MAX30100 only works on R4 and not R3?

[cweckherlin]

Hi there!

I've recently got a heart rate sensor by M5Stack. It works fine on my Arduino R4. I then wanted to add NeoPixel LEDs to my board but I realised after researching this forum, that NeoPixel isn't yet supported for R4. So I bought myself a R3. The NeoPixels work perfectly now, but my Heart Rate sensor doesn't on the R3...

I've tested out I2C Scanners and they seem to break? Here an example:

Same when trying out the Heart Rate script (works on R4, exactly as shown here) - it gets disrupted or something?

Thank you for your help!

[cweckherlin]

Maybe it‘s easier to reverse the problem and try to get the NeoPixel to work on the R4 - since the heart rate works on this one? Did anyone find a solution for that yet?

[liaifat85]

Please check if there has been a baud rate mismatch by any chance.

[david_2018]

Can you use FastLED instead of Adafruit_NeoPixel?

[cweckherlin]

I have, and I am using the rate defined in the code

[cweckherlin]

FastLED says that the platform isn‘t supported (on the r4). I will post the exact message later, I‘m not at home rn

[david_2018]

@cweckherlin

FastLED says that the platform isn‘t supported (on the r4).

Which version of FastLED are you using? I get no error or warning messages with version 3.6.0. You may need to download the latest version from the github page.

[cweckherlin]

I've tried downloading the latest version directly from GitHub. I don't get an error anymore, but it only lights up the first LED in the matrix. I've measured the voltage and it should be fine. Do you have an example?

[cweckherlin]

I've run the following i2cdetect sketch and the sensor seems to be recognized:

But I still don't get any output, also the LED on the heart rate sensor isn't working.

Any inputs?