1 Introduction
On this module we put a 5mm LED and extend all pins to a 3-Pin 2.54mm spacing pin header. Pin V is power, G is grounded and S is data which is connected to a triode to turn the LED on or off. You can write high or low, or PWN signals(3.3V or 5V) to S. When you write high to S the LED will turn on and become brightest. When you write low to S the LED will turn off. If you write PWM signals to S the LED's brightness will vary depending on the PWM's signal variances. We provide red, green and white LED modules.
2 Features
- GPIO/PWM interface, 3.3/5V, PWM brightness control
- Tiny, easy to be used in various situations
- 2.54mm spacing pin
3 How To
- Connect to Tiny4412 SDK (1506)
Connect the module's pin S to GPIO PIN1, V to 5V and G grounded
Code Sample in C Under Linux
#include <stdio.h>#include <unistd.h>#include "libfahw.h" #define LED_BLINK_TIMES 10
int main(int argc, char ** argv)
{
int ledPin = TINY4412_GPIO_PIN1;
int i = 0;
int ret = -1;
if ((ret = exportGPIOPin(ledPin)) == -
1) {
printf("exportGPIOPin(%d) failed ", ledPin);
}
if ((ret = setGPIODirection(ledPin, GPIO_OUT)) == -1) {
printf("setGPIODirection(%d) failed ", ledPin);
}
for (i = 0; i < LED_BLINK_TIMES; i++)
{
if (i % 2) {
ret = setGPIOValue(ledPin, GPIO_HIGH);
} else {
ret = setGPIOValue(ledPin, GPIO_LOW);
}
if (ret == -1) {
printf("setGPIOValue(%d) failed ", ledPin);
}
printf("LED blinking times %d ", i);
sleep(1);
}
unexportGPIOPin(ledPin);
return 0;
}
Compile and Run
git clone http://github.com/friendlyarm/fa-hardware.git
cd fa-hardware
cd demo
cd matrix-led
make
Copy your compiled bin to your board and you are ready to go.
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