Testing of digital circuits using Beaglebone Black

The aim of this project was to design a python based software on Beaglebone black to test small digital circuits designed on a breadboard. This would save time for researchers in labs and industries. The total cost of the project was Rs. 5000.

Components required

• Keyboard
• Beaglebone black
• HDMI display unit

Testing combinational circuits

Setup

Our setup was designed to test combinational circuits with up to 8 inputs and 8 outputs. For each input and output, user can configure the pin number on the Beaglebone black associated with it. For each output, user is required to specify a logical expression corresponding to the combinational logic implemented on the breadboard.

Output

After specifying the circuits, user can initiate a test for their combinational circuit. Beaglebone black automatically generates all possible inputs and applies it to the circuit on the breadboard. It captures the experimental output from the circuits, and compares it with the theoretical output of the expected logical expression. If all experimental and theoretical outputs match, the combinational circuit is declared to be working as expected, otherwise not.

Testing sequential circuits

For testing sequential circuits, user is required to specify the state transition graph associated with the sequential logic; this is achieved by specifying the adjacency matrix, input and output corresponding to each transitions. The algorithm then generates a shortest path to explore all transition in the state transition graph. Inputs corresponding to the shortest path is sequentially applied to the circuit; the output is measured after a small delay to account for transition delay of the circuit. If all the experimental and theoretical outputs match, the sequential circuit is declared to be working as expected, otherwise it generates an error report. The error report contains the transitions at which the error occured.

Algorithm for testing digital circuits

• Accept description of the device (combinational or sequential) under test.
• Scan through all possible sets of input for combinational circuit and minimal set of states and transition for sequential circuit.
• Display the result on a graphical user interface (GUI).

Graphical User Interface

Presentation

Author

Anurag Gupta is an M.S. graduate in Electrical and Computer Engineering from Cornell University. He also holds an M.Tech degree in Systems and Control Engineering and a B.Tech degree in Electrical Engineering from the Indian Institute of Technology, Bombay.

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