In the file "MAX30105.cpp" in the function "readRegister8()" there is a delay with a timeout after the Wire.requestFrom(). There is no need to wait there.
The Wire.requestFrom() waits until the i2c session has completely finished. After that the data is in a buffer inside the Wire library. The Wire.available() returns the number of bytes that are in that buffer. There is no need to wait for retrieving data from that buffer, since the i2c session has already finished.

I did not check the datasheet. Some sensors do not acknowledge their i2c address when they are busy. In that case the Wire.requestFrom() should be repeated.
The Wire.available() could be used once, or the return value of Wire.requestFrom() could be used to check if no data was received and a fail (zero) should be returned.

Great library. Thanks for making it available to us.

Is there a way to add functions to the heartBeat.h to read out the trough, peak and potentially a trigger for the 2nd beat; i.e. the Diastole peak?

I looked at the code but was not sure if the IR_AC_Signal_max and IR_AC_Signal_min are peak and trough values.

thx.

Hi, i found that sampleRate could be more than 255, but the data type of sampleRate is byte, maybe short or int is more proper.

When I try to upload the code to a Arduino Pro Mini I am receiving this error:

Example8_SPO2:96: error: cannot convert 'uint16_t* {aka unsigned int*}' to 'uint32_t* {aka long unsigned int*}' for argument '1' to 'void maxim_heart_rate_and_oxygen_saturation(uint32_t*, int32_t, uint32_t*, int32_t*, int8_t*, int32_t*, int8_t*)'

maxim_heart_rate_and_oxygen_saturation(irBuffer, bufferLength, redBuffer, &spo2, &validSPO2, &heartRate, &validHeartRate);

Is there a fix for this?

Would like to use this as a smoke detector for my 3d printer but there is no example on how to do this?

1. Vreg (U1) sill has "BP" pin, should be updated to "NC"

2. Typo in SCH:

3. Have you verified that the BOM in Sparkle is accurate (also checking for PROD_ID, NAME, VALUE, PREFIX)? [NO]
   comment: incorrect in sparkle, QTY of caps and resistors seems to be swapped

4. Does this board adhere to the standard manufacturing process? (Kitting time, glue curing, humidor time, etc.) [NO]
   comment: still need to confirm about washing sensativity