4/8ch Oscilloscope Logic Viewer 
   
THIS PROJECT SUPERCEDED BY
oLogic v1.4
This is a little project I came up with when I didn't own an MSO yet.
This project will allow you to view 4 or 8 logic channels on a standard analog scope.
You just need to hook up two scope connections;
CH1 connects to the output of the oLogic board
TRIGGER connects to any of the logic inputs you want to trigger off of.
Currently, to enter 4 or 8ch mode;
4 ch. - PIN_A1 is tied high
8 ch. - PIN_A1 is tied low
At the moment, keep PIN_A2 tied high, for chop mode, alt mode not working as expected at the moment.
But hey, feel free to modify and email me back, I will post your alt code update.
After all, this is an open source project.
Note:
The pic I have used is a PIC18F26K20, so you need a 3.3v reg for this chip.
Also keep 5v input to the rest of the circuit otherwise the performance of the DAC dies off teribly.
For crystal selection, I have done well using a 24MHz with X4 PLL, thus 96MHz. Performed well for me.
| | Project Specs | | version: | 1.2 | | mcu: | 18F2620 | | compiler: | CCS C |
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| Parts | | PIC: | 18F26K20 | | DAC: | MX7224 | | All Resistors: | 100K Ohm | | All Caps: | .01uF |
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