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Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
void setup() {
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
Serial.begin(9600);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println(F("OLED init failed"));
for(;;);
}
display.clearDisplay();
display.display();
}
float getDistance() {
digitalWrite(TRIG_PIN, LOW);
delayMicroseconds(2);
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
long duration = pulseIn(ECHO_PIN, HIGH);
return duration * 0.034 / 2; // 距离（厘米）
}
int posX = 0; // 用来在横向慢慢移动
void loop() {
// 绘制两边的参考线
display.drawLine(0, 0, 0, SCREEN_HEIGHT, WHITE); // 左边的距离线
display.drawLine(SCREEN_WIDTH - 1, 0, SCREEN_WIDTH - 1, SCREEN_HEIGHT, WHITE); // 右边的距离线
display.display();
float distance = getDistance(); // 单位 cm
Serial.print("Distance: ");
Serial.println(distance);
// 归一化距离（最多显示到60cm）
int r = map(min(distance, 60.0), 0, 60, SCREEN_HEIGHT - 1, 0); // 越远越上
display.drawPixel(posX, r, WHITE);
posX++;
if (posX >= SCREEN_WIDTH) {
posX = 0;
display.clearDisplay(); // 清除屏幕从头来
}
display.display();
delay(100); // 每秒10个点
}
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