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Dear all I want to use (lcd screen) in my project to use it as CRO (oscilloscope) to show the output waveform of the voltage across the load

What is the type and the dimension of( lcd screen) I can use it to show me the output waveform in any scale and how can I connect it across the load
and what is the code to do that i use micro c in programming

Thanks and regards

dear all if this idea is impossible or can't be deigned please tell me

Your question was far too general to be answered, which is probably why no one responded.

the problem is it seems like you want someone to do all the work for you.

What is the type and the dimension of( lcd screen) I can use it to show me the output waveform in any scale and how can I connect it across the load
and what is the code to do that i use micro c in programming

You have to decide the LCD you want to use.
You have to figure out how to connect it (we can help tho)
You have to write the code for it (we can help also)

But we will not do it all for you.

i didn't use ay graphical lcd before so i ca't decide waht is the dimenion suiable for this lcd and i didn't know the basic commands to try to write a code for it

What microcontroller are you planning to use? As for the GLCD a 128x64 is course but common.

it certainly is doable with a mcu. you can use an adc to digitize the signal (either onboard adc or external ones), and then display it. most 20mhz scope can get down to 0.1us/div, or 10mhz/div. assuming 10 points per div, that means you need to sample at 100mhz. the fastest onboard adc I have seen can do 1mhz. That means they can do 10us/div + 10 points / div. good enough for audio work.

bit depth isn't a big issue: around 300 points (> 8bit depth) would be sufficient.

It's just a toy really but it does have it's uses on low speed waveforms and being portable helps too. If I were going to buy a scope I'd prefer an old analogue 10MHz scope which can probably be found on ebay for the same price.

I went to a radio rally last Sunday, there was a stall selling good working double-beam scopes for between £20-£30 - all connected up and displaying the output from signal generators.

thanks for all useful information you provid me with it

check this site out maybe have what you want **broken link removed**

for the scope view the OLED displays are "best" IMHO.

good:
- fast (many times faster then normal lcd's)
- low pin count (most of them have spi interface)
- low power usage
- much better picture then ordinary lcd (brighter, sharper ...)

- gentle (easy breakable, not easy to mount etc)
- not that well documented (not widely used by hobbyists so not that much demo code around)
- small size

It's only 128x128 though.

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