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#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
// DI pin of LED ring
#define PIN 11
// number of pixels in the ring
#define NUMPIXELS 16
// input pin for connecting uECG
int in_pin = 3;
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
void setup() {
pixels.begin(); // This initializes the NeoPixel library.
pinMode(in_pin, INPUT); //set pin to input mode
digitalWrite(in_pin, 1); //enable PULLUP: this is critical, uECG doesn't have internal pull-up
}
//we store last 20 heartbeats to averge BPM over them
//with higher value, it will become more reliable,
//but it will take more time to see output change when BPM changes
#define BEAT_HIST 20
long beats[BEAT_HIST];
void push_beat(long ms) //shift all beats in array and insert current one
{
for(int x = 0; x < BEAT_HIST-1; x++)
{
beats[x] = beats[x+1];
}
beats[BEAT_HIST-1] = ms;
}
int get_bpm() //using time difference between first and last beats
{
long dt = beats[BEAT_HIST-1] - beats[0];
long bpm = BEAT_HIST * 60000 / dt;
return bpm;
}
long last_pix_upd = 0; //to keep track of when we updated pixels previous time
int prev_in_state = 0; //previous state of input pin: we want to process only changes of state
void loop()
{
long ms = millis();
int in_state = digitalRead(in_pin); //1 when no beat detected, 0 in beat
if(in_state == 1 && prev_in_state == 0) //react only to change
{
push_beat(ms);
}
prev_in_state = in_state;
if(ms - last_pix_upd > 10) //don't update pixels too often
{
int r, g, b;
last_pix_upd = ms;
int bpm = get_bpm();
int max_bright = 120; //value of maximum brightness, max 255. But you don't always want it at max :)
float dd = 20; //change in BPM between color tones (blue->green->yellow->pink->red)
float t1 = 90, t2, t3, t4; //t1 - "base" BPM, lower than t1 would be blue
t2 = t1 + dd;
t3 = t2 + dd;
t4 = t3 + dd;
//code for changing color depending in which t1...t4 range we are now
if(bpm < t1){ r = 0; g = 0; b = max_bright; }
else if(bpm < t2) { r = 0; g = max_bright * (bpm-t1)/dd; b = max_bright - g; }
else if(bpm < t3) { r = max_bright * (bpm-t2)/dd; g = max_bright - r; b = r/4; }
else if(bpm < t4) { r = max_bright; g = 0; b = max_bright/2 - max_bright * (bpm-t3)/(2*dd); }
else {r = max_bright; g = 0; b = 0; }
if(in_state) //when not in beat, 1/4 intensity, so only beats are highlighted
{
r *= 0.25;
g *= 0.25;
b *= 0.25;
}
int on_pixels = (bpm+5)/10; //number of used LEDs: for 60 BPM, 6 LEDs will be on, for 120 - 12 etc
for(int i=0;i<NUMPIXELS;i++)
{
if(i < on_pixels) pixels.setPixelColor(i, pixels.Color(r,g,b));
else pixels.setPixelColor(i, pixels.Color(0,0,0)); //turn off all other LEDs
}
pixels.show();
}
}

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