DIY Blood Oxygen Meter

In 2020, the world faced an invisible monster named Corona Virus. This Virus made people very sick & weak. Many people lost their good ones.

There was a big problem initially, the problem was the unavailability of proper medical equipment like the monitors to check the blood oxygen levels, ventilators & disinfectants. In this hour of need, we felt that we could help everyone to teach them how to make a DIY Blood Oxygen Meter. This Instructable is dedicated to the soldiers, Doctors & all government officials who helped us throughout 2020.

Step 1: Gather the Material

All the material mentioned here is easily available in your local market as well as online stores.

1. Esp32 Wroom 32D
2. Max 30102 Oximeter Sensor
3. BreadBoard
4. Jumper Cables
5. Blynk App in smartphone

Step 2: Introduction

This is a DIY project to create a homemade solution for monitoring the blood oxygen level of an individual. The cost of this project is less than 15$.

The main component of this project is:

Max30102 Oximeter Sensor: The MAX30102 is an integrated pulse oximeter and heart rate monitor biosensor module. It integrates a red LED and an infrared LED, photodetector, optical components, and low-noise electronic circuitry with ambient light suppression. - The MAX30102 features a 1.8V power supply and a separate 5.0V power supply for internal LEDs for heart rate and blood oxygen acquisition in wearable devices, worn on the fingers, earlobe, and wrist.

We will be connecting our sensor with the ESP32 board to take inputs & show the monitored oxygen level in Blynk app on our smartphone.

Step 3: Making the Connections

There are few connections only, viz; (Refer to the connections from the circuit image)

1. Connect GND of ESP board to GND of Max30102 sensor.
2. Connect 3v3 of ESP board to Vin of Max30102 sensor.
3. Connect Pin 22 of ESP board to SDA of Max30102 sensor.
4. Connect Pin 21 of ESP board to SCL of Max30102 sensor.

Once the connection is complete we can move to set up the Blynk project.

Step 4: Setting Up the Project in Blynk

You need to install the Blynk app on your smartphone. Create one account or login if already created.

Follow the steps:

1. Create a new project & give it a name.
2. Select board as ESP32 developer board.
3. Now add two widgets; Gauge & Labeled Value.
4. Edit the Gauge setting: Change the Pin as Virtual V4 & value from 0 to 100.
5. Edit the Labeled value: Change the label as "Blood Oxygen %".

Step 5: Let's Code It

The code attached here is complete. You just need to make some changes according to your "Blynk Auth Token" & Wifi Settings. Upload it with Arduino IDE.

Comments

[g.romanov.69]

Recently made the same compact device.

[bg8eqb]

Can you share your schematic and source code?

[Random Stuff We Make]

It's really amazing. Thanks for helping.

[Kuzanashvili]

what about calibration? How to calibrate or check if the values are correct

[Saidheeraj]

I have connected everything as shown. Still my sensor isn't turning on. Also blynk app is getting disconnected immediately.

[Random Stuff We Make]

Can you share any image of your circuit & blynk configuration?

[mxke111]

I have tried out this project including the heart rate sensor of the MAX30102. It works perfectly on its own. However, the heart rate values do not show up as soon as I connect it to the Blynk app. Might you know how to solve this issue?

[Ohms Lab]

Now we can beat Covid in home!

[Sporkpork2006]

I have only done a few arduino projects and no wireless IOT projects so I can't figure out this error that keeps pulling up. I have been on multiple forums looking at similar things. Can someone help me solve 'red' has not been declared.

[Random Stuff We Make]

There is a space after red and before the comma(,)in the highlighted line.
Remove that. If that doesn't help, try adding it on the very top of your code :

uint32_t red;

[Sporkpork2006]

Like I said I am a beginner and I just did that but now it says 'red' is not a type. Could you help me on this.

[Random Stuff We Make]

Can you send the code?
Please mail to [e-mail]

[LarryP42]

Where is the power supply (battery)? Thanks!

[Random Stuff We Make]

It's powered up by USB. You can also add one power bank to power it.

[carltonwb]

Is there a 3d printable case for this. I just made 25 for my medical staff and thought there might be a case in the ethos for this.
BTW it is pretty accurate vs the $100 ones my team carries

[Random Stuff We Make]

Hello Carltonwb, First of all, thank you for helping others in this hour of need. We currently don't have any 3D print case available. But we can make one for you. Please send us a picture of your setup & we will provide you with the case.
Email: [e-mail]
Whatsapp: [phone]

[Random Stuff We Make]

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