30pcs KY-039 Finger Detection Heartbeat Sensor Modul Finger

30pcs KY-039 Finger Detection Heartbeat Sensor Modul Finger Selama Barang/Produk Masih Tayang/Aktif Berarti (Stok Tersedia), Bisa Langsung Di Order/Di Beli (Tidak Perlu Chat Toko). Masukkan Keranjang Lalu Bayar. Saat itu Juga Barang/Produk Langsung Kami Kirim. Semua Produk Di Toko Kami Pre Order 6 - 15 Hari Tergantung Stok dan Posisi Gudang Luar Negeri. Anda Order Berarti Anda Setuju Dengan Waktu Pre Order Yang Kami Tetapkan Secara Default 6 - 15 Hari. ;;;Manual: Click here to open;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.;Package includes:;30 x Finger Measuring Heartbeat Sensor SKU1606723