7 color flash

The module contains a 7-color 5mm LED with a built-in chip that sequentially flashes each color in turn. Color pattern is repeated in about 15 seconds.

• LED model: YB-3120B4PNYG-PM
• Forward voltage: 2.5V - 6V
• Forward current: 40mA

Connection

Pin	Description
"S"	+5V or +3.3V
Central	Ground
"-"	Not connected

Assume LED module is connected to pin D2 of Duinomite board. This corresponds to signal RE2 on pic32 chip.

Control LED from the command line

There are two ways to control GPIO signals from command line: portio utility and text output to /dev/portX device.

First, you need to configure signal RE2 as output:

portio -o e2

Now you can enable (set) the LED:

portio -s e2

To disable (clear) the LED, use:

portio -c e2

/dev/portX and /dev/confX devices

It's possible to control GPIO signals via /dev/portX devices.

Configure signal RE2 as output:

echo -------------o-- > /dev/confe

Now you can enable (set) the LED:

echo -------------1-- > /dev/porte

To disable (clear) the LED, use:

echo -------------0-- > /dev/porte

C program example

This program enables LED for 15 seconds, then disables it for 3 seconds, in a loop.

#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/gpio.h>

#define MASK_D2     (1 << 2)    /* signal RE2 */

int main()
{
    int fd;
    char *devname = "/dev/porta";

    /* Open GPIO driver. */
    fd = open(devname, 1);
    if (fd < 0) {
        perror(devname);
        return -1;
    }

    /* Configure pin as output. */
    ioctl(fd, GPIO_PORTE | GPIO_CONFOUT, MASK_D2);
    ioctl(fd, GPIO_PORTE | GPIO_CLEAR, MASK_D2);

    for (;;) {
        /* Set D2. */
        ioctl(fd, GPIO_PORTE | GPIO_SET, MASK_D2);
        sleep(15);

        /* Clear D2. */
        ioctl(fd, GPIO_PORTE | GPIO_CLEAR, MASK_D2);
        sleep(3);
    }
    return 0;
}

To compile and run this program, use:

# cc led7.c -o led7
# ./led7