But recording capacity is limited with PIC's EEPROM. Also the data can be recorded with 750 ms sampling time and 12 bit resolution. After that, distance is calculated and displayed on the LCD screen with sensivity of 0.1 cm. The time that passes between transmitter and receiver is evaluated by microcontroller. Trigger pulse which is appropriate to ultrasonic transmitter is provided by the PIC microcontroller. In the study, 40 kHz ultrasonic ultrasonic receiver-transmitter pair is used for distance measurement. measured and object's distance from sound source is determined by using speed of sound. At ultrasonic distance measurement, the return time of the sound pulse that is generated from sound source is. Therefore, ultrasonic sound is used for distance measurement because it has high energy, it can easily reflect from hard surfaces and it follows linear-straight path. Keywords : digital logic, simulator device, logic simulatorĬlassical measurement methods cannot be used at situations in which distance between two objects is constantly changing. It is recommended that the functionality of the device be improved with the use of a more powerful microcontroller like the PIC 18fXXX series to provide higher memory and more I/O terminals. The binary equivalent of the LED outputs, matched those in the truth tables in the manual computation. The researchers concluded that the simulator device exhibited accurate results/outputs for up to five-variables in a function and four functions in every trial. By carefully recording and tabulating the outputs of the device for several trials in a form of observation guides, relevant data had been gathered to validate its functionality and performance in terms of its intended use in the laboratory. The cost of the construction of the prototype is Php 7,716.00 including the cost of labor. A PIC microcontroller served as the processing unit and several input/output devices were utilized for user interface. Knowledge in hardware designing and programming in PIC Basic Pro had been employed to make the design of the simulator device. This also establishes the accuracy of the output of the simulator device and the reliability of its operation. The study designed a device as an aid for instruction in the Computer Engineering Laboratory.
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