Warm robot: heartbeat sensor

From now I’m gonna refer to my final project as Warm Robot, just a temporary name but it makes it easy to track the project’s progress.

After purchasing the pulse sensor, I tried to do a test with it with LED light as an output. It reads my heartbeat pretty well, especially when I hooked it up on my ear.

(it came with an ear clip!)

I wrote the code for analog serial reader and added an LED for an output (and additional LED to test out multiple output), here’s the code:

---

int Threshold = 520; //the turning point when the heart beats
int LED1 = 13; //first LED, to indicate each beat
int LED2 = 5; //another output in correspondence to the first LED

void setup() {
 Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
 int Pulse = analogRead(A0); //where I plugged in my pulse sensor
 
 // print out the value you read:
 Serial.println(Pulse);

if (Pulse > Threshold){
 digitalWrite(LED1,HIGH); 
 } else {
 digitalWrite(LED1,LOW);
 }
 delay(10);

if (LED1, HIGH){
 digitalWrite(LED2,HIGH);
 delay(2);
 digitalWrite(LED2,LOW);
 delay(2); 
 digitalWrite(LED2,HIGH);
 delay(2);
 digitalWrite(LED2,LOW);
 delay(4); /* i made sure the total of delay is less than or
the same number as the LED1 delay */
 } else {
 digitalWrite(LED2,LOW);
 } 
}

---

 

Then I opened the serial plotter to see the graph of the value from the pulse sensor. I googled and looked around codes people have written to find a best way to count each heartbeat and so far putting a threshold seems like the simplest one that worked for me. I wonder if there’s a way to count it for each +apex and -apex? is that even possible? I think? I’ll need to consult someone for this.

mmmm yaA i’m alive

it seems to be working with LED lights, I tried piezo for a sound output but it doesn’t seem to be working.. I thought it would work if I just change it from digital to analog. Regardless, it’s a step forward!! let’s see what else I can do before class on Wednesday!