//oled

#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)

// The pins for I2C are defined by the Wire-library.

// On an arduino UNO:????A4(SDA), A5(SCL)

// On an arduino MEGA 2560: 20(SDA), 21(SCL)

// On an arduino LEONARDO:??2(SDA),?3(SCL), ...

// On an arduino ESP8266:??D2(SDA)GPIO4,?D1(SCL)GPIO5, ...

#define OLED_RESET???-1 // Reset pin # (or -1 if sharing Arduino reset pin)

#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

//oled

const int TrigPin = 11;

const int EchoPin = 12;

float distance;

void startinfo() {

?display.clearDisplay();

?display.setTextSize(2);???????// Normal 1:1 pixel scale

?display.setTextColor(SSD1306_WHITE);????// Draw white text

?display.setCursor(0, 0);??????// Start at top-left corner

?display.println(F("System"));

?display.setTextSize(2);

?display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // Draw 'inverse' text

?display.println("booting");

?display.setTextSize(2);???????// Draw 2X-scale text

?display.setTextColor(SSD1306_WHITE);

?display.println("......");

?display.display();

}

void showinfo(String temp) {

?display.clearDisplay();

?display.setTextSize(2);???????// Normal 1:1 pixel scale

?display.setTextColor(SSD1306_WHITE);????// Draw white text

?display.setCursor(0, 0);??????// Start at top-left corner

?display.println(F("Distance"));

?display.setTextSize(2);

?display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // Draw 'inverse' text

?display.println("CM: ");

?display.setTextSize(2);???????// Draw 2X-scale text

?display.setTextColor(SSD1306_WHITE);

?display.println(temp);

?display.display();

}

void setup()

{ // 初始化串口通信及連接 SR04 的引腳

?Serial.begin(115200);

?// SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally

?if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {

??Serial.println(F("SSD1306 allocation failed"));

??for (;;); // Don't proceed, loop forever

?}

?// Show initial display buffer contents on the screen --

?// the library initializes this with an Adafruit splash screen.

?display.display();

?delay(2000); // Pause for 2 seconds

?startinfo() ;

?delay(1000);

?pinMode(TrigPin, OUTPUT);

?// 要檢測引腳上輸入的脈沖寬度，需要先設(shè)置為輸入狀態(tài)

?pinMode(EchoPin, INPUT);

?Serial.println("Ultrasonic sensor:");

}

void loop()

{

?// 產(chǎn)生一個(gè) 10us 的高脈沖去觸發(fā) TrigPin

?digitalWrite(TrigPin, LOW);

?delayMicroseconds(2);

?digitalWrite(TrigPin, HIGH);

?delayMicroseconds(10);

?digitalWrite(TrigPin, LOW);

?// 檢測脈沖寬度，并計(jì)算出距離

?distance = pulseIn(EchoPin, HIGH) / 58.00;

?Serial.print(distance);

?Serial.print("cm");

?Serial.println();

?showinfo(String (distance));

?delay(1000);

}