual SP4T Analog Switch 3.3-V/2.5-V Analog Multiplexer/Demultiplexer

Filtro passa banda

Minima distorsione di fase possibile.

• http://www.ti.com/sc/docs/apps/msp/journal/nov2000/nov_08.pdf An audio circuit collection, Part 1
• http://www.ti.com/lit/an/sloa096/sloa096.pdf More Filter Design on a Budget

uC

http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en532298 dsPIC33FJ128GP802, 2 ADC 12 bit https://www.microchip.com/wwwproducts/Devices.aspx?product=dsPIC33EP16GS502 dsPIC33EP16GS502, 5 ADC 12 bit

Mappa pin

Pin	Funzione	Nome	porta sul uC
1	MCLR		MCLR
2	CH0		AN0/VREF+/CN2/RA0
3	CH1		AN1/VREF-/CN3/RA1
4	Dati ICSP/CH2		PGED1/AN2/C2IN-/RP0(1)/CN4/RB0
5	Clock ICSP/CH3		PGEC1/ AN3/C2IN+/RP1(1)/CN5/RB1
6	CH4		AN4/C1IN-/RP2/CN6/RB2
7	CH5		AN5/C1IN+/RP3/CN7/RB3
8	V -		VSS
9	MUX_0		OSC1/CLKI/CN30/RA2
10	MUX_1		OSC2/CLKO/CN29/PMA0/RA3
11			SOSCI/RP4(1)/CN1/PMBE/RB4
12			SOSCO/T1CK/CN0/PMA1/RA4
13	V +		VDD
14	U1RX registro RPINR18		PGED3/ASDA1/RP5 /CN27/PMD7/RB5
15	U1TX RP 00011		PGEC3/ASCL1/RP6(1)/CN24/PMD6/RB6
16			INT0/RP7(1)/CN23/PMD5/RB7
17			TCK/SCL1/RP8(1)/CN22/PMD4/RB8
18			TDO/SDA1/RP9(1)/CN21/PMD3/RB9
19	V -		VSS
20	10 uF tantalio verso VSS		VCAP
21			PGED2/TDI/RP10(1)/CN16/PMD2/RB10
22			PGEC2/TMS/RP11(1)/CN15/PMD1/RB11
23	DAC left +		AN12/DAC1RP/RP12(1)/CN14/PMD0/RB12
24	DAC left -		AN11/DAC1RN/RP13(1)/CN13/PMRD/RB13
25	CH7		AN10/DAC1LP/RTCC/RP14(1)/CN12/PMWR/RB14
26	CH6		AN9/DAC1LN/RP15(1)/CN11/PMCS1/RB15
27	V - analogico		AVSS
28	V + analogico		AVDD

grandezze

grandezza	valore	unita'
velocita del suono	343	m/s
lambda di 1khz	343	mm
lambda di un periodo a 24ksps	14	mm
1 m/suono	2.91	msec
campioni per 1/msuono	67	campioni

http://web.njit.edu/~gary/728/Lecture8.html