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BitStream is an embedded PIC application for constructing a low cost, low bandwidth, 1-bit digital storage scope. The PIC microchip performs the data acquisition (data stored locally) and then transmits the captured waveform serially (via Infra-red or wired RS232) for display.

Full construction details and user guide for this project can be found in the BitStream User Guide.

16f628  16f628

Features:

  • Sampling rates of 1/10/100/500 kHz.
  • Real-time compression of data, providing a sample buffer of between 160 and 40,000 bit samples (varies according to signal entropy).
  • Trigger edge selection (positive or negative).
  • Supports wired and wireless infra red connection to Palm PDA running SirPic.
  • Supports wired serial connections to other PDAs, laptop or PCs running SirPic or third party terminal emulation or data logging software.
  • Captured waveform is output in text graphic format with timestamps for quick and easy analysis.
  • Uses the popular Microchip PIC16F628 micro controller with a 4 MHz crystal.

Displayed Waveform:

top This is a Palm PDA screenshot for a captured sample signal
(a 4ms pulse at 10Hz, increasing to 13Hz after 0.30secs).