SparkFun Pulse Oximeter and Heart Rate Monitor Hookup Guide
Example 2: Config BPM Mode 2
As opposed to Example 1, In Example 2's setup, we give the argument MODE_TWO
to bioHub.configBPM()
to get more information from the SparkFun Pulse Oximeter and Heart Rate Monitor. Specifically we'll get an extended finger status and the R value of the blood oxygen data.
Serial.println("Configuring Sensor...."); int error = bioHub.configBpm(MODE_TWO); // Configuring just the BPM settings. if(!error){ Serial.println("Sensor configured."); } else { Serial.println("Error configuring sensor."); Serial.print("Error: "); Serial.println(error); }
Simple right? Nothing else changes except that when we pull the data we now have access to more data: body.extStatus
and body.rValue
.
void loop(){ // Information from the readBpm function will be saved to our "body" // variable. body = bioHub.readBpm(); Serial.print("Heartrate: "); Serial.println(body.heartRate); Serial.print("Confidence: "); Serial.println(body.confidence); Serial.print("Oxygen: "); Serial.println(body.oxygen); Serial.print("Status: "); Serial.println(body.status); Serial.print("Extended Status: "); Serial.println(body.extStatus); Serial.print("Blood Oxygen R value: "); Serial.println(body.rValue); delay(250); // Slowing it down, we don't need to break our necks here. }
Check the reference table above under Finger Status for more information on what each number means, there are eight. The R value refers to a correlation coefficient used to determine a statistical relationship between two variables: blood oxygen and a optical plate placed over the sensor. This does not refer to the glass shield on the sensor but rather a shield that would be placed over the sensor if you decided to implement this into a final product. In other words the company that manufactures this IC, Maxim Integrated has given the user a way to get faster FDA approval when using this IC in a final product. You can read more about that here. For those of us just tinkering in a project it has no Real value. Get it?