Your goal is to achieve the highest Signal Quality (SNR). Use the sliders to adjust the participant's characteristics and the sensor's settings. Observe how the PPG waveform and score change. Notice how LED intensity can compensate for challenges like darker skin tones.
This simulation's logic is derived from the quantitative findings in Charlton et al. (2025). The Signal-to-Noise Ratio (SNR) is calculated using coefficients from the paper's statistical models (specifically Table 5 and Figure 7):
+0.12 dB per year.-0.52 dB for each level on the Fitzpatrick scale.Charlton, P. H., Marozas, V., Mejía-Mejía, E., Kyriacou, P. A., & Mant, J. (2025). Determinants of photoplethysmography signal quality at the wrist. *PLOS Digital Health, 4*(6), e0000585. https://doi.org/10.1371/journal.pdig.0000585