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OK. I'll try that. It's better than complaining all the time. :-) Where should i start?

Your question 'is MIDI actually a HID device' took me by surprise. I searched the web for more information to make sure that i use the proper terminology (Midi , USBMidi, HIDMidi, Midi over USB, etc.) and among others i found this interesting post by Paul Stoffregen.

http://forums.adafruit.com/viewtopic.php?f=51&t=51683&p=262051#p262017

@andrewn: I am trying to get enough facts together to convince Gordon that USB-Midi is a 'must have' feature. :-) But he is right. Not too many users asked for it and its not so easy to implement. I would definitely use the pico for my USB-Midi projects because i like the nodejs / closures / events / modules - concept.

A alternative to USB-Midi could be OSC over USB/Serial/SLIP. It is supported by pd, Max, Ableton Live, Native Instruments and many others. But i don't know if that's easier to implement?

http://cnmat.berkeley.edu/oscuino
https://github.com/CNMAT/OSC
https://forum.pjrc.com/threads/18849-Open-Sound-Control

Oh no. I really wanted to replace my HiDuino based project with the pico. It would have been so much more fun with all its javascript goodness. :-)

https://github.com/ddiakopoulos/hiduino

@gordon: Good news. I updated / downgraded ? my pico from 1v80 to 1v79.210 and it seems to work very well now. Thanks a lot. Great work.

@all: Is somebody already working on a USBMidi module?

OK. I did some more test. My Mac recognises the pico HID mouse only at reboot. If i re-plug the pico the magic is gone.

Yes i did uploaded the code, called save() and re-pluged it. It did not work. I tried several times. Today i restarted my Mac with the still connected pico and suddenly it worked. Exactly 3 times. After that the pico did not respond anymore. (No LED on|off toggle) After opening the WEB-IDE i did get this message.

Connected
>Loading from flash...
WARNING: Expecting a number or something iterable, got undefined
WARNING: Expecting a number or something iterable, got undefined
>
=undefined
>
=undefined
WARNING: Expecting a number or something iterable, got undefined
WARNING: Expecting a number or something iterable, got undefined
WARNING: Expecting a number or something iterable, got undefined
WARNING: Expecting a number or something iterable, got undefined
WARNING: Expecting a number or something iterable, got undefined
> 

Hi Gordon, i did try to get this HID example up and running but it does not work for me.
I can toggle the LED if i press the button but the mouse cursor does not move.

var mouse = require("USBMouse");

function toggle() {
  on = !on;
  digitalWrite(LED1, on);
}

setWatch(function() {
  mouse.send(20, 20, mouse.BUTTONS.NONE);
  toggle();
}, BTN, {debounce:100, repeat:true, edge:"rising"});

Maybe i am missing something here? Should the pico show up as a mouse device in my system USB device tree?

ioreg -p IOUSB -w0 | sed 's/[^o]*o //; s/@.*$//' | grep -v '^Root.*'

The only relevant device i can find with this call is the STM32 Virtual ComPort.
I am using OS X 10.10.4 and Espruino 1v80

Thank you. Thats exactly what i was looking for.

I am more than happy with this little board and its JS implementation. It does more than i have ever expected and it is rock solid. And the best thing is that if i stumble across a "minor" problem and post it to this forum Gordon is there and fixes it faster than i can update my board. So thank you very much Gordon for this great support.

Hi DrAzzy, i've written a very simple web service for the espruino & CC3000 and a little filesystem based db that uses the sd-card as its storage. So when my web service adds data to the db it writes a file and when it removes data from the db it needs to delete the corresponding file from the sd-card. Its simple and slow but it works great. Except for the delete.

Hi. I couldn't find a fs.deleteFile() or something similar in the docs. Do i have to use a other lib than require("fs") to delete a file or directory from sd-card?

fs.readFileSync in v1.51 now returns undefined if the file is not found. Thanks a lot Gordon.

I would prefer to get a 'undefined' instead of an empty string. This way its easier and cleaner to decide if the operation was successful and what actions to take. e.g. send 200 vs. 404.

Hi Gordon,
thanks for the update.

Is it possible to get the data of a post request from within the http.createServer callback?

http.createServer(function(req, res) {
    if (req.method == "GET") {
        // do get stuff
    } else if (req.method == "POST") {
        // save post data to sd-card
    }
}).listen(port);

I am using this code in a slightly modified version.

function parseUrl(url) {
	var idx = url.indexOf("?");
	var data = {
		path:"",
		param:{}
	};
	
	if (idx >= 0) {
		var args = url.substr(idx + 1).split("&");
		
		for (var n in args) {
			var arg = args[n];
			var eq = arg.indexOf("=");
			
			if (eq < 0) {
				eq = arg.length;
			}
			
			data.param[arg.substr(0, eq)] = arg.substr(eq + 1);
		}
		
		data.path = url.substr(0, idx);
	} else {
		data.path = url;
	}
	
	return data;
}

This way i get a JSON Object with path and parameter.

parseURL("/hello?key=val&foo=bar&something");
//{"path":"/hello","param":{"key":"val","foo":"bar","something":''}}

... a small typo in line 9.

if (eq<0) eg=arg.length;

should be

if (eq<0) eq=arg.length;

How can i catch an fs.readFileSync error if a requested file is not available on sd-card? Right now i get the same result for an empty file and if the file is not available.

Hi ltj, i am working on something like this right now. I added a Adafruit CC3000 WiFi board to the Espruino board and wrote a very basic file server to list, serve and save files to the sd-card. Everything works just fine except for saving files. I always get a "ERROR : Unable to write file : INVALID_NAME". Once i get around this error it should be possible to use the saved files via "require".

Another thing i want to try is to backup the state of the server to the sd-card if the connection drops and reinitialise the server if the connection is available again.

I would like to hook up this sensor http://www.drotek.fr/shop/en/home/62-imu-10dof-mpu6050-hmc5883-ms5611.html via I2C to the espruino. Is this at all possible? If so, how can i save my js wrapper library to communicate with this sensor to the espruino SD card?

Hi Gordon. Congratulations. Kickstarter successfully funded your great project. I can't wait to get my 'Low Power Wireless Kit' next year. All the best from Cologne, Germany