Plastic Optical Fiber Sensor Data Acquisition Using ADC0804 and PC Parallel Port

Imam Khambali, Budhi Priyanto and M. Chasrun Hasani
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Imam Khambali: Department of Electrical Engineering, University of Muhammadiyah Malang, Malang, Indonesia
Budhi Priyanto: Department of Electrical Engineering, University of Muhammadiyah Malang, Malang, Indonesia
M. Chasrun Hasani: Department of Electrical Engineering, University of Muhammadiyah Malang, Malang, Indonesia

International Journal of Research and Scientific Innovation, 2025, vol. 12, issue 4, 360-365

Abstract: The design and manufacture of a solution turbidity tracking device with a plastic optical fiber (POF) sensor system has been carried out. The input of the optical fiber sensor is in the form of red LED light with an input voltage of 5 Volts. The sensor head is dipped in a solution with a certain turbidity so that some light leaks into the solution. The output voltage of the fiber is received by the phototransistor and amplified by the differential gain of the Op-Amp LM 324 of 88.5 times, then converted to digital with the ADC0804 and interfaced to the computer for reading via the LPT port. The test of the equality error between the digital reading results (PC) and analog (Voltmeter) is 0.8%. Sensor testing on aquades solution gives an output voltage value of 3,176 volts. There is a change in the external voltage value when amylum is added to the solution with a concentration of 1g/50ml, which is 3.372 volts.

Date: 2025
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