Using a MCP4902 DAC to draw in the XY mode of an oscilloscope from a chipKIT Fubarino SD
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All of the images shown on the analog oscilloscopes were created by students that took the class.
A link to the lab and source code is given. The lab is taught using a chipKIT Fubarino SD prototyping board.
With the source code you can find a Microsoft Excel file that can be used to generate source code to draw pictures. Fill in the grid with 1's where you want to generate code for the specific pixel.
http://globedrop.com/mtsac/elec74/2014-spring/Week%208/ELEC74%20DAC%20XY%20Template.xls
There is not a schematic but the lab for the class is posted in the links below the pictures. Here is the link for this years lab (which at this point has not changed).
The lab has a chart telling how to hook the dac to the chipKIT Fubarino SD
Nice. There used to be a digital logic design class at Georgia Tech that did something like this. You'd build a TTL logic circuit to connect to a driver board. The board would send you 4 bits of a counter and you'd output 4 bits of X, 4 bits of Y, and a pen-up/down bit. Every quarter they'd change what you had to draw. You'd be graded on quality of the drawing and the cost of your circuit. It was a lot of tweaking your drawing points and order and checking Karnaugh maps.
I like it! Inspires me to post another scope XY project I built. A $10 transistor curve tracer built out of a 555, a 4-bit counter with outputs acting like a dac into a couple of op-amps.
I look at a scope and see a black and white TV. I've always challenge my students to try and read a video stream off of an SD card and use the scope as a video display. I wish I had more time to do such fun nonsense.
Jacob Christ
Rochus Keller
heinz
Ken Yap
pammyleong
Hi Jacob, did you post the schematics and source code ? if so where ? please.