1var dac = require('dac');
2
3// led灯
4var vol = dac.open({
5  id: 'light',
6  success: function() {
7    console.log('open dac success')
8  },
9  fail: function() {
10    console.log('open dac failed')
11  }
12});
13
14vol.writeValue(65536 / 2)
15
16var value = vol.readValue();
17
18console.log('voltage value is ' + value)
19
20vol.close();