About GPIO, I post a blog when I start VoCore.
Please check this link http://vonger.cn/?p=473.

There is some note about how to finish this:

Connection:

That 330ohm resistor is necessary, without it, the LED will burn.

Command:
Already in this post http://vonger.cn/?p=473.

Advance:

We can write an API for this LED control, so we can simply control it from browser remotely 🙂 phone, computer, pad, anything have broswer.

Here is the code, based on VoWeb, just add one function:

int voweb_func_gpio0ctrl(socket_data *d, string_reference *pa)
{
    char buf[MESSAGE_SIZE] = "Invalid parameter.";
    FILE *fp;

    fp = fopen("/sys/class/gpio/gpio0/direction", "w");
    if(fp == NULL) {
        sprintf(buf, "update gpio 0 direction failed.");
        return send(d->sock, buf, strlen(buf), 0);
    }
    fwrite("out", 1, 4, fp);
    fclose(fp);

    if(memcmp(pa->ref, "on", 2) == 0) {
        fp = fopen("/sys/class/gpio/gpio0/value", "w");
        if(fp != NULL) {
            fwrite("1", 1, 2, fp);
            fclose(fp);

            sprintf(buf, "update gpio 0 value to 1 success.");
        } else {
            sprintf(buf, "update gpio 0 value to 1 failed.");
        }
    }
    if(memcmp(pa->ref, "off", 3) == 0) {
        fp = fopen("/sys/class/gpio/gpio0/value", "w");
        if(fp != NULL) {
            fwrite("0", 1, 2, fp);
            fclose(fp);

            sprintf(buf, "update gpio 0 value to 0 success.");
        } else {
            sprintf(buf, "update gpio 0 value to 0 failed.");
        }
    }

    return send(d->sock, buf, strlen(buf), 0);
}

And register this function:

string_hash_set(funcs, "gpio0ctrl", (uchar *)voweb_func_gpio0ctrl);

Here is compiled one and necessary html: download

Uncompress vocore.voweb.gpio.test.zip to local folder, such as “~/voweb.gpio”, and scp all of the files to root@192.168.61.1:~/

scp -r ~/voweb.gpio/* root@192.168.61.1:~/

Then run command in vocore.

/root/voweb 8080 /root/html

Just open 192.168.61.1:8080, you will find this page, now, just click on the switch, the LED is under your control.

Here is a simple video:

Any questions, just leave a comment under. 🙂
brandonhead, I like your question 😀