Author Topic: microcontroller oscilloscope  (Read 3859 times)

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Offline yalect

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microcontroller oscilloscope
« on: October 31, 2015, 10:10:53 am »
Hello,
I am looking for simple usb oscilloscope project based on microcontroller maybe Atmel it's better but working with high frequency above 25Mhz
may you have ideas?
thank you
 

Offline Fungus

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Re: microcontroller oscilloscope
« Reply #1 on: October 31, 2015, 10:23:50 am »
... simple ... above 25Mhz

That's a contradiction.

based on microcontroller maybe Atmel
Arduinos only run at 16Mhz and they take many clock cycles to read the ADC.
 

Offline promacjoe

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Re: microcontroller oscilloscope
« Reply #2 on: October 31, 2015, 04:34:53 pm »
Arduino DUE runs at 84Mhz, on a 32-bit ARM core microcontroller.
 

Offline Fungus

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Re: microcontroller oscilloscope
« Reply #3 on: October 31, 2015, 06:30:22 pm »
Arduino DUE runs at 84Mhz, on a 32-bit ARM core microcontroller.

I know that...  :palm:  But he said "Atmel microcontroller", not "ARM processor" so I'm guessing that's not what he was thinking of.

 

Offline nbritton

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Re: microcontroller oscilloscope
« Reply #4 on: October 31, 2015, 08:56:52 pm »
This is a fool's errand if your goal is to get a functional oscilloscope. You would be much better off buying something pre-made like the Analog Discovery which is capable of 45 MHz bandwidth and has differential inputs, get yourself an academic email address and you can pick this up for $159. Alternatively there is also the Red Pitaya.

It says in the datasheet that the Atmel XMega microcontroller's ADC only has the throughput for 4 MSa/s: http://www.atmel.com/products/microcontrollers/avr/AVR_XMEGA.aspx

 

Offline promacjoe

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Re: microcontroller oscilloscope
« Reply #5 on: November 01, 2015, 12:55:57 am »
Arduino DUE runs at 84Mhz, on a 32-bit ARM core microcontroller.

I know that...  :palm:  But he said "Atmel microcontroller", not "ARM processor" so I'm guessing that's not what he was thinking of.

I thought it Included all Arduino+Atmel products.
The Arduino Due is a microcontroller board based that uses the Atmel SAM3X8E ARM Cortex-M3 CPU.

otherwise I would've included the pcDuino3, it is a 1GHz ARM Cortex A7 Dual Core. But it is not an Arduino product. Only Arduino compatible.
 

Offline Fungus

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Re: microcontroller oscilloscope
« Reply #6 on: November 01, 2015, 02:23:40 pm »
This is a fool's errand

...unless your only goal is to learn about "making ascilloscopes".

You would be much better off buying something pre-made like the Analog Discovery which is capable of 45 MHz bandwidth

No it isn't. It's more like 10 MHz.

« Last Edit: November 01, 2015, 02:25:28 pm by Fungus »
 

Offline Fungus

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Re: microcontroller oscilloscope
« Reply #7 on: November 01, 2015, 02:24:48 pm »
I thought it Included all Arduino+Atmel products.

You never know  :-//  I was just guessing based on the tone of the post.

It's not going to makee a 25MHz 'scope either way.


 

Offline Fungus

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Re: microcontroller oscilloscope
« Reply #8 on: November 01, 2015, 04:56:43 pm »
With the BNC adapter board its measured 3db BW is 25MHz or greater.

OK, didn't know that.  :-+

It's quite a fun/useful device if you can get the discount.
 

Offline Zero999

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Re: microcontroller oscilloscope
« Reply #9 on: November 01, 2015, 06:32:08 pm »
This is a fool's errand if your goal is to get a functional oscilloscope. You would be much better off buying something pre-made like the Analog Discovery which is capable of 45 MHz bandwidth and has differential inputs, get yourself an academic email address and you can pick this up for $159. Alternatively there is also the Red Pitaya.

It says in the datasheet that the Atmel XMega microcontroller's ADC only has the throughput for 4 MSa/s: http://www.atmel.com/products/microcontrollers/avr/AVR_XMEGA.aspx
I agree but you definitely need the discount, otherwise you're better off with an entry level Chinese 'scope such as something from UNI-T, Hantek, Owon Rigol etc.
 


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