initial

node_modules/onoff/examples/blink-led-async.js

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+"use strict";
+
+const Gpio = require('../onoff').Gpio; // Gpio class
+const led = new Gpio(17, 'out');       // Export GPIO17 as an output
+
+// Toggle the state of the LED connected to GPIO17 every 200ms 'count' times.
+// Here asynchronous methods are used. Synchronous methods are also available.
+(function blink(count) {
+  if (count <= 0) {
+    return led.unexport();
+  }
+
+  led.read(function (err, value) { // Asynchronous read
+    if (err) {
+      throw err;
+    }
+
+    led.write(value ^ 1, function (err) { // Asynchronous write
+      if (err) {
+        throw err;
+      }
+    });
+  });
+
+  setTimeout(function () {
+    blink(count - 1);
+  }, 200);
+}(25));
+