{"id":1494,"date":"2021-11-16T20:59:47","date_gmt":"2021-11-16T19:59:47","guid":{"rendered":"https:\/\/www.onetimenexttime.sk\/arduino\/?post_type=product&p=1494"},"modified":"2021-11-16T21:36:05","modified_gmt":"2021-11-16T20:36:05","slug":"fingers-measuring-detect-heartbeat-sensor-module-ky-039-3pin-mini","status":"publish","type":"product","link":"https:\/\/www.onetimenexttime.sk\/arduino\/index.php\/produkt\/fingers-measuring-detect-heartbeat-sensor-module-ky-039-3pin-mini\/","title":{"rendered":"Fingers Measuring Detect Heartbeat Sensor Module KY-039 3pin Mini"},"content":{"rendered":"

Modul sn\u00edma\u010da srdcov\u00e9ho tepu na meranie prstov KY-039 3pin Mini<\/h2>\n

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Tento projekt vyu\u017e\u00edva jasn\u00fa infra\u010derven\u00fa (IR) LED a fototranzistor na detekciu pulzu prsta, pri ka\u017edom pulze blik\u00e1 \u010derven\u00e1 LED.<\/p>\n

Pulzn\u00fd monitor funguje nasledovne: LED je sveteln\u00e1 strana prsta a fototranzistor na druhej strane prsta, fototranzistor pou\u017e\u00edvan\u00fd na z\u00edskanie emitovan\u00e9ho toku, ke\u010f krvn\u00fd tlak pulzuje prstom, ke\u010f odpor fototranzistora bude mierne zmenen\u00e9.<\/p>\n

Vybrali sme rezistor R1 s ve\u013emi vysok\u00fdm odporom, preto\u017ee v\u00e4\u010d\u0161ina svetla prech\u00e1dzaj\u00faceho prstom je absorbovan\u00e1, je \u017eiaduce, aby bol fototranzistor dostato\u010dne citliv\u00fd. Odpor je mo\u017en\u00e9 zvoli\u0165 experimentom, aby sa dosiahli najlep\u0161ie v\u00fdsledky.<\/p>\n

Najd\u00f4le\u017eitej\u0161ie je udr\u017ea\u0165 tienenie rozpt\u00fdlen\u00e9 svetlo do fototranzistora. Pri dom\u00e1com osvetlen\u00ed je to obzvl\u00e1\u0161\u0165 d\u00f4le\u017eit\u00e9, preto\u017ee svetl\u00e1 v dom\u00e1cnosti v\u00e4\u010d\u0161inou 50 Hz alebo 60 Hz kol\u00ed\u0161u, tak\u017ee slab\u00fd tlkot srdca prid\u00e1 zna\u010dn\u00fd hluk.<\/p>\n

\"KY-039<\/p>\n

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\/\/ Pulse Monitor Test Script
\nint ledPin = 13;
\nint sensorPin = A0;
\ndouble alpha = 0.75;
\nint period = 200;
\ndouble change = 0.0;<\/p>\n

void setup ()
\n{
\npinMode (ledPin, OUTPUT);
\nSerial.begin (115200);
\n}<\/p>\n

void loop ()
\n{
\nstatic double oldValue = 0;
\nstatic double oldChange = 0;
\nint rawValue = analogRead (sensorPin);
\ndouble value = alpha * oldValue + (1 – alpha) * rawValue;<\/p>\n

Serial.print (rawValue);
\nSerial.print (“,”);
\nSerial.println (value);
\noldValue = value;
\ndelay (period);
\n}<\/p>\n

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