如何使用pi4j用覆盆子控制继电器

Question

sorry for my english but i recently write code in java about controlling relay by raspberry but my code doesnt work , i used gpio_00 as output the problem is when i initialize it the relay led stay on even when i change stat to low here my code:

GpioUtil.enableNonPrivilegedAccess();
 gpioRelayLED2 = GpioFactory.getInstance();          
         relayLED2 = gpioRelayLED2.provisionDigitalOutputPin(RaspiPin.GPIO_00,"RelayLED2",PinState.LOW);
         //relayLED2.setState(PinState.LOW);
       relayLED2.setShutdownOptions(true, PinState.LOW,PinPullResistance.OFF);
       relayLED2.low();

it not turning !!

Answer 1

Some relays are low level triggered. You have to set HIGH output state for such relay to disable LED.