Mô-đun cảm biến đo nhịp tim ngón tay KY039 cao cấp
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Máy Tính & Laptop > Thiết Bị Mạng > Khác > Mô-đun cảm biến đo nhịp tim ngón tay KY039 cao cấp
- Giao hàng toàn quốc
- Được kiểm tra hàng
- Thanh toán khi nhận hàng
- Chất lượng, Uy tín
- 7 ngày đổi trả dễ dàng
- Hỗ trợ xuất hóa đơn đỏ
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Giới thiệu Mô-đun cảm biến đo nhịp tim ngón tay KY039 cao cấp
This project uses bright infrared (IR) LED and a phototransistor to detect the pulse of the finger, a red LED flashes with each pulse.Pulse monitor works as follows: The LED is the light side of the finger, and phototransistor on the other side of the finger, phototransistor used to obtain the flux emitted, when the blood pressure pulse by the finger when the resistance of the phototransistor will be slight changed.
We chose a very high resistance resistor R1, because most of the light through the finger is absorbed,it is desirable phototransistor sensitive enough.Resistance can be selected by experiment to get the best results.
The most important is to keep the shield stray light into the phototransistor. For home lighting that is particularly important because the lights at home mostly based 50HZ or 60HZ fluctuate, so faint heartbeat will add considerable noise.
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