Abstract
This paper considers a digital device for automatic checking of homework assignments in the digital circuits course. The assignment is to make a digital circuit corresponding to a given logical expression; the circuit is comprised of elementary logic gates. The process of manual testing the built circuit is very labor-intensive because checking a circuit with N inputs variables requires checking the correctness of the output variable for 2N cases. We propose automating this pro-cess with a special digital device. The device is comprised of a microcontroller connected to the circuit tested. The microcontroller is connected to a personal computer with an application written in C# for executing the main operations of the testing process. During testing, the student chooses from a database or enters the logical expression corresponding to the circuit tested. For the expression, the software generates truth tables where actual and required responses of the circuit are given. Actual circuit responses are acquired by probing the circuit via the microcontroller, and the expected values are calculated from the logical expression. The truth tables are then presented to the student with a message of whether the circuit works correctly or not. The device was integrated into the process of checking homework assignments in the digital electronics course, and it significantly sped up the process of checking homework assignment circuits, resulting in better education quality.
Highlights
Today, education is increasingly dominated by digital technologies, whereby all information used in education is transformed in the digital form [12]
The LED indicates the state of the output variable, and this state is compared to the required state determined by the truth table for the given logical expression of the assignment
We developed the device for automatic testing of digital circuits assembled by students within the framework of completing the homework assignment in the digital electronics course
Summary
Education is increasingly dominated by digital technologies, whereby all information used in education (sound, text, video, etc.) is transformed in the digital form [12]. The LED indicates the state of the output variable, and this state is compared to the required state determined by the truth table for the given logical expression of the assignment. This procedure is repeated for all rows of the truth table. The device has a keyboard for entering the assignment option number and an LCD for showing the test results This device greatly simplified the process of testing homework circuits, it had a number of drawbacks: The testing could only be done for the expressions hard-coded in the Arduino program. The device must not have the drawbacks of the earlier version [1] mentioned above
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