ENGR337 Lab 2020 Spring
Lab 4 Oximeter
Name: Ryan Ford Email: rwford@fortlewis.edu
Introduction
A human pulse can be non-invaseively obtained using a device called an
oximeter. The device is placed on the tip of the finger, and
measures oxygen saturation (S02). In this lab, we will use the
fact that when the heart pulses, it pushes blood to the
fingertips. The change in blood volume creates a gradient of
translucency which can be detected with IR light. This lab will
use IR emitters and sensors to sense and plot a heartbeat.
Materials and Methods
Table 1: List of Materials
Build the circuit shown in
Lab 4 on yilectronics.com. Probe the input and output using an
oscilloscope. Plot the heartbeat using the Arduino Serial Plotter.
Results
Task 1
Figure 1: Pulse detected from the IR sensor displayed on the oscillascope
Task 2
Youtube video showing the Arduino Serial Plotter:
Discussion
The results closely resemble the expected results. The heartbeats
were obtained using the methods in this lab. Figure 1 shows a heartbeat
of about 60 bpm which is typical for an average human.
