Ky-039 5v Heartbeat Sensor Sensor Detector Module Finger Measuring For Arduino

US $340

Nanjing, China
Jan 29th

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Item Introduction KY-039 5V Heartbeat Sensor Sensor Detector Module Finger Measuring For Arduino Specification: 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. Chosing 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. Arduino Test Code int ledPin=13; int sensorPin=0; double alpha=0.75; int period=20; double change=0.0; void setup() { pinMode(ledPin,OUTPUT); } void loop() { static double oldValue=0; static double oldChange=0; int rawValue=analogRead(sensorPin); double value=alpha*oldValue+(1-alpha)*rawValue; change=value-oldValue; digitalWrite(ledPin,(change<0.0&&oldChange>0.0)); oldValue=value; oldChange=change; delay(period); } Package Contents: 1 x KY-039 Sensor Module NOTE: If you need large quantity, you could contact us. We may give you some discount. The item might be a little different from what you've seen on webpage since the accessories you received might be from different batch. However, it won't affect your use. For USA seller, the package will be sent out with tracking number, so there will be extra $2 registered airmail fees charged. So if you have multiple items, please contact us before payment, we will reduce the shipping cost. Shipping/Handling Delivery Time( Days) Country 5-10 11-15 15-20 21-25 25-30 >30 United States 10% 70% 10% 6% 3.9% 0.1% United Kingdom 5% 20% 50% 15% 9.% 1% Australia 7% 30% 30% 20% 12% 1% France 2% 10% 20% 40% 20% 8% Germany 2% 10% 20% 40% 20% 8% Canada 5% 20% 50% 15% 9% 1% Spain 2% 15% 25% 35% 20% 3% Italy 1% 10% 25% 40% 16% 8% Russia 1% 5% 25% 35% 26% 8% The package will be sent out in 24 hours after the payment is received.We will ship package via airmail. If you need tracking number, please contact us and send us extra $2 resgistered airmail fees. Import taxes and duty are not included in the price or shipping fees. Buyer should pay for it. We will send the replacement if the package is not received in 30/40 working days. If you have any problem, complaint, advise, please leave us a message.We will reply you in 24 hours and solve your problem during working time. Payment policy We only accept Paypal payment. The package will be shipped to your Paypal address. Return/DOA Policy All our products have been checked and packaged in good condition. If the item you received is defective, please contact us, we will replace another new one. You are highly important to us as a customer for a new ebayer and also in helping us ensure that we maintain the highest possible eBay Seller Rating. We thank you in advance for your “5” ratings in all eBay seller feedback categories. If there is anything about your order that would make you want to issue other than a “5” in any feedback category we encourage you to contact us by message so we can resolve the issue. We strive to have EVERY customer COMPLETELY SATISFIED with every order! Thank You for Your Support!