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Arduino UNO R4 LED Matrix Examples
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...PulseSensor_BPM_UNO_R4_LEDmatrix_Heartbeat/PulseSensor_BPM_UNO_R4_LEDmatrix_Heartbeat.ino
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/* | ||
Code to detect pulses from the PulseSensor, | ||
using an interrupt service routine. | ||
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>>>> This example targest the Arduino UNO R4 WiFi. | ||
>>>> It will pulse the Arduino heart animation on the LED matrix to the time of your heartbeat! | ||
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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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/* | ||
We use the FspTimer to setup a timer interrupt for sample acquisition | ||
FspTimer is part of the hardware core files for the UNO R4 | ||
*/ | ||
#include "FspTimer.h" | ||
FspTimer sampleTimer; | ||
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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 PulseSensorBPM_Alternative.ino for an example of not using interrupts. | ||
*/ | ||
#define USE_ARDUINO_INTERRUPTS true | ||
#include <PulseSensorPlayground.h> | ||
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/* | ||
This is the timer interrupt service routine where we acquire and process samples | ||
*/ | ||
void sampleTimerISR(timer_callback_args_t __attribute((unused)) *p_args){ | ||
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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/* | ||
Library and variables used to draw the heart animation | ||
The Arduino heart icon will pulse with your heartbeat! | ||
*/ | ||
#include "Arduino_LED_Matrix.h" | ||
ArduinoLEDMatrix beatingHeart; | ||
byte heart[8][12] = { | ||
{ 0,0,0,0,0,0,0,0,0,0,0,0 }, | ||
{ 0,0,0,0,0,0,0,0,0,0,0,0 }, | ||
{ 0,0,0,0,0,1,0,1,0,0,0,0 }, | ||
{ 0,0,0,0,1,0,1,0,1,0,0,0 }, | ||
{ 0,0,0,0,1,0,0,0,1,0,0,0 }, | ||
{ 0,0,0,0,0,1,0,1,0,0,0,0 }, | ||
{ 0,0,0,0,0,0,1,0,0,0,0,0 }, | ||
{ 0,0,0,0,0,0,0,0,0,0,0,0 } | ||
}; | ||
byte heartPulse[8][12] = { | ||
{ 0,0,0,0,0,0,0,0,0,0,0,0 }, | ||
{ 0,0,0,0,1,1,0,1,1,0,0,0 }, | ||
{ 0,0,0,1,0,0,1,0,0,1,0,0 }, | ||
{ 0,0,0,1,0,0,0,0,0,1,0,0 }, | ||
{ 0,0,0,0,1,0,0,0,1,0,0,0 }, | ||
{ 0,0,0,0,0,1,0,1,0,0,0,0 }, | ||
{ 0,0,0,0,0,0,1,0,0,0,0,0 }, | ||
{ 0,0,0,0,0,0,0,0,0,0,0,0 } | ||
}; | ||
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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 sample reading | ||
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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/* | ||
We have to get control of a timer on the UNO R4. First, we try and see if there are any free timers available. | ||
If there are no free timers available, we will just take control of one from some other purpose. | ||
We shouldn't have to force things, but if you use alot of timers, beware of this force use code! | ||
You can check to see if you are forcing by un-commenting the "forcing timer get" print line. | ||
You can check to see what timer you have under your control by un-commenting the "got timer " print line. | ||
*/ | ||
uint8_t timer_type = GPT_TIMER; | ||
int8_t tindex = FspTimer::get_available_timer(timer_type); | ||
if(tindex == 0){ | ||
// Serial.println("forcing timer get;") | ||
FspTimer::force_use_of_pwm_reserved_timer(); | ||
tindex = FspTimer::get_available_timer(timer_type); | ||
} | ||
// Serial.print("got timer "); Serial.println(tindex); | ||
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/* | ||
sampleTimer.begin sets up the timer that we just got control of as a periodic timer with 500Hz frequency. | ||
It also passes the interrupt service routine that we made above. | ||
SAMPLE_RATE_500HZ is defined in the PulseSensorPlayground.h file. | ||
*/ | ||
sampleTimer.begin(TIMER_MODE_PERIODIC, timer_type, tindex, SAMPLE_RATE_500HZ, 0.0f, sampleTimerISR); | ||
sampleTimer.setup_overflow_irq(); | ||
sampleTimer.open(); | ||
sampleTimer.start(); | ||
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// start up the LED matrix so we can control it. | ||
beatingHeart.begin(); | ||
} | ||
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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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/* | ||
The method isInsideBeat returns true when the pulse wave is above THRESHOLD. | ||
The timing makes a nice heart pulse along with your heartbeat. | ||
*/ | ||
if(pulseSensor.isInsideBeat()){ | ||
beatingHeart.renderBitmap(heartPulse, 8, 12); | ||
} else { | ||
beatingHeart.renderBitmap(heart, 8, 12); | ||
} | ||
/* | ||
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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} | ||
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