Estimation of Planck's constant using light-emitting diodes and microcontrollers
DOI:
https://doi.org/10.30972/eitt.927657Keywords:
software smoothing, Characteristic curve of LEDs, Microcontrollers, PWM and automation, Software smoothingAbstract
In this work, we estimate the Plank constant by measuring the characteristic I-V curves of light-emitting diodes (LEDs). To do this, we use a microcontroller, a simple low-pass filter to filter out high frequencies, a curve smoothing method, and an average of repetitions to eliminate imperfections in the voltage delivered by the port of pulse width modulation (PWM) used as a variable voltage source. The measurement of the diode voltages was carried out using the microcontroller’s analog pin. Automating the two tasks allowed us to obtain the diode's characteristic curve and the threshold voltage (V0). Using the V0 values and the emission peak of 4 LEDs, Planck's constant was determined with a relative percentage error of 2%.
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Copyright (c) 2024 Lautaro E. Basualdo, Miguel A. Candia, Rodrigo M. Gester, Lucas J. Fernandez; Patricio F. Provasi
This work is licensed under a Creative Commons Attribution 4.0 International License.
