我试图使用在网上找到的一些代码使树莓派上的LED灯闪烁(我知道不是最好的方法,但这是一个教程网站)。
当我运行以下Python代码时,LED灯会闪烁:
import RPi.GPIO as GPIO
import time
pinNum = 4
GPIO.setmode(GPIO.BCM) #numbering scheme that corresponds to breakout board and pin layout
GPIO.setup(pinNum,GPIO.OUT) #replace pinNum with whatever pin you used, this sets up that pin as an output
#set LED to flash forever
while True:
GPIO.output(pinNum,GPIO.HIGH)
time.sleep(0.5)
GPIO.output(pinNum,GPIO.LOW)
time.sleep(0.5)
当我运行以下Java代码,它应该做相同的事情-但我只能看到我添加的打印语句,没有闪烁的灯
import com.pi4j.io.gpio.GpioController;
import com.pi4j.io.gpio.GpioFactory;
import com.pi4j.io.gpio.GpioPinDigitalOutput;
import com.pi4j.io.gpio.PinState;
import com.pi4j.io.gpio.RaspiPin;
public class ControlGpioExample {
public static void main(String[] args) throws InterruptedException {
final GpioController gpio = GpioFactory.getInstance();
final GpioPinDigitalOutput ledPin = gpio.provisionDigitalOutputPin(RaspiPin
.GPIO_04, "MyLED", PinState.LOW);
System.out.println("Started");
try
{
while(true)
{
System.out.println(ledPin==null);
System.out.println("Looping pin now");
ledPin.high();
System.out.println("Set high called");
Thread.sleep(2000);
ledPin.low();
System.out.println("Set low called");
Thread.sleep(2000);
}
}
catch(Exception ex)
{
gpio.shutdown();
ex.printStackTrace();
}
}
}
有人知道这可能是为什么吗?我认为从逻辑上讲,它们应该做相同的事情-两者都使用pi的相同GPIO引脚号码
谢谢你的帮助