I'm making an esp32 pulse sensor and facing problems with the code to send my pulse sensor data to thingspeak. Here's the code I'm using:
```
#define USE_ARDUIO_INTERRUPTS true
#include "ThingSpeak.h"
#include <WiFi.h>
#include <PulseSensorPlayground.h>
const char* ssid = "HUAWEI-ChwU"; // your network SSID (name)
const char* password = "03003038745"; // your network password
WiFiClient client;
unsigned long myChannelNumber = 2010078 ;
const char * myWriteAPIKey = "RHRTPZAXDHUT927V";
// Timer variables
unsigned long lastTime = 0;
unsigned long timerDelay = 30000;
// Variables
const int PulseWire = 36; // PulseSensor PURPLE WIRE connected to ANALOG PIN 0
const int LED = 2; // The on-board Arduino LED, close to PIN 13.
int Threshold = 2000; // 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 initBPM() {
// Configure the PulseSensor object, by assigning our variables to it.
pulseSensor.analogInput(PulseWire);
pulseSensor.blinkOnPulse(LED); //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 setup() {
Serial.begin(9600); // For Serial Monitor
initBPM();
WiFi.mode(WIFI_STA);
ThingSpeak.begin(client); // Initialize ThingSpeak
}
void loop() {
if ((millis() - lastTime) > timerDelay) {
// Connect or reconnect to WiFi
if(WiFi.status() != WL_CONNECTED){
Serial.print("Attempting to connect");
while(WiFi.status() != WL_CONNECTED){
WiFi.begin(ssid, password);
delay(5000);
}
Serial.println("\nConnected.");
}
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.
}
// Write to ThingSpeak. There are up to 8 fields in a channel, allowing you to store up to 8 different
// pieces of information in a channel. Here, we write to field 1.
int x = ThingSpeak.writeField(myChannelNumber, 1, myBPM, myWriteAPIKey);
//uncomment if you want to get temperature in Fahrenheit
//int x = ThingSpeak.writeField(myChannelNumber, 1, temperatureF, myWriteAPIKey);
if(x == 200){
Serial.println("Channel update successful.");
}
else{
Serial.println("Problem updating channel. HTTP error code " + String(x));
}
lastTime = millis();
}
}
```
And here's the compile time error that I'm facing rn:
```
C:\Users\DELL\AppData\Local\Temp\arduino-sketch-CBF3B8ED5F9B2285CB06B657267B11A1\libraries\PulseSensor_Playground\PulseSensorPlayground.cpp.o:(.literal._ZN21PulseSensorPlayground5beginEv+0x0): undefined reference to `PulseSensorPlayground::UsingInterrupts'
C:\Users\DELL\AppData\Local\Temp\arduino-sketch-CBF3B8ED5F9B2285CB06B657267B11A1\libraries\PulseSensor_Playground\PulseSensorPlayground.cpp.o:(.literal._ZN21PulseSensorPlayground5beginEv+0x8): undefined reference to `PulseSensorPlaygroundSetupInterrupt()'
C:\Users\DELL\AppData\Local\Temp\arduino-sketch-CBF3B8ED5F9B2285CB06B657267B11A1\libraries\PulseSensor_Playground\PulseSensorPlayground.cpp.o: In function `PulseSensorPlayground::begin()':
c:\Users\DELL\Documents\Arduino\libraries\PulseSensor_Playground\src/PulseSensorPlayground.cpp:285: undefined reference to `PulseSensorPlaygroundSetupInterrupt()'
collect2.exe: error: ld returned 1 exit status
exit status 1
Compilation error: exit status 1
```
