arduino入门18-进阶-OLED1306+HCSR04超声波测距仪#跟着J
//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()
{ // 初始化串口通信及连接 SR04 的引脚
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);
// 要检测引脚上输入的脉冲宽度，需要先设置为输入状态
pinMode(EchoPin, INPUT);
Serial.println("Ultrasonic sensor:");
}
void loop()
{
// 产生一个 10us 的高脉冲去触发 TrigPin
digitalWrite(TrigPin, LOW);
delayMicroseconds(2);
digitalWrite(TrigPin, HIGH);
delayMicroseconds(10);
digitalWrite(TrigPin, LOW);
// 检测脉冲宽度，并计算出距离
distance = pulseIn(EchoPin, HIGH) / 58.00;
Serial.print(distance);
Serial.print("cm");
Serial.println();
showinfo(String (distance));
delay(1000);
}
