intel edison with grove lcd

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由intel xdk，例如，下面的过程能够打印Hello world至grove lcd上

var mraa = require ('mraa');

var LCD  = require ('jsupm_i2clcd');

console.log('Current version of MRAA is', mraa.getVersion());

var light = new mraa.Aio(0);

var lightValue;

var lcdMessage=" ";

var myLCD = new LCD.Jhd1313m1(6, 0x3E, 0x62);

loop();

function loop(){

    lightValue  = light.read();

    lightValue = Math.round( lightValue*.1);

    lcdMessage = "Light is @ "+lightValue+"%";

    myLCD.setCursor(0,1);

    console.log(lcdMessage);

    myLCD.write(lcdMessage);

    setTimeout(loop,1000);

}

假设碰到例如以下错误

ERROR:Error: Cannot find module 'jsupm_i2clcd'

at Function.Module._resolveFilename (module.js:338:15)

at Function.Module._load (module.js:280:25)

at Module.require (module.js:364:17)

at require (module.js:380:17)

at Object. (/node_app_slot/main.js:5:12)

at Module._compile (module.js:456:26)

at Object.Module._extensions..js (module.js:474:10)

at Module.load (module.js:356:32)

at Function.Module._load (module.js:312:12)

at Function.Module.run

能够通过以下的方法解决更新libmraa 和 upm

</pre><pre name="code" class="javascript">cat > /etc/opkg/mraa-upm.conf <<EOF

src mraa-upm http://iotdk.intel.com/repos/1.1/intelgalactic

EOF

opkg upgrade

opkg update

然后通过