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Merge pull request #182 from WorldFamousElectronics/joel-m-branch-1
Support for Arduino DUE
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| /* | ||
| Code to detect pulses from the PulseSensor, | ||
| using an interrupt service routine. | ||
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| Here is a link to the tutorial\ | ||
| https://pulsesensor.com/pages/getting-advanced | ||
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| Copyright World Famous Electronics LLC - see LICENSE | ||
| Contributors: | ||
| Joel Murphy, https://pulsesensor.com | ||
| Yury Gitman, https://pulsesensor.com | ||
| Bradford Needham, @bneedhamia, https://bluepapertech.com | ||
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| Licensed under the MIT License, a copy of which | ||
| should have been included with this software. | ||
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| This software is not intended for medical use. | ||
| */ | ||
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| /* | ||
| Include the DueTimer library. If you don't have it, use library manager to get it. | ||
| You can also find it at https://github.com/ivanseidel/DueTimer | ||
| If you use the Servo library, probably want to include that before this inlude. Just sayin'... | ||
| This will grab the next available timer and call it sampleTimer for use throughout the code | ||
| */ | ||
| #include <DueTimer.h> | ||
| DueTimer sampleTimer = Timer.getAvailable(); | ||
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| /* | ||
| Every Sketch that uses the PulseSensor Playground must | ||
| define USE_ARDUINO_INTERRUPTS before including PulseSensorPlayground.h. | ||
| Here, #define USE_ARDUINO_INTERRUPTS true tells the library to use | ||
| interrupts to automatically read and process PulseSensor data. | ||
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| See PulseSensor_BPM_Alternative.ino for an example of not using interrupts. | ||
| */ | ||
| #define USE_ARDUINO_INTERRUPTS true | ||
| #include <PulseSensorPlayground.h> | ||
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| /* | ||
| * Declare the interrupt service routine | ||
| * This will be used in setup as the interrupt callback in attachInterrupt | ||
| */ | ||
| void sampleTimer_ISR(){ | ||
| PulseSensorPlayground::OurThis->onSampleTime(); | ||
| } | ||
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| /* | ||
| The format of our output. | ||
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| Set this to PROCESSING_VISUALIZER if you're going to run | ||
| the Processing Visualizer Sketch. | ||
| See https://github.com/WorldFamousElectronics/PulseSensor_Amped_Processing_Visualizer | ||
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| Set this to SERIAL_PLOTTER if you're going to run | ||
| the Arduino IDE's Serial Plotter. | ||
| */ | ||
| const int OUTPUT_TYPE = SERIAL_PLOTTER; | ||
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| /* | ||
| Pinout: | ||
| PULSE_INPUT = Analog Input. Connected to the pulse sensor | ||
| purple (signal) wire. | ||
| PULSE_BLINK = digital Output. Connected to an LED (and 1K series resistor) | ||
| that will flash on each detected pulse. | ||
| PULSE_FADE = digital Output. PWM pin onnected to an LED (and 1K series resistor) | ||
| that will smoothly fade with each pulse. | ||
| NOTE: PULSE_FADE must be a pin that supports PWM. Do not use | ||
| pin 9 or 10, because those pins' PWM interferes with the sample timer. | ||
| THRESHOLD should be set higher than the PulseSensor signal idles | ||
| at when there is nothing touching it. The expected idle value | ||
| should be 512, which is 1/2 of the ADC range. To check the idle value | ||
| open a serial monitor and make note of the PulseSensor signal values | ||
| with nothing touching the sensor. THRESHOLD should be a value higher | ||
| than the range of idle noise by 25 to 50 or so. When the library | ||
| is finding heartbeats, the value is adjusted based on the pulse signal | ||
| waveform. THRESHOLD sets the default when there is no pulse present. | ||
| Adjust as neccesary. | ||
| */ | ||
| const int PULSE_INPUT = A0; | ||
| const int PULSE_BLINK = LED_BUILTIN; | ||
| const int PULSE_FADE = 5; | ||
| const int THRESHOLD = 550; // Adjust this number to avoid noise when idle | ||
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| /* | ||
| All the PulseSensor Playground functions. | ||
| */ | ||
| PulseSensorPlayground pulseSensor; | ||
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| void setup() { | ||
| /* | ||
| Use 115200 baud because that's what the Processing Sketch expects to read, | ||
| and because that speed provides about 11 bytes per millisecond. | ||
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| If we used a slower baud rate, we'd likely write bytes faster than | ||
| they can be transmitted, which would mess up the timing | ||
| of readSensor() calls, which would make the pulse measurement | ||
| not work properly. | ||
| */ | ||
| Serial.begin(115200); | ||
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| // Configure the PulseSensor manager. | ||
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| pulseSensor.analogInput(PULSE_INPUT); | ||
| pulseSensor.blinkOnPulse(PULSE_BLINK); | ||
| pulseSensor.fadeOnPulse(PULSE_FADE); | ||
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| pulseSensor.setSerial(Serial); | ||
| pulseSensor.setOutputType(OUTPUT_TYPE); | ||
| pulseSensor.setThreshold(THRESHOLD); | ||
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| // Now that everything is ready, start reading the PulseSensor signal. | ||
| if (!pulseSensor.begin()) { | ||
| /* | ||
| PulseSensor initialization failed, | ||
| likely because our particular Arduino platform interrupts | ||
| aren't supported yet. | ||
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| If your Sketch hangs here, try PulseSensor_BPM_Alternative.ino, | ||
| which doesn't use interrupts. | ||
| */ | ||
| for(;;) { | ||
| // Flash the led to show things didn't work. | ||
| digitalWrite(PULSE_BLINK, LOW); | ||
| delay(50); Serial.println('!'); | ||
| digitalWrite(PULSE_BLINK, HIGH); | ||
| delay(50); | ||
| } | ||
| } | ||
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| /* This starts the sample timer interrupt. Do this last in the setup() routine. | ||
| * We are using Timer6 to avoid potential conflict with the servo library | ||
| * This timer selection could be better... | ||
| * Use pause() and resume() to start and stop sampling on the fly | ||
| * Check Resources folder in the library for more tools | ||
| */ | ||
| sampleTimer.attachInterrupt(sampleTimer_ISR); | ||
| sampleTimer.start(2000); // Calls every period microseconds | ||
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| } | ||
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| void loop() { | ||
| /* | ||
| Wait a bit. | ||
| We don't output every sample, because our baud rate | ||
| won't support that much I/O. | ||
| */ | ||
| delay(20); | ||
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| // write the latest sample to Serial. | ||
| pulseSensor.outputSample(); | ||
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| /* | ||
| If a beat has happened since we last checked, | ||
| write the per-beat information to Serial. | ||
| */ | ||
| if (pulseSensor.sawStartOfBeat()) { | ||
| pulseSensor.outputBeat(); | ||
| } | ||
| } |
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