BUZZ 2 click

BUZZ 2 click carries the CMT-8540S-SMT magnetic buzzer transducer. The buzzer’s resonant frequency is 4kHz. The click is designed to run on either 3.3V or 5V power supply.

How the click works

The CMT-8540S-SMT magnetic buzzer is controlled by the PWM pin on the mikroBUS™ line.

You can create different sound patterns using the Sound library supported in our compilers, or utilize the microcontroller internal PWM module to create the signal for the buzzer. Signal frequency determines the sound pitch, and the duty cycle determines the amplitude (sound volume).

Power supply selection

Onboard VCCIO SEL zero-ohm resistor (SMD jumper) is used to determine whether 5V or 3.3V power supply is used. This resistor is placed in 5V position by default.

Specifications

Pinout diagram

This table shows how the pinout on BUZZ 2 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	PWM	PWM input
	NC	2	RST	INT	15	NC
	NC	3	CS	TX	14	NC
	NC	4	SCK	RX	13	NC
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power supply	+3.3V	7	3.3V	5V	10	+5V	Power supply
Ground	GND	8	GND	GND	9	GND	Ground

Programming

Code examples for BUZZ 2 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet defines the notes and initializes the Sound library.

01 // notes
02 #define cS  261
03 #define dS  294
04 #define e   329
05 #define fS  349
06 #define g   391
07 #define gS  415
08 #define aHa 440
09 #define aS  455
10 #define b   466
11 #define cH  523
12 #define cSH 554
13 #define dH  587
14 #define dSH 622
15 #define eH  659
16 #define fH  698
17 #define fSH 740
18 #define gH  784
19 #define gSH 830
20 #define aH  880
21 void systemInit()
22 {
23     AD1PCFG = 0xFFFF;   
24     TRISD = 0;  
25 }
26 void Buzz_2_Init()
27 { 
28     Sound_Init(&LATD, 0);   
29 }
30 void Buzz_2_Task()
31 {
32     Sound_Play(aHa, 500);
33     Sound_Play(aHa, 500);    
34     Sound_Play(aHa, 500);
35     Sound_Play(fS, 350);
36     Sound_Play(cH, 150);  
37     Sound_Play(aHa, 500);
38     Sound_Play(fS, 350);
39     Sound_Play(cH, 150);
40     Sound_Play(aHa, 650);
41     delay_ms(500);
42     Sound_Play(eH, 500);
43     Sound_Play(eH, 500);
44     Sound_Play(eH, 500);  
45     Sound_Play(fH, 350);
46     Sound_Play(cH, 150);
47     Sound_Play(gS, 500);
48     Sound_Play(fS, 350);
49     Sound_Play(cH, 150);
50     Sound_Play(aHa, 650);
51 }
52 void main()
53 {
54     systemInit();
55     Buzz_2_Init();
56     while( 1 )
57     {
58         Buzz_2_Task();
59     }
60 }

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