| Price | $1 |
|---|---|
| Category | Sensors |
| Availability | In stock |
| Delivery | Shipped across Lebanon, or collect from the lab |
A transmissive pulse sensor: an infrared LED on one side, a phototransistor facing it on the other, and your fingertip in the gap. Each heartbeat pushes a little more blood through the finger, which blocks slightly more light, and the phototransistor's analog output wobbles in time with it. Read it on an analog pin, then smooth and peak-detect in software to get beats per minute. A cheap, hands-on way to learn photoplethysmography - it is not a medical instrument.
Key features
- IR LED and phototransistor with a finger gap
- Analog output on a single signal pin
- 5V for Arduino, 3.3V for Pi and ESP boards
- Raw signal is small - needs software filtering
- 3 pins: S, +V, GND
- For learning pulse and bio-sensing
Details
Specifications
| Model | KY-039 |
|---|---|
| Type | Transmissive optical pulse sensor |
| Sensor | IR LED + phototransistor |
| Operating voltage | 5V DC (3.3V on 3.3V boards) |
| Output | Analog |
| Pins | 3 (S, +V, GND) |
