Difference between revisions of "Matrix - Buzzer"
From FriendlyELEC WiKi
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::Please connect Pin S to GPIO PIN1, V to 5V and G grounded | ::Please connect Pin S to GPIO PIN1, V to 5V and G grounded | ||
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::TODO | ::TODO | ||
Revision as of 07:07, 11 August 2015
Contents
1 Introduction
We utilize a 5V passive buzzer. To drive this buzzer an oscillating source is needed. Pin V is power, Pin G is grounded and Pin S is PMW signal input. Pin S is connected to a triode to turn on/off the buzzer. A PWM signal can be either 3.3V or 5V and the buzzer's sound will vary accordingly.
2 Features
- 5V Power Supply
- 3.3V/5V PWM
- Tiny, easy to be used in various situations
- 2.54mm spacing pin
3 How To
3.1 Connection
- Connect to Tiny4412 SDK (1506)
- Firstly you need to remove the jumper on BP1_EN on the Tiny4412 SDK 1506 carrier board
- Please connect Pin S to GPIO PIN1, V to 5V and G grounded
- Connect to NanoPi
- TODO
3.2 Code Sample in C Under Linux
#include <stdio.h> #include <unistd.h> #include <stdlib.h> #include "libfahw.h" int parseCmd(int argc, char **argv, int *pin, int *Hz, int *duty) { int num = atoi(argv[1]); int hz = atoi(argv[2]); int dt = atoi(argv[3]); if (hz<0) { return -1; } if (dt<0 || dt>1000) { return -1; } switch(num) { case 0: *pin = TINY4412_PWM0; break; case 1: *pin = TINY4412_PWM1; break; default: printf("Unsupported pin TINY4412_PWM%d\n", num); num = 0; *pin = TINY4412_PWM0; } *Hz = hz; *duty = dt; printf("Using config: pin=PWM%d freq=%dHz duty=%d\n", num, hz, dt); return 0; } int main(int argc, char ** argv) { int pin = TINY4412_PWM0; int Hz; int duty; if (argc == 4) { if (parseCmd(argc, argv, &pin, &Hz, &duty) == -1) { return -1; } } else { Hz = 1000; duty = 500; printf("Usage:%s PWM[0~1] freq duty[0~1000]\n", argv[0]); printf("Using default config: pin=PWM0 freq=%dHz duty=%d\n", Hz, duty); } if (PWMPlay(pin, Hz, duty) == -1) { printf("Fail to output PWM\n"); } printf("Press enter to stop PWM\n"); getchar(); PWMStop(pin); printf("Stopped PWM\n"); return 0; }
3.3 Compile and Run
git clone http://github.com/friendlyarm/fa-hardware.git cd fa-hardware cd demo cd matrix-buzzer make
Copy your compiled bin to your board and you are ready to go.
