USB oscilloscope. Scheme, description

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A simple USB oscilloscope. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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Below is a USB oscilloscope project that you can build yourself. The capabilities of a USB oscilloscope are minimal, but for many amateur radio tasks it will do. Also, the circuit of this USB oscilloscope can be used as a basis for building more serious circuits. The circuit is based on the Atmel Tiny45 microcontroller.

Simple USB Oscilloscope

The oscilloscope has two analog inputs and is powered by a USB interface. One input is activated via a potentiometer, which allows you to reduce the input signal level.

The software for the Tiny45 microcontroller is written in C and compiled with Winavr and V-USB developed by Obdev, obdev.com/products/avrusb, which implements HID devices from the microcontroller side.

The circuit does not use external quartz, but the frequency from USB is 16.5 MHz. Naturally, one should not expect 1Gs/s from this sampling scheme.

The oscilloscope works via USB via HID mode, which does not require the installation of any special drivers. The software for windows is written using .NET C#. Based on my source code of the program, you can add to the software as you need.

A simple USB oscilloscope. USB oscilloscope software

The circuit diagram of a USB oscilloscope is very simple!

(click to enlarge)

List of used radio elements:

1 LED (any)
1 LED resistor, 220 to 470 ohm
2 x 68 ohm resistors for USB D+ & D-lines
1 x 1.5K resistor for USB device detection
2 x 3.6V zener diodes for equalizing USB levels
2 capacitors 100nF and 47pF
2 filter capacitors on analog inputs (10 nF to 470 nF), optional
1 or 2 potentiometers on analog inputs to reduce the input voltage level (if needed)
1 USB connector
1 microcontroller Atmel Tiny45-20.

Download archive for the project. The archive contains PCB files for Eagle, firmware, C sources including USB libraries and HID, a windows program (does not require installation) and its C# source.

Author: Koltykov A.V.; Publication: cxem.net

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