Edison and arduino sd card slot

[wicktus]

Hello, I recently bought an intel edison, since I'm familiar with Javascript I decided to install Johnny-five on it :), works like a charm so far, having a blast with Johnny-five ^ ! But I cannot seem to find a way of writing to an sd card, I'm talking about an sd card inserted into the arduino shield ;). I know that fs = require("fs") allows the use of the node fileSystem api, but I cannot find how to "detect" my sd card reader component. there's no var servo = new Five.servo(9) for the sd card reader that I know of. Thanks for your help and sorry if i sound noobish I just begun using Johnny-five, GOOD work team ;)

I need it to put in place a datalogging feature.

[dtex]

Which Arduino shield are you using? I suspect that you won't be able to do this without a customized version of firmata.

[wicktus]

Hello, I'm using this breakout board : https://www.adafruit.com/products/2180

[dtex]

So you're not using a separate data logging Arduino shield? You're just wanting to read the SD card on this breakout board correct?

[rwaldron]

there's no var servo = new Five.servo(9) for the sd card reader that I know of.

That's correct. SD card interaction is not in scope for Johnny-Five, but it should be easier than it presently is...

I was not surprised to learn that this process is painful on the Edison, so I spent some time this morning figuring out a reliable way to detect when an sdcard is inserted or removed on the Edison. What I came up with is available as a module called sdactivity:

(On the Edison)

npm install sdactivity

Then use like:

var SDActivity = require("sdactivity");

var sd = new SDActivity({
  sdpath: "/media/sdcard"
});

sd.on("mount", function() {
  console.log("Mount");
});

sd.on("unmount", function() {
  console.log("Unmount");
});

https://github.com/rwaldron/sdactivity

[wicktus]

Well thanks that will help ! Will look at datalogging tonight, I still can use traditional Javascript and Node FS/jsonfile for datalogging I hope.