Arduino as (slow) oscilloscope

RE: Arduino as (slow) oscilloscope

Former Member — Thu, 02 Jun 2016 21:12:17 GMT

This is sure really great. I've seen some similar sine wave generation project using Arduino compatible board (https://www.facebook.com/groups/AmebaIoTWW/ ).

RE: Arduino as (slow) oscilloscope

Former Member — Tue, 23 Feb 2016 03:26:57 GMT

Ok,Thank you very much

RE: Arduino as (slow) oscilloscope

Former Member — Thu, 18 Feb 2016 11:44:37 GMT

I am working on a similar kind of project,but i don't know how to measure the frequency of a signal that is being applied,is frequency calculations involves any delay considerations that is introduced by internal hardware?

RE: Arduino as (slow) oscilloscope

strb — Wed, 10 Feb 2016 12:12:15 GMT

I've update the two programs, I've partially followed your suggest.

Basically now I acquire a data packet of 1500 sample and simultaneously I measure the total time of sample acquisition and after I send the packet and the time to pc that plot the signal and display the sample frequency, I use this data also to obtain a more accurate signal's frequency estimation.

With "high" sample rate and only 1500 sample it isn't possible to display slow signals, so I can also change the sample frequency "on run", with this trick I can even capture slow wave, the sample frequency now can be selected from about 9 khz to 178khz,it is an huge improvement!

The next step is to use interrupts to automatically store samples and maybe create a "RAM shield" to increase the memory [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-2727734b-1589-4155-b867-320726e00416/8715.contentimage_5F00_1.png:16:16]

RE: Arduino as (slow) oscilloscope

DAB — Mon, 08 Feb 2016 21:40:47 GMT

I built one of the first digital oscilloscopes using an 8085 back in the early 1980's.

We were capturing radar patterns using a mixing device that would demodulate the signal and provide us with the power lobes.

We used a 32k byte RAM buffer and a fast 8 bit ADC to capture the data.

I programmed the software to display the plot and provide the user an ability to find signals and expand the time scale.

Once they had the area of interest the software would do a bunch of calculations and display the results overlayed on the signal display.

So I see no reason why you cannot do some reasonable work with an Arduino and a good display.

Sure you will be limited, but for most hobby/maker needs, it would be a reasonable capability.

DAB

RE: Arduino as (slow) oscilloscope

clem57 — Mon, 08 Feb 2016 00:16:57 GMT

A usb can run in bulk mode handling more data. https://en.wikipedia.org/wiki/USB#Media_Transfer_Protocol

Clem