RAPPAHANNOCK COMMUNITY COLLEGE STEM CAMP
  • Home
  • 2021 STEM Camp (HS)
    • PreAcademy prep
    • Day 1: Basics, Lights, and Temperature Sensor >
      • Day 1 Supplement: Measure Temperature
      • Day 1 Supplement: IR Temp Sensor
      • Day 1 Supplement: Identifying Resistors
      • Supplement: Controlling Buttons
      • Supplement: Controlling A Servo
    • Day 2: Measuring Pulse >
      • How the body absorbs light
      • Day 2 Supplement: IR Light Proximity Sensor
      • Day 2 Supplement: Motion Sensor
      • Code to start later on plotter
    • Day 3 Supplement: OLED Screen Basics >
      • Display Screen Temperature
      • IR Temp Sensor And Screen
      • Scrolling Screen Graph
    • Day 4: Finishing up/Show >
      • Pictures to OLED
      • BPM Pulse Sensor
      • Multimeter
  • Shared Google Folder
  • The Teachers
  • Archive
    • Pictures from prior years
    • 2021 STEM Camp (MS) >
      • Home (2021)
      • PreAcademy prep
      • Day 1: Basics, Lights, and Temperature Sensor >
        • Day 1 Supplement: Identifying Resistors
        • Day 1 Supplement: Measure Temperature
        • Day 1 Supplement: IR Light Proximity Sensor
      • Day 2: Ultrasound >
        • Day 2 Supplement: IR Temp Sensor
        • Day 2 Supplement: Controlling A Servo
      • Day 3: Measuring Pulse >
        • Day 3 Supplement: Motion Sensor
      • Day 4: OLED Screen Basics >
        • Temperature Screen Display
        • IR Temp Sensor And Screen
      • Day 5 Friday: Finishing up/Show
    • 2020 STEM Camp >
      • Home (2020)
      • The 2020 Teachers
      • PreAcademy prep
      • Day 1 Monday: Basics and Lights >
        • Day 1 Supplement Activity
      • Day 2 Tuesday: Servos >
        • Day 2 (Suppliment Activities)
      • Day 3 Wednesday: Making an ECG/EKG! >
        • Day 3 (Supplement Page)
      • Day 4 Thursday: Controlling Servos with EMG >
        • Day 4 Supplemental Activity
      • Day 5 Friday: Finishing up/Show >
        • Unused lessons/content
    • 2018 Lessons >
      • Day 1: Basic Coding
      • Day 2: Motors
      • Day 3: Build Robot Claw
      • Day 4: Saving Positions
      • Day 5: Presentations
    • 2017 Camp >
      • Day 1 (Monday)
      • Day 2: Multicolor LED and Keypad
      • Day 3: Servo and Keypad
      • Day 4: Multiple Motors/Stepper Motor
      • Day 5: Presentations
    • Pictures archive for lessons (some graphic images)
  • Contact Us!

Day 3 Supplement:
​Pulse Oximeter 


Disclaimer: The Oximeter you make for this activity should not be used for diagnostic purposes. If at any point you are concerned about your heart rhythm or SpO2 readings, you should consult your physician.


What you need for today's activities


The Arduino and Cord
Picture
Several Different LEDs
Picture
All the Resistor Strips
Picture
The Pulse Sensor​
Picture
Wires
Picture

What is a Pulse Oximeter?

This device checks how well your heart is pumping oxygen through your body.

Oximeters measure oxygen saturation
(SpO2). This represents the extent to which hemoglobin is saturated with oxygen. Hemoglobin is protein in red blood cells (RBCs) that binds with oxygen to carry it from your lungs to the tissues of your body.

Here is a link to more info on Hemoglobin. 
Picture
It may be used to monitor conditions that can affect blood oxygen levels.
Some of these conditions include: 
  • chronic obstructive pulmonary disease (COPD)
  • asthma
  • pneumonia
  • lung cancer
  • collapsed lung
  • pulmonary embolism
  • anemia
  • heart attack or heart failure
  • Sleep apnea
  • congenital heart defects
    (You can click on each of these to learn more) 

The Visible Color Spectrum

White light is a mix of all primary colors (ROYGBV). Remember prisms from elementary school? See below for how Red, Orange, Yellow, Green, Blue, and Violet (ROYGBV) can be separated from white light! Important point:  Violet does not mean purple. It is the "roses are red, violets are blue" color. 
Picture
Wild Violet Flower
Picture
Picture source: ​http://blogs.nature.com/ofschemesandmemes/files/2015/02/Week-2-Blog-Dispersive-Prism.jpg

ROYGBV is just the visible light wavelengths! 

