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  • Author Author: Former Member
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A simple DIY Oscilloscope with Arduino Uno and Mega

Former Member

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

  • Can u please give circuit diagram to how to connect 2.4TFT to ARDUINO MEGA 2560. We connected it as u showed like shield but it shows only white screen and not display was seen. When i tested it in ARDUINO UNO then it worked well but problem is only with ARDUINO MEGA(i even added that #include mega_2560 in swift.cpp .). Please give me the circuit diagram to connect tft 2.4 to ARDUINO MEGA.

  • I think so, but mine it isn't used like that, with the touscreen, may e in the near future i'll configure the buttons to be shown on the display and to use the touch for that:p

  • Is it possible to use the toughscreen of the display (LCD has it) to get easier to handle?

     

    Thank you for the pictures.

     

    Michael

  • Hy everyone,

     

    I managed to take some pictures of my setup, i will try the threshold modification for the switches in a couple of days.

    Also i am planning to measures the resistance of the hole PCB( if CH0 button is pressed, which resistance does the mega measure). I am planning to convert that voltage into the resolution seen by the mega: 5V is 1023, i will use this formula:

     

    my measurement(in volts) x 1023/5= what mega board detects at the input(the threshold numbers)

     

    Also i am planning in the next few weeks to port this thing, on a raspberry pi with a 2.8 inch resistive touchscreen and use the touchscreen to define some "on the screen" buttons to chage trigger settings, ch1,ch2 and so on.Also guys i build a 3phase wattmeter which displays for each phase: Vrms, Irms, power factor, real power, apparent power and reactive power using 3 arduino unos.

    If you would like a blog with this build let me know and i'll try to make one as explicit as possible.

     

    i think you' re right about the thing with the switches..because there are switches with the same resistor value, the arduino mega won't know the difference between them and it will get mixed signals and mess up the wave form and time component(depending on witch buttons are pressed).