shop/ circuitrocks/ ky-039 finger detection heartbeat sensor

A compact optical pulse sensor made to detect heartbeat signals from a fingertip. It uses an IR LED and phototransistor to sense small blood-flow changes and sends them as an analog signal.

Features:

  • Detects pulse from a fingertip
  • Uses IR LED and phototransistor
  • Analog signal output
  • 3-pin connection
  • Works with 3.3V or 5V
  • Compact and easy to use
  • Suitable for Arduino and similar boards

Applications:

  • Heartbeat detection projects
  • Arduino health-monitoring builds
  • Fitness and pulse projects
  • Biomedical school projects
  • Sensor experiments
  • DIY electronics

FAQ

Will this ship from Manila?

Yes — all stock ships from our Quezon City warehouse. Order before 4 PM weekdays for same-day cutoff via J&T or LBC.

Do you ship nationwide?

Yes. Metro Manila usually arrives next-day; provincial 1–3 working days.

Can I get this on a school PO or class order?

Yes — we accept Purchase Orders from accredited schools and universities. Contact us with your PO details and we'll process it.

Is this compatible with Arduino, ESP32, or Raspberry Pi?

Most parts work with common maker boards — check the description for specific pinout / voltage notes. If you're unsure, send us a message before ordering.

What's your return policy?

7-day inspection window for DOA units. Email proof of issue and we'll ship a replacement or refund. Used / installed parts are not returnable unless faulty.

Do you offer technical support?

Yes — questions land on our forum or via email, weekday or weekend. We've actually wired up most of what we sell.

Build with this board

// from learn.circuit.rocks

Notes from the bench

// from blog.circuit.rocks

Ask the community

// from forum.circuit.rocks