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Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
You should consider getting an ARM module for about $25-$30. They have built in bootloaders that work directly with RS-232. Avi has made a fairly advanced oscilloscope application that you probably can get a copy of. It is easy to add frequency counters and frequency generators with just a few lines of code.
A bit more expensive but much faster sample rates and 100 times more powerful.
The application runs on this module: There are other slightly cheaper modules with better specifications that will work with some modifications to the program.
Registered Member #2008
Joined: Tue Mar 03 2009, 05:11AM
Location: USA, Frederick, MD
Posts: 118
So you are telling me about a ready made oscilloscope analog to digital converter module?
Maybe I will buy it. I don't want to risk building something that won't work and that is somethng i don't understand.
I like the idea of buying this device, Bjorn, but how can I turn this circuit into an oscilloscope that connects to my computer and to the circuit board being tested?
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Everything is ready made with 3.3 V A/D input, you need an external voltage divider for higher voltages and some sort of offset circuit for negative voltages.
You need to ask Avi about getting a copy of the software for the microcontroller and the PC. Then you have to upload the firmware to the module over RS-232, with some patience this is something anyone can do with a little help from the forum or chatroom.
Here is an example of what I made with that exact module, grabbing a video signal at 2 MHz sample rate. Low resolution and noisy but a recognisable picture. Only skill and imagination is the limit with fast 32 bit microcontrollers.
Registered Member #2008
Joined: Tue Mar 03 2009, 05:11AM
Location: USA, Frederick, MD
Posts: 118
So if i buy this circuit, i'll get myself a 4 channel ADC and DAC with a lot of other functions?
What socket is it going to input information into my computer through? Parralel port, serial port, usb? As I understand, it uses serial port.
Does it come with a manual describing the purpose of every single hole on the edge of the circuit board?
Does microcontroller on this circuit come pre-programmed? Do I have to program it with a programmer? Or I can just upload the code into the chip by the means of the circuit itself?
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Yes, the module has 4 A/D channels and a lot of different functions. Each pin has up to 4 different functions that can be configured by the code running on the chip.
The 4 pin connector on the right side of the module connects to a serial cable that comes with it. It also comes with a CD that contains the schematics and datasheet that explains everything. The datasheet is 285 dense pages that is very hard to understand if you are not used to working with microcontrollers.
The chip is empty except for the bootloader that can load code over the serial link. The only thing you need to upload code is a serial port and a program called Flash Magic
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Trying to build a cheap and simple oscilloscope. How to program an AVR?
