Getting BPM using Wemos D1

marknotlucas · July 18, 2019, 9:05pm

hey guys…
I use Sensor Pulse as my sensor.
i need to measure the heart rate BPM to display on my Blynk.
but the sensor doesn’t seems to be responding according to my finger placement. if i put my finger the sensor wont showing anything, the sensor showing some result only when i try tapping the sensor, and it get random BPM.

i got code from https://github.com/vamsikikkuri/Pulse-Sensor IoT/blob/master/Pulse_Sensor_Final.ino.

code tht i use :

#define pulsePin A0
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

char auth[] = “”;//yourauthtoken
char ssid[] = “”;//name of your wifi
char pass[] = “”;//password of wifi

int rate[10];
unsigned long sampleCounter = 0;
unsigned long lastBeatTime = 0;
unsigned long lastTime = 0, N;
int BPM = 0;
int IBI = 0;
int P = 512;
int T = 512;
int thresh = 510;
int amp = 100;
int Signal;
boolean Pulse = false;
boolean firstBeat = true;
boolean secondBeat = true;
boolean QS = false;

void setup() {
Serial.begin(9600);
Blynk.begin(auth, ssid, pass);
}

void loop() {

Blynk.run();
if (QS == true) {
Serial.println("BPM : "+ String(BPM));
Blynk.virtualWrite(V1, BPM);
QS = false;
} else if (millis() >= (lastTime + 2)) {
readPulse();
lastTime = millis();
}
}

void readPulse() {

Signal = analogRead(pulsePin);
sampleCounter += 2;
int N = sampleCounter - lastBeatTime;

detectSetHighLow();

if (N > 250) {
if ( (Signal > thresh) && (Pulse == false) && (N > (IBI / 5) * 3) )
pulseDetected();
}

if (Signal < thresh && Pulse == true) {
Pulse = false;
amp = P - T;
thresh = amp / 2 + T;
P = thresh;
T = thresh;
}

if (N > 2500) {
thresh = 510;
P = 512;
T = 512;
lastBeatTime = sampleCounter;
firstBeat = true;
secondBeat = true;
}

}

void detectSetHighLow() {

if (Signal < thresh && N > (IBI / 5) * 3) {
if (Signal < T) {
T = Signal;
}
}

if (Signal > thresh && Signal > P) {
P = Signal;
}

}

void pulseDetected() {
Pulse = true;
IBI = sampleCounter - lastBeatTime;
lastBeatTime = sampleCounter;

if (firstBeat) {
firstBeat = false;
return;
}
if (secondBeat) {
secondBeat = false;
for (int i = 0; i <= 9; i++) {
rate[i] = IBI;
}
}

word runningTotal = 0;

for (int i = 0; i <= 8; i++) {
rate[i] = rate[i + 1];
runningTotal += rate[i];
}

rate[9] = IBI;
runningTotal += rate[9];
runningTotal /= 10;
BPM = 60000 / runningTotal;
QS = true;

}

thank you
PS : sorry if my english bad

shramik_salgaonkar · July 19, 2019, 10:32am

this is cayenne IOT platform and you are using the code for blynk.
to start with get your sensor reading first. can you provide a link to the sensor which you are using?

marknotlucas · July 24, 2019, 12:58pm

Sorry dude… dont know where to ask lol

I got code from this

https://github.com/vamsikikkuri/Pulse-Sensor-IoT

shramik_salgaonkar · July 24, 2019, 1:35pm

#define pulsePin A0
#define CAYENNE_PRINT Serial
#include <CayenneMQTTESP8266.h>

// WiFi network info.
char ssid[] = "ssid";
char wifiPassword[] = "wifiPassword";

