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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Latest project, dual channel USB osciloscope

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nigel wright

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My latest project is a dual channel USB oscilloscope.
It uses a PIC32MX220 which has 1 mega samples A2D.
The input is a standard scope front end with 1 meg ohm and 10pf.
The signal is buffered then scaled using 74HC4015 and a bunch of resistors.
The embedded software basically measures the A2D for the two channels and stores it in a pair of buffers.
The PIC can use +ve or -ve trigger or no trigger.

The PC end displays the two channels on top of a graticule.
The display can be shifted up and down and left and right.
The trigger level can be set or disabled.
The voltage scaling can be set for both channels.
I have also added a FFT display for displaying frequency content.
 
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