Comments on: USB oscilloscope

By: Dan

Dan — Tue, 20 Jul 2010 06:09:28 +0000

I am having difficulty with my pc recognizing this as a HID USB device. The pc recognizes it as a usb device, but doesn’t know what it is so it disables it. What am I doing wrong?

Also, what do you mean by “Do not forget to set the fuses for internal PLL clock” and how do you do that?

Thanks,
Dan

By: Whatnot

Whatnot — Sun, 07 Mar 2010 13:05:16 +0000

It’s a $5 project, of course it doesn’t equal a real full USB oscilloscope, be reasonable.

By: patrick

patrick — Sat, 06 Mar 2010 20:51:48 +0000

@tim: Point taken, depends what the purpose of the board is. If you intend it as a “fast voltmeter”, then I’ll agree. However, I still can shortcut the analog filter in the input-stage if needed. Just to say: a scope with less than a few kilosamples/s is rarely useful in practice.

By: tim

tim — Sat, 06 Mar 2010 20:02:13 +0000

yes, the bottleneck is the usb hid firmware inside the AVR, all is done by software, the decoding of the usb 12mbits/s is done in assembly.On the firmware side, it is not a newbee project. But if you can solder and you can flash a tiny, it is very easy to build, and so low cost

By: w

Sat, 06 Mar 2010 16:38:12 +0000

@jason_chicago I quote:
“Do not expect more than 100′s of sample/S, the bottleneck is in the HID interface.”

By: w

Sat, 06 Mar 2010 16:35:54 +0000

Lol did you see that picture in the comments on that site? What a poor soldering job that is, wow :)
http://img377.imageshack.us/i/1008528ga7.jpg/
We all gotta learn I guess eh.

By: jason_chicago

jason_chicago — Sat, 06 Mar 2010 16:30:19 +0000

200Hz? I thought ATtiny’s can pol data at much higher rate, many kHz’s. So, is the slowdown merely due to implementation?

By: Tyler S.

Tyler S. — Sat, 06 Mar 2010 15:18:54 +0000

hey where did u get this bord. i mean im kinda noob @ this stuff but im tryin to build a hand held flamethrower and i need this bord to hook a servo.

By: M4CGYV3R

M4CGYV3R — Sat, 06 Mar 2010 11:50:05 +0000

“port this from this chip to an(sic) Arduino”

That’s going backward in quality and simplicity.

This circuit’s MC is from the same general family as an Arduino’s MC. There’s no good reason to move from a solid non-Arduino project back to the noobish overkill that is Arduino.

As far as the program, I haven’t even looked at it but being in C#, it should be exceedingly easy to interface with com ports to transmit and receive serial data over USB.

By: bob

bob — Sat, 06 Mar 2010 09:38:04 +0000

i was wondering, as a newbie to the atmel/arduino world, how easy would it be to port this from this chip to a arduino 168, 328, mega aeduino, so that the arduino board is cloning the small atmel controller, but still using the original p.c. peogram with the arduino.
has any one arempted this yet

By: tim

tim — Sat, 06 Mar 2010 01:33:41 +0000

i am the designer, macegr is true when he says it is more a voltmeter than a scope, but it gives a lot of possibilities for the bucks, temperature monitoring, power usage, battery charge so many things that are happy with a few samples/s.

patrick, how do you get the DC component with your sound card ?

By: Devin

Devin — Sat, 06 Mar 2010 01:10:03 +0000

Ha, I knew I wasn’t crazy.
http://hackaday.com/2008/10/02/amazingly-cheap-dual-channel-scope/

By: patrick

patrick — Fri, 05 Mar 2010 23:29:03 +0000

200 Hz? You’re kidding, right? Instead I would just use my 192 kHz soundcard, and this will leave me with no extra parts and no PCB …

By: Marco

Marco — Fri, 05 Mar 2010 23:22:20 +0000

It’s the sampling rate that kills this unfortunately. I built sth. similar with Arduino as voltmeter and Wiring as the host platform. Very simple to do but at 20kHz not too useful.

By: D-

D- — Fri, 05 Mar 2010 22:10:43 +0000

Can’t download the associated zip files at this time, so this will be something left for future study. Assuming I remember to do so.