Homemade Logic Analyzer with Four Channels

This logic analyzer is built around the PIC18F4580 microcontroller where the 4 channels operate at 200Hz to 2MHz sampling frequency.

The use of a logic analyzer is the best way to inspect digital signals. This 4-channel logic analyzer is suitable for on-site and loating measurements because it is powered by battery and due to its compactness. There are 1024 samples of the signal that can be stored in each channel since the circuit has sufficient memory where a PIC18F4580 functions as the heart of the circuit. A clear representation of the signal and traces are displayed on a dot matrix display with a resolution of 64×28 pixels.

The display is driven and the signals are sampled by the PIC controller which can be controlled through push button switches. The maximum sampling rate is determined by the 10MHz crystal while an internal clock frequency of 40MHz is being given by the controller using the internal PLL of the microcontroller. The voltage input range is up to 5V and the inputs are protected against high or negative voltages by diodes. A 74HC04N is being used as a buffer which feeds on the input signals.

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