array-gpio/examples/gpio2.js

array-gpio is low-level javascript library for Raspberry Pi using direct register access.

// Connect momentary switch buttons on input pin 11 and 13
// and an led for each output pin.

const r = require('array-gpio');
 
let sw = r.in({pin:[11,13], index:'pin'});
let led = r.out({pin:[33,35,37,36,38,40], index:'pin'});
 
let LedOn = () => {
        let t = 0; // initial ON time delay in ms
        for (let x in led){
                t += 50;
                led[x].on(t); 
        }
}
 
let LedOff = () => {
        let t = 0; // initial OFF time delay in ms
        for (let x in led){
                t += 50;
                led[x].off(t);
        }
}
 
r.watchInput(()=> {
        if(sw[11].isOn){
                LedOn();  // led's will turn ON sequentially with 50 ms delay
        }
        else if(sw[13].isOn){
                LedOff(); // led's will turn OFF sequentially with 50 ms delay
        }
});