It’s more of a USB voltmeter than an oscilloscope (in the 100-200Hz range) and it’s using an ATtiny45 instead of an ATmega45 which doesn’t exits.

I saw one of these but it was using a pic, I had all the pieces to build it, I wanted to put some kind of input adjustment and protection on the front of it so I wasn’t blowing up microcontroller when I made a whoopsie. When I couldn’t figure it out I set it aside…

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.

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 …

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 ?

“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.

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

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

@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.

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