Heartbeat Sensor Brick

Pictured with the KY-039 kit module plugged in.

Kit Bricks · SKU TP-K35

Finger pulse sensor (IR LED + phototransistor).

₹299

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Works with TinkerPie V1 · Arduino C++ with the TinkerPieBricks library · Delivery across India: ₹100, 3–7 days · 7-day replacement for damaged or defective kits

About this kit

Finger pulse sensor (IR LED + phototransistor). The Heartbeat Sensor Brick is a carrier for the KY-039 module from common 37-in-1 sensor kits: plug the module into the socket and connect one cable to a TinkerPie SENSOR port. A small CH32V003 processor on the brick does the timing work, so your program simply reads the result over I2C.

Features

• Raw pulse waveform 10-bit
• Beat detection + BPM in the brick
• Science-class demo, not a medical device
• Plug the kit module straight into the socket – no jumper wires
• One cable to any TinkerPie SENSOR port (I2C), BUS IN + BUS OUT to chain more bricks
• On-board CH32V003 does the timing – your code just reads the result

Specifications

Safety: For science and fun: a demo of how pulse sensors work, not a medical device.

How to use it with TinkerPie

1. Plug the KY-039 module into the 2.54 mm socket on the top edge. Match the pin names: the brick says S + -, the module has the same letters.
2. Connect BUS IN to any TinkerPie SENSOR 1-4 port with a 4-pin JST-PH cable (the same cable as the other sensors).
3. More bricks? Plug the next one into BUS OUT. Two bricks of the same type need different addresses: bridge ADDR +1, +2 or +4 on the back (0x08-0x0F; the first is 0x08).
4. Install the TinkerPie and TinkerPieBricks Arduino libraries, open the quick-start sketch below, choose the board ESP32S3 Dev Module and upload.

Libraries: TinkerPie and TinkerPieBricks (Arduino IDE: Sketch → Include Library → Add .ZIP Library). Full guide: getting started with TinkerPie Bricks.

Quick start

Upload this, open the Serial Monitor at 115200 baud and watch the TinkerPie matrix.

// Heartbeat Sensor Brick (TP-K35): quick start
// Reads the brick and shows the value on the TinkerPie matrix and in the Serial Monitor (115200 baud).
#include <TinkerPie.h>
#include <TinkerPieBricks.h>
using namespace tinkerpie;

tpb::KitSensor hb;

void setup() {
  Serial.begin(115200);
  tinkerpie::begin();            // also starts the SENSOR ports (I2C bus Wire1)
  if (!hb.begin(tpb::KitSensor::PULSE)) Serial.println("Heartbeat Sensor Brick not found at 0x08: check the cable to SENSOR 1-4");
}

void loop() {
  uint16_t bpm = hb.bpm();           // 0 = no finger yet
  Serial.printf("%u BPM\n", bpm);
  if (bpm) basic::showNumber(bpm, Colors::Red); else basic::showIcon(IconNames::SmallHeart, Colors::Red);
  basic::pause(1000);
}

Project: Beating heart display

Rest a fingertip gently on the sensor. The heart on the matrix beats with your pulse and the BPM scrolls. A science demo, not a medical device.

// Beating heart display: Heartbeat Sensor Brick (TP-K35)
// Rest a fingertip gently on the sensor. The heart on the matrix beats with your pulse and the BPM scrolls. A science demo, not a medical device.
#include <TinkerPie.h>
#include <TinkerPieBricks.h>
using namespace tinkerpie;

tpb::KitSensor hb;
uint8_t last = 0;

void setup() {
  Serial.begin(115200);
  tinkerpie::begin();            // also starts the SENSOR ports (I2C bus Wire1)
  if (!hb.begin(tpb::KitSensor::PULSE)) Serial.println("Heartbeat Sensor Brick not found at 0x08: check the cable to SENSOR 1-4");
  last = hb.beats();
}

void loop() {
  uint8_t n = hb.beats();
  if (n != last) { last = n; basic::showIcon(IconNames::Heart, Colors::Red); basic::showIcon(IconNames::SmallHeart, Colors::Red); }
  if (input::buttonIsPressed(Button::A)) basic::showNumber(hb.bpm(), Colors::Pink);
  basic::pause(10);
}

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