This Oscilloscope Display project uses no external components! All you need is the microcontroller and a power source. Source code is provided so you can build your own.
Via: Electronics Lab
"After programming the micro via the ICSP connector, place a jumper between the pins VDD and VPP (reset input tied to Vdd). The oscilloscope will be set for 2mS/div on X axis and 1V/div on Y axis. One full screen contains 10 characters."
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This is pretty cool, but I wish the video wasn’t so blurry.
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Apparently he uses the voltage reference module as a DAC. Pretty interesting. Changing the message will require to hack the .hex though since he isn’t publishing the source code.
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I’ve loaded the HEX file and it looks like it is the CODE segment only. You have to set the DATA and the CONFIG by hand.