Esp32

examples/Example5_fast_print/Example5_fast_print.ino

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+/*
+ This example displays a more manual method of adjusting the way in which the
+ MAX30101 gathers data. Specifically we'll look at how to modify the pulse
+ length of the LEDs within the MAX30101 which impacts the number of samples 
+ that can be gathered, so we'll adjust this value as well. In addition we 
+ gather additional data from the bioData type: LED samples. This data gives 
+ the number of samples gathered by the MAX30101 for both the red and IR LEDs. 
+ As a side note you can also choose MODE_ONE and MODE_TWO for configSensorBpm
+ as well.
+ A summary of the hardware connections are as follows: 
+ SDA -> SDA
+ SCL -> SCL
+ RESET -> PIN 4
+ MFIO -> PIN 5
+
+ Author: Elias Santistevan
+ Date: 8/2019
+ SparkFun Electronics
+
+ If you run into an error code check the following table to help diagnose your
+ problem: 
+ 1 = Unavailable Command
+ 2 = Unavailable Function
+ 3 = Data Format Error
+ 4 = Input Value Error
+ 5 = Try Again
+ 255 = Error Unknown
+*/
+
+#include <SparkFun_Bio_Sensor_Hub_Library.h>
+#include <Wire.h>
+
+// Reset pin, MFIO pin
+int resPin = 32;
+int mfioPin = 5;
+
+// Possible widths: 69, 118, 215, 411us
+int width = 411; 
+// Possible samples: 50, 100, 200, 400, 800, 1000, 1600, 3200 samples/second
+// Not every sample amount is possible with every width; check out our hookup
+// guide for more information.
+int samples = 100; 
+int pulseWidthVal;
+int sampleVal;
+
+// Takes address, reset pin, and MFIO pin.
+SparkFun_Bio_Sensor_Hub bioHub(resPin, mfioPin); 
+
+bioData body; 
+// ^^^^^^^^^
+// What's this!? This is a type (like "int", "byte", "long") unique to the SparkFun
+// Pulse Oximeter and Heart Rate Monitor. Unlike those other types it holds
+// specific information on the LED count values of the sensor and ALSO the
+// biometric data: heart rate, oxygen levels, and confidence. "bioLedData" is 
+// actually a specific kind of type, known as a "struct". I chose the name
+// "body" but you could use another variable name like "blood", "readings",
+// "ledBody" or whatever. Using the variable in the following way gives the
+// following data: 
+// body.irLed      - Infrared LED counts. 
+// body.redLed     - Red LED counts. 
+// body.heartrate  - Heartrate
+// body.confidence - Confidence in the heartrate value
+// body.oxygen     - Blood oxygen level
+// body.status     - Has a finger been sensed?
+
+void setup(){
+
+  Serial.begin(115200);
+
+  #ifdef ARDUINO_ESP32_DEV
+    delay(2000);//delay for printing after reset
+    Serial.println("ARDUINO_ESP32_DEV");
+  #endif
+
+  Wire.begin(21,22,400000);
+  int result = bioHub.begin();
+  if (result == 0) // Zero errors!
+    Serial.println("Sensor started!");
+
+  Serial.println("Configuring Sensor...."); 
+  int error = bioHub.configSensorBpm(MODE_ONE); // Configure Sensor and BPM mode , MODE_TWO also available
+  if (error == 0){// Zero errors.
+    Serial.println("Sensor configured.");
+  }
+  else {
+    Serial.println("Error configuring sensor.");
+    Serial.print("Error: "); 
+    Serial.println(error); 
+  }
+
+  // Set pulse width.
+  error = bioHub.setPulseWidth(width);
+  if (error == 0){// Zero errors.
+    Serial.println("Pulse Width Set.");
+  }
+  else {
+    Serial.println("Could not set Pulse Width.");
+    Serial.print("Error: "); 
+    Serial.println(error); 
+  }
+
+  // Check that the pulse width was set. 
+  pulseWidthVal = bioHub.readPulseWidth();
+  Serial.print("Pulse Width: ");
+  Serial.println(pulseWidthVal);
+
+  // Set sample rate per second. Remember that not every sample rate is
+  // available with every pulse width. Check hookup guide for more information.  
+  error = bioHub.setSampleRate(samples);
+  if (error == 0){// Zero errors.
+    Serial.println("Sample Rate Set.");
+  }
+  else {
+    Serial.println("Could not set Sample Rate!");
+    Serial.print("Error: "); 
+    Serial.println(error); 
+  }
+
+ // bioHub.set_report_period(100);
+
+
+  // Check sample rate.
+  sampleVal = bioHub.readSampleRate();
+  Serial.print("Sample rate is set to: ");
+  Serial.println(sampleVal); 
+
+  // Data lags a bit behind the sensor, if you're finger is on the sensor when
+  // it's being configured this delay will give some time for the data to catch
+  // up. 
+//  Serial.println("Loading up the buffer with data....");
+//  delay(4000);
+
+}
+
+void loop(){
+
+  uint16_t t = millis();
+  static uint16_t  t_old = 0;
+  int16_t t_diff;
+
+    // Information from the readSensor function will be saved to our "body"
+    // variable.  
+
+    uint8_t samples = bioHub.numSamplesOutFifo();       
+
+    //read all samples in fifo and use most recent one
+     while(samples){
+       body = bioHub.readSensorBpm();
+       samples--;
+    }
+
+
+    t_diff = t - t_old;  
+    if(t_diff>=500){     
+      t_old += 500;
+
+//      Serial.print(samples); 
+//      Serial.print(","); 
+      Serial.print(body.heartRate); 
+      Serial.print(","); 
+      Serial.println(body.oxygen); 
+
+      samples = bioHub.numSamplesOutFifo();          
+    }
+
+    //clear fifo before delay
+    while(samples){
+       body = bioHub.readSensorBpm();
+       samples--;
+    }
+
+
+
+    delay(10); 
+}