Adding example to demo 3200Hz reading for issue #2

Author: nseidle

examples/Example1_Basic_Readings/Example1_Basic_Readings.ino

@@ -29,11 +29,11 @@ MAX30105 particleSensor;
 
 void setup()
 {
-  debug.begin(115200);
-  debug.println("Initializing...");
+  debug.begin(9600);
+  debug.println("MAX30105 Basic Readings Example");
 
   // Initialize sensor
-  if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) //Use default I2C port, 400kHz speed
+  if (particleSensor.begin() == false)
   {
     debug.println("MAX30105 was not found. Please check wiring/power. ");
     while (1);

examples/Example2_Presence_Sensing/Example2_Presence_Sensing.ino

@@ -30,11 +30,11 @@ long startTime; //Used to calculate measurement rate
 
 void setup()
 {
-  Serial.begin(115200);
-  Serial.println("Initializing...");
+  Serial.begin(9600);
+  Serial.println("MAX30105 Presence Sensing Example");
 
   // Initialize sensor
-  if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) //Use default I2C port, 400kHz speed
+  if (particleSensor.begin(Wire, I2C_SPEED_FAST) == false) //Use default I2C port, 400kHz speed
   {
     Serial.println("MAX30105 was not found. Please check wiring/power. ");
     while (1);
@@ -44,7 +44,7 @@ void setup()
   byte ledBrightness = 0xFF; //Options: 0=Off to 255=50mA
   byte sampleAverage = 4; //Options: 1, 2, 4, 8, 16, 32
   byte ledMode = 2; //Options: 1 = Red only, 2 = Red + IR, 3 = Red + IR + Green
-  byte sampleRate = 400; //Options: 50, 100, 200, 400, 800, 1000, 1600, 3200
+  int sampleRate = 400; //Options: 50, 100, 200, 400, 800, 1000, 1600, 3200
   int pulseWidth = 411; //Options: 69, 118, 215, 411
   int adcRange = 2048; //Options: 2048, 4096, 8192, 16384
 

examples/Example6_FIFO_Readings/Example6_FIFO_Readings.ino

@@ -33,13 +33,22 @@ void setup()
   Serial.println("Initializing...");
 
   // Initialize sensor
-  if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) //Use default I2C port, 400kHz speed
+  if (particleSensor.begin(Wire, I2C_SPEED_FAST) == false) //Use default I2C port, 400kHz speed
   {
     Serial.println("MAX30105 was not found. Please check wiring/power. ");
     while (1);
   }
 
-  particleSensor.setup(); //Configure sensor. Use 6.4mA for LED drive
+  //Setup to sense up to 18 inches, max LED brightness
+  byte ledBrightness = 0xFF; //Options: 0=Off to 255=50mA
+  byte sampleAverage = 4; //Options: 1, 2, 4, 8, 16, 32
+  byte ledMode = 2; //Options: 1 = Red only, 2 = Red + IR, 3 = Red + IR + Green
+  int sampleRate = 400; //Options: 50, 100, 200, 400, 800, 1000, 1600, 3200
+  int pulseWidth = 411; //Options: 69, 118, 215, 411
+  int adcRange = 2048; //Options: 2048, 4096, 8192, 16384
+
+  particleSensor.setup(ledBrightness, sampleAverage, ledMode, sampleRate, pulseWidth, adcRange); //Configure sensor with these settings
+//  particleSensor.setup(); //Configure sensor. Use 6.4mA for LED drive
 
   startTime = millis();
 }

examples/Example9_RateTesting/Example9_RateTesting.ino

@@ -0,0 +1,92 @@
+/*
+  MAX30105 Breakout: Take readings from the FIFO
+  By: Nathan Seidle @ SparkFun Electronics
+  Date: April 8th, 2018
+  https://github.com/sparkfun/MAX30105_Breakout
+
+  Push the MAX30105 as fast as it will go!
+
+  We used a Teensy 3.2 for testing. This will configure the MAX3010x and
+  output at approximately 3200Hz.
+
+  On an Uno the fastest we can read is 2700Hz.
+
+  Setting required:
+  Sample average has a direct impact on max read amount. Set to 1 for max speed.
+  The pulsewidth must be as short as possible. Set to 69.
+  ledMode must be 1 for 3200Hz. If ledMode is set to 2 max is 1600Hz.
+  Run at 400kHz I2C communication speed.
+  Print serial at 115200.
+
+  Any serial printing will slow the reading of data and may cause the FIFO to overflow.
+  Keep your prints small.
+
+  Hardware Connections (Breakoutboard to Arduino):
+  -5V = 5V (3.3V is allowed)
+  -GND = GND
+  -SDA = A4 (or SDA) - Pin 18 on Teensy
+  -SCL = A5 (or SCL) - Pin 19 on Teensy
+  -INT = Not connected
+
+  The MAX30105 Breakout can handle 5V or 3.3V I2C logic. We recommend powering the board with 5V
+  but it will also run at 3.3V.
+
+  This code is released under the [MIT License](http://opensource.org/licenses/MIT).
+*/
+
+#include <Wire.h>
+#include "MAX30105.h"
+
+MAX30105 particleSensor;
+
+void setup()
+{
+  Serial.begin(115200);
+  while(!Serial); //We must wait for Teensy to come online
+  Serial.println("Max sample rate example");
+
+  // Initialize sensor
+  if (particleSensor.begin(Wire, I2C_SPEED_FAST) == false) //Use default I2C port, 400kHz speed
+  {
+    Serial.println("MAX30105 was not found. Please check wiring/power. ");
+    while (1);
+  }
+
+  //Setup to sense up to 18 inches, max LED brightness
+  byte ledBrightness = 0xFF; //Options: 0=Off to 255=50mA
+  byte sampleAverage = 1; //Options: 1, 2, 4, 8, 16, 32
+  byte ledMode = 1; //Options: 1 = Red only, 2 = Red + IR, 3 = Red + IR + Green
+  int sampleRate = 3200; //Options: 50, 100, 200, 400, 800, 1000, 1600, 3200
+  int pulseWidth = 69; //Options: 69, 118, 215, 411
+  int adcRange = 16384; //Options: 2048, 4096, 8192, 16384
+
+  particleSensor.setup(ledBrightness, sampleAverage, ledMode, sampleRate, pulseWidth, adcRange); //Configure sensor with these settings
+}
+
+void loop()
+{
+  byte samplesTaken = 0;
+  long startTime = micros();
+
+  while(samplesTaken < 10)
+  {
+    particleSensor.check(); //Check the sensor, read up to 3 samples
+    while (particleSensor.available()) //do we have new data?
+    {
+      samplesTaken++;
+      particleSensor.getFIFOIR();
+      particleSensor.nextSample(); //We're finished with this sample so move to next sample
+    }
+  }
+
+  long endTime = micros();
+
+  Serial.print("samples[");
+  Serial.print(samplesTaken);
+
+  Serial.print("] Hz[");
+  Serial.print((float)samplesTaken / ((endTime - startTime) / 1000000.0), 2);
+  Serial.print("]");
+
+  Serial.println();
+}

src/MAX30105.cpp

@@ -160,7 +160,7 @@ boolean MAX30105::begin(TwoWire &wirePort, uint32_t i2cSpeed, uint8_t i2caddr) {
 
   _i2caddr = i2caddr;
 
-  // Step 1: Initial Communciation and Verification
+  // Step 1: Initial Communication and Verification
   // Check that a MAX30105 is connected
   if (!readPartID() == MAX_30105_EXPECTEDPARTID) {
     // Error -- Part ID read from MAX30105 does not match expected part ID.