Serial prints junk on ESP8266 about pulsesensorplayground

[biomurph]

@katerss1
you're not providing enough information for us to help troubleshoot your problem.
exactly what code are you using?
what is your physical setup?
send or attach a picture of your hardware for verification
what is this so-called 'junk' that you speak of?

[stefankaters]

Sorry for the brief explanation.

exactly what code are you using?
I used the Getting_BPM_to_Monitor example.

/*  Getting_BPM_to_Monitor prints the BPM to the Serial Monitor, using the least lines of code and PulseSensor Library.
 *  Tutorial Webpage: https://pulsesensor.com/pages/getting-advanced
 *
--------Use This Sketch To------------------------------------------
1) Displays user's live and changing BPM, Beats Per Minute, in Arduino's native Serial Monitor.
2) Print: "♥  A HeartBeat Happened !" when a beat is detected, live.
2) Learn about using a PulseSensor Library "Object".
4) Blinks LED on PIN 13 with user's Heartbeat.
--------------------------------------------------------------------*/

#define USE_ARDUINO_INTERRUPTS true    // Set-up low-level interrupts for most acurate BPM math.
#include <PulseSensorPlayground.h>     // Includes the PulseSensorPlayground Library.   

//  Variables
const int PulseWire = 0;       // PulseSensor PURPLE WIRE connected to ANALOG PIN 0
const int LED13 = 13;          // The on-board Arduino LED, close to PIN 13.
int Threshold = 550;           // Determine which Signal to "count as a beat" and which to ignore.
                               // Use the "Gettting Started Project" to fine-tune Threshold Value beyond default setting.
                               // Otherwise leave the default "550" value. 
                               
PulseSensorPlayground pulseSensor;  // Creates an instance of the PulseSensorPlayground object called "pulseSensor"


void setup() {   

  Serial.begin(9600);          // For Serial Monitor

  // Configure the PulseSensor object, by assigning our variables to it. 
  pulseSensor.analogInput(PulseWire);   
  pulseSensor.blinkOnPulse(LED13);       //auto-magically blink Arduino's LED with heartbeat.
  pulseSensor.setThreshold(Threshold);   

  // Double-check the "pulseSensor" object was created and "began" seeing a signal. 
   if (pulseSensor.begin()) {
    Serial.println("We created a pulseSensor Object !");  //This prints one time at Arduino power-up,  or on Arduino reset.  
  }
}



void loop() {

 int myBPM = pulseSensor.getBeatsPerMinute();  // Calls function on our pulseSensor object that returns BPM as an "int".
                                               // "myBPM" hold this BPM value now. 

if (pulseSensor.sawStartOfBeat()) {            // Constantly test to see if "a beat happened". 
 Serial.println("♥  A HeartBeat Happened ! "); // If test is "true", print a message "a heartbeat happened".
 Serial.print("BPM: ");                        // Print phrase "BPM: " 
 Serial.println(myBPM);                        // Print the value inside of myBPM. 
}

  delay(20);                    // considered best practice in a simple sketch.

}

what is your physical setup?
I use the Wemos D1 MINI. 3 wires: 1 signal to A0, + to 5V, - to ground.

send or attach a picture of your hardware for verification
https://prnt.sc/p5vc15

what is this so-called 'junk' that you speak of?
^EP⸮F⸮,MH⸮⸮G⸮�h⸮ something like this inside my serial monitor even though i use the exact same baud rate: 9600

[biomurph]

@katerss1
Thanks for the clarification. There's a couple of problems with your setup.

First, based on the Wemos page I found here you are only allowed to put in 3.2V max into the analog input. So you should move the + connector to the 3.3V pin instead of the 5V pin. Not sure if you have damaged the input or not, but that is possible.

Second, you are using a knockoff Pulse Sensor. Please support the original makers of Pulse Sensor and purchase legit hardware. I cannot help you with any hardware related issues because I don't know what is on that clone.

Third, try simply sending some Serial print commands without the sensor plugged in to ensure that you can at least get that working.