Arduino Nano: MAX30102 and memory problems

Question

We are making a simple pulse oximeter device with an Arduino Nano and a MAX30102 sensor.

The problem is the SpO₂ reading and processing algorithm of the MAX30102 library literally does signal processing on the Arduino with large arrays of data and because of that, when you do BPM and SpO₂, the 2kb memory of the Arduino is already full.

Can you guys give me some advice to overcome this problem?

• timemage: If you mean large lookup tables / reference data, you should say, because that's definitely something worth knowing. More details in any case.
• Dave Newton: Are you saying it doesn't work with just that library, or are you saying there are other libraries also that make it not work (like an OLED library)?
• Recep uludağ: I meant the arrays that saves data. It takes 4 second of data and process it. That beginning data alone takes 400 bytes of 2k. And it hits %90 of 2kb at spo2,bpm and oled but i still need to add bluetooth.
• user85471: Which specific library? The linked datasheet does not make any reference to a library.

Answer 1

Arduino UNO is not recommended for MAX30102 as it requires a lot of processing and RAM. Consider shifting to Arduino Mega or the ESP32.

• timemage: In the question they acknowledge the library they're using uses a lot of ram. I think the question is how do they do it on their hardware despite that. If it's fundamentally not doable in less ram, then explaining that might be useful.