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Serial Oscilloscope


Serial Oscilloscope is a Windows application that plots comma-separated variables within any incoming serial steam as channels on a real-time oscilloscope. The application also functions as a basic serial terminal, received bytes are printed to the terminal and typed characters are transmitted. The project uses Michael Bernstein's oscilloscope library to plot up to 9 channels on 3 different oscilloscope with view and trigger menus.

Serial Oscilloscope is compatible with any serial stream containing comma-separated values terminated by a new-line character ("\r"). For example, "11,22,33\r" will be interpreted as values 11, 22 and 33 for channels 1, 2 and 3 respectively. The serial stream can also include non numerical characters which will be ignored. For example, "a=0.5,blue,x=3.14,t1t2t3,8\r\n" will be interpreted as values 0.5, 3.14, 123 and 8 for channels 1, 2, 3 and 4 respectively.

The source files also include an Arduino sketch to send analogue input values over serial. Up to 6 ADC channels can be enabled by sending the characters "1" to "6" to the Arduino. Enabling more channels will reduce the sample rate.

In the YouTube video I show the Arduino and Serial Oscilloscope being used to plot data from an IR distance sensor, a triple-axis accelerometer and a microphone.

Precompiled binary files can be downloaded from the x-io website.

Version history

  • v1.0 Initial release
  • v1.1 Supports non-standard baud rates. Disable terminal feature added.
  • v1.2 Fixed memory leak and bug that prevent plotting of negative numbers.
  • v1.3 No longer ignores "." for plotting decimal values.
  • v1.4 Clear terminal menu item added
  • v1.5 Log to file tool. Remove non-numerical characters from port names.