Unable to print SPO2 and HR via serial connection

[jaredwong92]

I am integrating MAX30102 with Arduino without Adafruit's Feather M0 Adalogger. Although I changed the output to Serial port (at baud rate 115200), the SPO2 and HR numbers are zero. Below is the example of the output from Serial pot. I had attached the code as well.

Start calculate heart rate --RF-- 529 0.00 0 0:8:49

Start calculate heart rate --RF-- 530 0.00 0 0:8:50

RD117_ARDUINO_new1.zip

[aromring]

Well, no wonder the SpO2 and HR numbers are zero: in your code you have commented out rf_heart_rate_and_oxygen_saturation() - the very routine that does all the signal processing! Here, try this code and let me know of the outcome. Please copy and paste full output in the Serial monitor.

RD117_ARDUINO_new2.zip

[jaredwong92]

Previously I tried to use the rf_heart_rate_and_oxygen_saturation() routine but it will not run pass that routine. That is why I commented out. Below is the full output in the Serial Monitor

Vbatt= 1.62 blink LED Initialise MAX30102 Start calculate heart rate Vbatt= 0.19 blink LED Initialise MAX30102 Start calculate heart rate

[aromring]

All right, it's time to see the raw data coming from the sensor. I need it to debug this issue. Please run the attached code and report full output in the Serial monitor.

RD117_ARDUINO_new3.zip

[jaredwong92]

This is the full output in the Serial monitor. output.txt

[aromring]

Ah, we are getting somewhere. It looks like your microcontroller is reaching rf_heart_rate_and_oxygen_saturation(), can't handle it, then quits and restarts. This is why it runs setup() repetitively. My guess is that it runs out of memory. Thus: what microcontroller do you use? When you compile the code (with Arduino IDE, I presume) you get the report of memory usage: what does it say about % memory used by code and data, respectively?

Adalogger's Cortex M0 microcontroller has enough memory and computational power to handle my algorithm. Yours may not...

[boblongoria]

I admire your heart or service for the rookie problems of jaredwong92. I will attempt to learn from his mistakes and also benefit from your analisis. Regards, Bob

[jaredwong92]

I am using ATmega32U4. You are right that the memory usage is very high. Sketch uses 15160 bytes (46%) of program storage space. Maximum is 32256 bytes. Global variables use 1902 bytes (92%) of dynamic memory, leaving 146 bytes for local variables. Maximum is 2048 bytes. Low memory available, stability problems may occur. Guess I need to use another algorithm to get the HR and SPO2

[aromring]

Jared, I suggest a better MCU; apparently ATmega32U4 is insufficient. Unless you have other issues I consider this issue to be closed.