Picture

​Your Body's Light Penetration

You can see red light penetrate through your finger if you put it in front of a flashlight. You see red on the other side because most of the other colors were absorbed in your finger. Try this at home! Put your phone flashlight, or any white flashlight, on one side of your finger. Then look at what color makes it to the other side! 
Picture
Picture
www.researchgate.net/publication/316712743/figure/fig13/AS:668385360744448@1536366896067/a-Tissue-penetration-depth-of-light-with-different-wavelengths-NIR-light-penetrates.png
Picture
https://images.theconversation.com/files/201297/original/file-20180109-83559-19kt3yi.png?ixlib=rb-1.1.0&q=45&auto=format&w=754&fit=clip

Red light can be used to see inside your body. 

Well, somethings not right with this finger. Got an x-ray and yep, something is there.
Picture
Picture
All images below are sourced from: ​http://www.eatonhand.com/img/img00087.htm
Let's shine red light on it. Yep, it's darker where something is sitting. That means there is not good blood flow there, so there is more deoxygenated blood in that spot.  
Picture
Click here to see what was taken out after surgery. Warning: somewhat graphic image. 
Link to post surgery picture.

Seeing your Heartbeat with Light! 

The color of blood

Have you ever heard that blood gets darker if it does not have oxygen in it? Well, that's true. The more oxygen blood has, the more deep red light it absorbs so it reflects less deep red. 
Picture
All sketches for this section come from this source: ​https://www.youtube.com/watch?v=MHPgamGQmDY

Picture
Picture

Graphing blood's light absorption by wavelength

This is a rough sketch showing how much hemoglobin (Hb) absorbs different light wavelengths  depending on if it is oxygenated.  

Red light at a 660 nm wavelength is used in pulse oximeters. This is because it is the max difference between light absorbance.
Picture

Video Lesson about Blood Oxygen

Please watch this video about how the Pulse Ox works. 

Code and directions under development

The inspiration for the SpO2 sensor activity.

https://www.youtube.com/watch?v=cEtyMkubXj4
lesson:

https://surtrtech.com/2019/02/05/measure-heart-pulses-bpm-and-oxygen-saturation-spo%c2%b2-with-max30102-and-arduino/
Code: 
 MAX30102- Heart Rate Pulse Detection-Module  https://electropeak.com/learn/
https://electropeak.com/learn/interfacing-max30102-pulse-oximeter-heart-rate-module-with-arduino/
Powered by Create your own unique website with customizable templates.
  • Home
  • 2021 STEM Camp (HS)
    • PreAcademy prep
    • Day 1: Basics, Lights, and Temperature Sensor >
      • Day 1 Supplement: Measure Temperature
      • Day 1 Supplement: IR Temp Sensor
      • Day 1 Supplement: Identifying Resistors
      • Supplement: Controlling Buttons
      • Supplement: Controlling A Servo
    • Day 2: Measuring Pulse >
      • How the body absorbs light
      • Day 2 Supplement: IR Light Proximity Sensor
      • Day 2 Supplement: Motion Sensor
      • Code to start later on plotter
    • Day 3 Supplement: OLED Screen Basics >
      • Display Screen Temperature
      • IR Temp Sensor And Screen
      • Scrolling Screen Graph
    • Day 4: Finishing up/Show >
      • Pictures to OLED
      • BPM Pulse Sensor
      • Multimeter
  • Shared Google Folder
  • The Teachers
  • Archive
    • Pictures from prior years
    • 2021 STEM Camp (MS) >
      • Home (2021)
      • PreAcademy prep
      • Day 1: Basics, Lights, and Temperature Sensor >
        • Day 1 Supplement: Identifying Resistors
        • Day 1 Supplement: Measure Temperature
        • Day 1 Supplement: IR Light Proximity Sensor
      • Day 2: Ultrasound >
        • Day 2 Supplement: IR Temp Sensor
        • Day 2 Supplement: Controlling A Servo
      • Day 3: Measuring Pulse >
        • Day 3 Supplement: Motion Sensor
      • Day 4: OLED Screen Basics >
        • Temperature Screen Display
        • IR Temp Sensor And Screen
      • Day 5 Friday: Finishing up/Show
    • 2020 STEM Camp >
      • Home (2020)
      • The 2020 Teachers
      • PreAcademy prep
      • Day 1 Monday: Basics and Lights >
        • Day 1 Supplement Activity
      • Day 2 Tuesday: Servos >
        • Day 2 (Suppliment Activities)
      • Day 3 Wednesday: Making an ECG/EKG! >
        • Day 3 (Supplement Page)
      • Day 4 Thursday: Controlling Servos with EMG >
        • Day 4 Supplemental Activity
      • Day 5 Friday: Finishing up/Show >
        • Unused lessons/content
    • 2018 Lessons >
      • Day 1: Basic Coding
      • Day 2: Motors
      • Day 3: Build Robot Claw
      • Day 4: Saving Positions
      • Day 5: Presentations
    • 2017 Camp >
      • Day 1 (Monday)
      • Day 2: Multicolor LED and Keypad
      • Day 3: Servo and Keypad
      • Day 4: Multiple Motors/Stepper Motor
      • Day 5: Presentations
    • Pictures archive for lessons (some graphic images)
  • Contact Us!