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  • Author Author: e14 Contributor
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A simple DIY Oscilloscope with Arduino Uno and Mega

e14 Contributor

My DIY Oscilloscope, how i got my signal image

 

Content :

- Description

- Screenshots

- Video

- Credits and links

 

Descriptions

 

I am experimenting with RF and IR signals in various frequencies and had some trouble with the receivers and needed to see what kind of signal i was receiving.

I cannot afford a real oscilloscope but i knew about the older Arduino oscilloscopes.

 

After trying many different versions of code and tutorials, I was unable to get a single one to work, and all the tutorials and guides around was 2-3 years old.
Not sure if it is the IDE or the actual hardware that has changed in such a way that it didn't work anymore.

 

I finally found a working oscilloscope from a Japanese website, (linked below) and a working TFT screen library,

meaning i could read the various signals received.

 

Clearly the limitations are 0-5v but that is fine, what i needed to know is either wave type and frequency, and this is sufficient.
It also gives me an indication of the amplitude which is just a nice bonus.

 

But what I'm most happy with, is the two channel feature, i often use the second channel as a reference point to be able to

differentiate the main channel on the screen.

 

 

Some screenshots..

This is the .96" OLD test, single wave test imageimage

 

 

 

imageimageimage

2.4" TFT screen on the Uno,    two right images same screen on a Mega.

 

 

A youTube vidoe i made on the experience.

 

 

 

Credits and Links :

 

My compilation of the Oscilloscope and TFT library  ( what you see on the video and images ) :

https://dl.dropboxusercontent.com/u/19761809/arduino/Vaupell-Oscilloscope.zip

 

 

Original Oscilloscope link (code by : Noriaki Mitsunaga ) :

http://n.mtng.org/ele/arduino/oscillo-j.html

 

 

Original TFT display link ( TFT shield library source ) :

http://www.smokeandwires.co.nz/blog/a-2-4-tft-touchscreen-shield-for-arduino/

 

TFT library :

Library : https://github.com/Smoke-And-Wires/TFT-Shield-Example-Code

Attachments:
Vaupell-Oscilloscope.zip
  • in reply to e14 Contributor

    I'm glad you succeded with the TFT, i have the exact same tft as you:))...

    I've modified the ino file last night to show the voltages on the grid lines, just to be more easy to determine de voltage of the waveform and also a little error i spotted in the code, i'll post the new code in maximum 3 hours with explanation.

    When you measured  the 220v to 9v supply how exactly did you do that? Did you used a resistive divider to reduce the 9v to a arduino-readable voltage(5v)?

    I'm asking because arduino boards can only measure 0V to 5V positive.Using a resistor devider and a couple of other electronic components you can measure negatives also, i'm planning to do that   this weekend..so, i'll keep you posted.

     

    If you have any questions you can post them hear, but this evening i'll try to make a tutorial of what i did so far and post it.

     

    I'm currently at work, otherwise i would have sent you the code already.

     

    Have an awesome weekend and i'll keep you updated.I'd like to ask you to make some photos of your measurements and the label of the supply and explain how did you exactly measured.

     

    Thanks.

  • Thank you Mihai Arald! It works now!

     

    First I tried it with mp3-Input from smartphone (see picture).

     

    What I found out is while using a 220V-to9V supply it shows whide sinus lines (without a signal in - picture 2), but when I supply the Mega with USB-supply it is different (also without signal in - picture 3).

     

    I will test it instead a loigic probe next time.

     

    Have a nice weekend.

     

    Michaelimageimageimage

  • Thank you, I will try it!

     

    Have a nice weekend.

     

    Michael

  • Hello guys,

     

    I'm back with the files, i'm new to this forum and i'll put this link here: https://we.tl/KmKLOOxoHo.The file contains the .ino file and the zip file of the tft library(SPFD5408) and the code change you can see in this image:

    image

     

     

    I didn't connected yet the switches but the programs runs fine, if you have some schematics of the wiring i would sure appreciate it, just leave me please a comment.

     

    Hope it helps some of you out there, and Thank you vaupell for this tutorial.

     

    Does anyone have any ideea about the resistor values in Mitsunaga's electrical schematic? Those values shown in the schematic are in Ohms or kOhms.(my guess they are in Ohms)...

     

    recycler66 i'll post today(maybe in the evening) the full sketch, pictures, libraries, config and schematics...that is if i succed in making in work(I think i'm gonna make today my first post here on the site and post here the link)

     

    Best regards,

     

     

    Mihai Arald

  • in reply to e14 Contributor

    That will we fine. I will wait for your configuration, setup and sketch/library, here.

     

    Best regards and thank you

     

    Michael