HC-SR04 與 NewPing Library的結合

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最近在臉書上看到一篇文章：「原來超音波只要用echo腳位就好」。原作是在Microbit上使用，筆者就開始想在Arduino上試試看，底下為筆者搭配Arduino New Ping的成功做法。

硬體材料：

• Arduino UNO R3 板子 x 1
• 杜邦線母對母 x 7
• 330歐姆電阻 x 1
• Arduino Sensor Shield x 1
• HC-SR04 x 1
• SSD1306 I2C 0.96 吋 OLED 顯示模組 x 1
• 麵包版 x 1

硬體電路：


接線方式：
將HC-SR04 接在麵包版上，使用330歐姆的電阻將HC-SR04的 Echo 與 Trig 給接在一起。
HC-SR04  的 Echo 接到 Arduino Sensor Shield  Pin 12
OLED 的 SCL 接到 Arduino Sensor Shield  SCL
OLED 的 SDA 接到 Arduino Sensor Shield  SDA

安裝 Arduino New Ping 與 OLED的程式庫：

https://bitbucket.org/teckel12/arduino-new-ping/wiki/Home

https://github.com/adafruit/Adafruit_SSD1306

https://github.com/adafruit/Adafruit-GFX-Library

Arduino IDE 程式碼：

	#include <NewPing.h>
	#include <SPI.h>
	#include <Wire.h>
	#include <Adafruit_GFX.h>
	#include <Adafruit_SSD1306.h>
	#define SCREEN_WIDTH 128 // OLED display width, in pixels
	#define SCREEN_HEIGHT 64 // OLED display height, in pixels
	// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
	#define OLED_RESET 4 // Reset pin # (or -1 if sharing Arduino reset pin)
	Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
	#define NUMFLAKES 10 // Number of snowflakes in the animation example
	#define LOGO_HEIGHT 16
	#define LOGO_WIDTH 16
	static const unsigned char PROGMEM logo_bmp[] =
	{ B00000000, B11000000,
	B00000001, B11000000,
	B00000001, B11000000,
	B00000011, B11100000,
	B11110011, B11100000,
	B11111110, B11111000,
	B01111110, B11111111,
	B00110011, B10011111,
	B00011111, B11111100,
	B00001101, B01110000,
	B00011011, B10100000,
	B00111111, B11100000,
	B00111111, B11110000,
	B01111100, B11110000,
	B01110000, B01110000,
	B00000000, B00110000 };
	#define PING_PIN 12 // Arduino pin for both trig and echo
	NewPing sonar(PING_PIN, PING_PIN);
	void setup() {
	Serial.begin(9600);
	display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
	display.clearDisplay();
	display.setTextColor(WHITE);
	display.setCursor(0,30);
	display.setTextSize(4);
	display.println("Hello World!");
	display.display();
	}
	void loop() {
	delay(500); // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay
	unsigned int uS = sonar.ping(); // Send ping, get ping time in microseconds (uS).
	Serial.print("Ping: ");
	unsigned int distanceCM = uS / US_ROUNDTRIP_CM;
	Serial.print(distanceCM); // convert time into distance
	Serial.println("cm");
	display.clearDisplay();
	display.setTextColor(WHITE);
	display.setCursor(0,30);
	display.print(distanceCM);
	display.println("cm");
	display.display();
	}

view raw DistanceOnOLED.ino hosted with ❤ by GitHub

示範影片：