EPEonline - Project Description

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PIC-Based Dual-Channel Virtual Oscilloscope

Approx construction cost US$53

PIC-based Dual-Channel Virtual Oscilloscope project -- EPE Online October 2000

A virtual oscilloscope for monitoring audio frequency waveforms via your computer.

Mid-range is perhaps a reasonable description of this design. At one end of the scale of EPE virtual oscilloscope designs is the simple Analogue Input Waveform Display computer interface used with the Teach-In 2000 series. At the other end is the sophisticated and versatile EPE Virtual Scope of Jan/Feb '98.

Sitting between these two designs is the PIC V-Scope described here. It provides waveform display of two signals simultaneously at rates much higher than the TI design offers, although lower than V-Scope can handle. It is considerably easier to construct than V-Scope. With care, even less-experienced hobbyists should stand an excellent chance of constructing it successfully.

Specifications

PIC microcontroller performs analogue-to-digital conversion, buffer memory storage/recall and o) output to PC-compatible computer for display
Computer control of all PIC program modes
Selectable dual channel or either channel individually
Two signal display modes, analogue and digital
Waveform gain switchable for x1 or x10
Input impedance 10k ohms and 100k ohms
Maximum input signal level before display clipping 5V pk-pk, or 50V if x10 scope probe is used
Input switchable for AC or DC
Waveform synchronisation (sync) selectable on/off by channel, with controllable trigger levels
Waveform shift vertically for each channel
Frequency range: nominally audio, but extending well below 1Hz and above 10kHz
Frequency counting and waveform amplitude monitoring for each channel, selectable on/off
Frequency count accuracy presettable from screen for fine tuning, with automatic recall of settings on start-up
Three sampling modes: via 2Kbyte or 32Kbyte buffer memory, or immediate
Screen grid on/off
Waveform display hold on/off
Waveform data output to disk, on demand or automatic, date and time stamped
Waveform data input from disk files
Disk files selectable by mouse from on-screen directory
Operation via parallel printer port
Port address selectable on-screen, with automatic recall on start-up
Screen dump to printer, date and time stamped
All functions mouse-selectable
Additional keyboard control for some options

This project originally appeared in the October 2000 issue of EPEOnline. >> PURCHASE <<