// Cayenne authentication info. This should be obtained from the Cayenne Dashboard.
char username[] = "MQTT_USERNAME";
char password[] = "MQTT_PASSWORD";
char clientID[] = "CLIENT_ID";

const int postingInterval = 10 * 1000;

int rate[10];
unsigned long sampleCounter = 0;
unsigned long lastBeatTime = 0;
unsigned long lastTime = 0, N;
int BPM = 0;
int IBI = 0;
int P = 512;
int T = 512;
int thresh = 512;
int amp = 100;
int Signal;
boolean Pulse = false;
boolean firstBeat = true;
boolean secondBeat = true;
boolean QS = false;

void setup() {
  Serial.begin(9600);
  Cayenne.begin(username, password, clientID, ssid, wifiPassword);
}

void loop() {
  Cayenne.loop();
  if (QS == true) {
    Serial.println("BPM: " + String(BPM));
    QS = false;
  } else if (millis() >= (lastTime + 2)) {
    readPulse();
    lastTime = millis();
  }
}



void readPulse() {

  Signal = analogRead(pulsePin);
  sampleCounter += 2;
  int N = sampleCounter - lastBeatTime;

  detectSetHighLow();

  if (N > 250) {
    if ( (Signal > thresh) && (Pulse == false) && (N > (IBI / 5) * 3) )
      pulseDetected();
  }

  if (Signal < thresh && Pulse == true) {
    Pulse = false;
    amp = P - T;
    thresh = amp / 2 + T;
    P = thresh;
    T = thresh;
  }

  if (N > 2500) {
    thresh = 512;
    P = 512;
    T = 512;
    lastBeatTime = sampleCounter;
    firstBeat = true;
    secondBeat = true;
  }

}

void detectSetHighLow() {

  if (Signal < thresh && N > (IBI / 5) * 3) {
    if (Signal < T) {
      T = Signal;
    }
  }

  if (Signal > thresh && Signal > P) {
    P = Signal;
  }

}

void pulseDetected() {
  Pulse = true;
  IBI = sampleCounter - lastBeatTime;
  lastBeatTime = sampleCounter;

  if (firstBeat) {
    firstBeat = false;
    return;
  }
  if (secondBeat) {
    secondBeat = false;
    for (int i = 0; i <= 9; i++) {
      rate[i] = IBI;
    }
  }

  word runningTotal = 0;

  for (int i = 0; i <= 8; i++) {
    rate[i] = rate[i + 1];
    runningTotal += rate[i];
  }

  rate[9] = IBI;
  runningTotal += rate[9];
  runningTotal /= 10;
  BPM = 60000 / runningTotal;
  QS = true;

}
CAYENNE_OUT_DEFAULT()
{
  Cayenne.virtualWrite(0, BPM);
}

sarahbaras020 · May 9, 2020, 2:54pm

Could you help me? Are there any codes for heart rate sensors used on wemos d1 r1?

shramik_salgaonkar · May 9, 2020, 5:26pm

Do a google search on how to connect a heart rate sensor to arduino devices and change the pin number to wemos.

sarahbaras020 · May 9, 2020, 11:30pm

i get this code, can you correct this code?

#define USE_ARDUINO_INTERRUPTS true
#include <PulseSensorPlayground.h>
//#include <ESP8266WiFi.h>

const char* ssid = “sadfgh”;
const char* password = “ertiope123”;

//WiFiServer server(80);

const int PulseWire = analogRead(0);
const int LED13 = 13;
int Threshold = 550;

PulseSensorPlayground pulseSensor;

void setup() {

Serial.begin(115200);

pulseSensor.analogInput(PulseWire);
pulseSensor.blinkOnPulse(2);
pulseSensor.setThreshold(Threshold);

if (pulseSensor.begin()) {
Serial.println(“We created a pulseSensor Object !”);
}
}
void loop() {

int myBPM = pulseSensor.getBeatsPerMinute();

if (pulseSensor.sawStartOfBeat()) {
Serial.println(" A HeartBeat Happened ! ");
Serial.print("BPM: ");
Serial.println(myBPM);
}
delay(20);

}

shramik_salgaonkar · May 10, 2020, 5:02am

are you getting reading from the sensor in your serial montior?

sarahbaras020 · May 10, 2020, 11:13am

not at all

sarahbaras020 · May 10, 2020, 11:20am

nothing appeared at all in the serial monitor

sarahbaras020 · May 10, 2020, 1:18pm

good news sir,

I have tried the code that you created, and the results are serial monitors can display it

it’s like a miracle that God gave me for me
thank you in advance sir …
but I still have an obstacle, which is not yet connected to cayenne sir … something that holds to cayenne Sir, cayenne is always pending when connected sir.

can you give me advice? previously I had followed the steps to add new device cayenne sir

shramik_salgaonkar · May 11, 2020, 9:21am

but you never seems to understand the advise given by me.

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Getting BPM using Wemos D1

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