Code on RPi Pico

[ebolisa]

Hi,
Testing the library code (no changes made) on a Pico board and getting pretty much a linear output.
What is possible wrong?
TIA

[n-elia]

Hi ebolisa!
First of all, let me know which is your particular board, and which is your sensor (the original Maxim, or a clone?).
Then, please try to scale the y-axis, e.g., plot the Columna B only with an y-axis ranging from 18000 to 22000.
Thank you!

[ebolisa]

Thanks for getting back to me.
I'm using the Raspberry Pi Pico and the sensor board may be a clone: https://www.pantechsolutions.net/max30102-pulse-oximeter-heart-rate-sensor-module-i2c-interface.
As for the graph, I'm using OpenOffice and I don't control it that well so I'm attaching some raw data.
data.csv

EDIT:
Updated sensor's link.

[ebolisa]

Ok, Made progress. Had a crash course on Calc.
But how do I output in a range from 0 to 100% for Oxy. And < 200 for HR?
TIA

[n-elia]

You're very welcome.

So, as I could see in your link, this is a MAX30100, so I am not sure that this library will work. However, we can further investigate. Let's check something:

1. The csv that you posted contains 26 points only. if I remember well, with the default settings, the sensor will provide 50 samples per second, therefore you should plot at least 200 samples (4 seconds) to see an heart signal that makes sense.
2. You can easily check the acquisition frequency with the code proposed in the readme; please make sure to have at least 50Hz

# Get the estimated acquisition rate
acquisition_rate = sensor.getAcquisitionFrequency()

3. How are you logging data? Is it fast enough to get all the samples?

Let me know!

[n-elia]

Nice to see that it works well!

You have to do some math to obtain SpO2 and HR. I put some hints in the last lines of the readme, here.

Please share your code if you manage to perform those computations locally, I am interested, too!

[ebolisa]

Sorry, I posted the wrong sensor's link so, I updated my post.

[ebolisa]

Will do. Thanks again.

[Abhishekcr448]

Could you please share your code on this? Because I have been trying to configure it to raspberry pi pico for the past two weeks, I am still not able to find the correct way.
I am trying it on Thonny.
I would be able to submit my project.
Also please mention steps, if you have any.

[n-elia]

Fine! Then, I'm going to close this issue.

Please feel free to open a topic in the "Discussion" section if you want to look for help for implementing HR/SPO2 evaluation, or if you want to share some progresses.

Bye,
Nicola

[Abhishekcr448]

I was looking for finding heart rate and spo2 by your given references, but I am blank. I am not able to use their code in this code.
I am not able to find a specific formula for this.
Could you please give the formula to find these by the red and IR readings, or
Could you please write a code which could find heart rate and spo2 on your module?

[n-elia]

I was looking for finding heart rate and spo2 by your given references, but I am blank. I am not able to use their code in this code. I am not able to find a specific formula for this. Could you please give the formula to find these by the red and IR readings, or Could you please write a code which could find heart rate and spo2 on your module?

Hi, I'm sorry but I have no free time to work on this. Eventually, I would be happy to include your findings into a new example script.

[n-elia]

Hi, @Abhishekcr448
I released a new version that should work with your board, without manually adding i2c.scan().
Bye,

[Darkai87]

Hello n-elia, I'm currently doing a vital signs monitor group project as part of my role in the group and was wondering how I would go about coding the MAX30102 with the raspberry pi pico to calculate heartrate and SPO2? I've been struggling for the past two to three weeks and still haven't seen any progress seen you can't import hrcalc nor numpy to code the calculations necessary to measure and display heartrate and SPO2 readings. I know the test.py you can obtain the ADC values, but I would really appreciate the help! Thanks.

[n-elia]

Hello n-elia, I'm currently doing a vital signs monitor group project as part of my role in the group and was wondering how I would go about coding the MAX30102 with the raspberry pi pico to calculate heartrate and SPO2? I've been struggling for the past two to three weeks and still haven't seen any progress seen you can't import hrcalc nor numpy to code the calculations necessary to measure and display heartrate and SPO2 readings. I know the test.py you can obtain the ADC values, but I would really appreciate the help! Thanks.

Hi, to implement a pulseoximeter with a RPi you will need:

• Raspberry Pi board
• Max30102 or MAX30105 sensor, properly connected to the i2c bus of raspberry pi
• Python library (not my library, that is for micropython), for instance this.
• A script that takes raw data from the sensor, with the proper settings, and does the math for converting to HR and SPO2 values. For instance, you can use this.

[Darkai87]

Okay yes I've acquired all those now I'm getting an error in my program for line 5 in the main.py "m = max30102.MAX30102()" and line 55 in the init module saying "self.bus = smbus.SMBus(self.channel)". I'm now wondering what the problem could be my microcontroller is the raspberry pi zero which still has all necessary libraries in order for the MAX30102 to run.

[n-elia]

Hi,
Let's do a basic check: did you enable I2C using raspi-config?
If not, try to open a terminal and run sudo raspi-config. Then, select "Interfacing options"->"I2C" choose and hit Enter, then go to Finish and reboot your raspberry.