NodeMCU ESP8266 สัปดาห์ที่ 6

 

 ESP8266 เซ็นเซอร์วัดระยะทาง HY-SRF05 Ultrasonic

Ultrasonic Module HY-SRF05 เป็นโมดูลวัดระยะ สามารถวัดได้ตั้งแต่  2cm - 4.5m 

โค๊ด

const int pingPin = 5; //D1
	int inPin = 4; //D2
	int led = 16; //D0
	void setup() {
	pinMode(led, OUTPUT);
	digitalWrite(led, LOW);
	Serial.begin(9600);
	}
	void loop()
	{
	long duration, cm;
	pinMode(pingPin, OUTPUT);
	digitalWrite(pingPin, LOW);
	delayMicroseconds(2);
	digitalWrite(pingPin, HIGH);
	delayMicroseconds(5);
	digitalWrite(pingPin, LOW);
	pinMode(inPin, INPUT);
	duration = pulseIn(inPin, HIGH);
	cm = microsecondsToCentimeters(duration);
	Serial.print(cm);
	Serial.print("cm");
	Serial.println();
	if (cm < 10) {
	digitalWrite(led, HIGH);
	}
	else {
	digitalWrite(led, LOW);
	}
	delay(100);
	}
	long microsecondsToCentimeters(long microseconds)
	{
	// The speed of sound is 340 m/s or 29 microseconds per centimeter.
	// The ping travels out and back, so to find the distance of the
	// object we take half of the distance travelled.
	return microseconds / 29 / 2;
	}

ลิ้งhttps://www.myarduino.net/article/289/%E0%B8%AA%E0%B8%AD%E0%B8%99%E0%B9%83%E0%B8%8A%E0%B9%89%E0%B8%87%E0%B8%B2%E0%B8%99-esp8266-%E0%B9%80%E0%B8%8B%E0%B9%87%E0%B8%99%E0%B9%80%E0%B8%8B%E0%B8%AD%E0%B8%A3%E0%B9%8C%E0%B8%A7%E0%B8%B1%E0%B8%94%E0%B8%A3%E0%B8%B0%E0%B8%A2%E0%B8%B0%E0%B8%97%E0%B8%B2%E0%B8%87-hy-srf05-ultrasonic