Pulse-detection: Other Examples

While searching the internet for similar projects I ran into a couple of similar projects. The first one I found was a patent 5810736_Wrist_pulse_monitor on a wrist pulse measurement device. The device looks like a watch and picks up pulses through a special mechanism. It uses phototransistors a nd an IR light to detect the changes in wavelength of the light reflected. The light bounced off the wrist and based on the variations in light wavelengths it would count the pulses. This method is useful, however when it comes to building a similar mechanism the cahnces are the changes in the light would be too minute to be sensed by low-cost mechanisms. The second website I came across was a project for a non-invasive blood pressure sensor. This website used the delay between the wrist pulse and the elbow pulse to detect the blood pressure. The pulse was sensed by a piezo electric monitor annd amplified by two LM396 ICs and a low pass filter to remove the 50HZ noise produced by our modern electric devices. This method seems more feasible than using IR variations to monitor pulse.

First meeting with supervisor

Today I met my supervisor for my personal project about the pulse meter. I discussed with her my aim, guiding question and product. We discussed what I was going to do over the summer. Over the summer I am to develop a rudimentary device that I can use to collect the pulse and study correlations between various things. I am also to complete background research so that when I come back from holiday I am ready to go fully into the study of correlations. I will also finish the specifications by the end of the holidays. The next meeting with my supervisor will be on the week of 5th august.

Things to be completed over the summer (June 14th-September 14th):

  1. Build a rudimentary device that can be used for researching and recording pulse and correlations between the pulse and other factors.
  2. Complete most background research.
  3. Come up with a rough specifications draft.


The aim of this project is to develop a device capable of deducing trends purely from the wrist pulse. This technology was used in ancient Asia. Doctors used to put their hand on the wrist and produce prescriptions for the patients. Now a days pulse is only measured in beats per minute however, the ancient Indians used to study not only the number of pulses but what the pulses felt like and how steady the pulse was. This is what I am going to study. I will collect pulses over a period of a couple of months and study these.