Real Time Wearable Locator Device for Distress

  • Mary Rose N. Navarro
  • Nestor R. Valdez
  • Mark Joseph B. Enojas
  • Technological University of the Philippines Taguig Campus
Published in

  • This paper presents a study in the development of a real time wearable locator device for distress which uses human pulse rate. A person who is in distress normally has delayed reaction. However, a good means of identifying distress is through pulse rate in which a notification can be done even before the person can make a distress call. An increase in pulse rate signal can be classified for illness, exercise, or a strong emotion. A comparative analysis of signals was conducted based on the instance of emotion shift by cinematic terror assumed to determine distress compared to that of a normal and in exercise condition. An inexpensive prototype was developed using wearable wrist band which is embedded with a pulse rate sensor, GPS and GSM modules for tracking location. In addition, notification to an emergency contact is sent via SMS and a locator map can be viewed through a smart phone or computer. The results show the distinct characteristics of the heartbeat of a person in distress with an increase of an average of 37 bpm in 10 seconds or 41±3% increase from the normal heart rate. The device is calibrated in a 1-minute initialization to register normal heart rate. The reaction rate of the wearable locator device is proven to be faster than the reaction time when a person picks up a phone, dial, and make a distress call. The reaction time for sending a distress notification varies depending on strength of the mobile network signals. A robust design can further be developed in the future through a more intelligent way of identifying distress with both pulse rate and brain activities.

  • pulse rate, wearable devices, distress locator

Cite As
  • APA 7th Edition:
    Navarro, M., Valdez, N., & Enojas, M. (2019). Real Time Wearable Locator Device for Distress. Innovatus, 2(1), 54-59.
  • Harvard:
    Navarro, M., Valdez, N. and Enojas, M., 2019. Real Time Wearable Locator Device for Distress. Innovatus, 2(1), pp.54-59.
  • IEEE:
    [1] M. Navarro, N. Valdez and M. Enojas, "Real Time Wearable Locator Device for Distress", Innovatus, vol. 2, no. 1, pp. 54-59, 2019.

  • “The Philippines in Figures 2018,” vol. 63, no. 2.,
  • “Lynch, 1977 - The simple act of Touching.pdf.” retrieved:,%201977%20%20The%20simple%20act%20of%20Touching.pdf.
  • S. S. Al-zaiti, G. Pietrasik, M. G. Carey, M. Alhamaydeh, J. M. Canty, and J. A. Fallavollita, “The role of heart rate variability , heart rate turbulence , and deceleration capacity in predicting cause-specific mortality in chronic heart failure,” J. Electrocardiol., vol. 52, pp. 70–74, 2019.
  • C. Möller et al., “Epilepsy & Behavior Impact of repeated kindled seizures on heart rate rhythms , heart rate variability , and locomotor activity in rats,” Epilepsy Behav., vol. 92, pp. 36–44, 2019.
  • S. Paliwal, “Real Time Heart Rate Detection and Heart Rate Variability Calculation,” 2016 IEEE Reg. 10 Humanit. Technol. Conf., pp. 1–4.
  • R. Z. Id, A. Martínez-rodrigo, and A. Fernández-caballero, “applied sciences Estimation of Mental Distress from Photoplethysmography,” 2018.

Cited By
  • No citations found yet