尝试使用Arduino Nano使OLED显示来自超声波距离传感器的输入

Question

我很难从超声波测距仪获得输入，以便在Oled显示器上显示距离。我用的是Arduino Nano。我可以让显示器打印Hello World，同时可以在Arduino IDE串行监视器上查看来自测距仪的所有输入。我用的是1.3英寸的oled显示屏和3针超声波测距仪。它有vcc、地和信号引脚。我尝试了许多不同的组合，试图让它显示，但都不起作用。这是我目前所拥有的，至少可以让这两个设备同时工作。对于显示器和传感器，制造商提供了代码，使它们在Arduino Nano上独立工作。很抱歉对我的代码造成了所有的混淆。

#include <U8glib.h>
#include "Arduino.h"

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE|U8G_I2C_OPT_DEV_0); // for 0.96” and 1.3”

class Ultrasonic
{
  public:
    Ultrasonic(int pin);
    void DistanceMeasure(void);
    long microsecondsToCentimeters(void);
    long microsecondsToInches(void);
  private:
    int _pin; //pin number of Arduino that is connected with SIG pin of Ultrasonic Ranger.
        long duration;  // the Pulse time received;
};
Ultrasonic::Ultrasonic(int pin)
{
  _pin = pin;
}
/*Begin the detection and get the pulse back signal*/
void Ultrasonic::DistanceMeasure(void)
{
  pinMode(_pin, OUTPUT);
  digitalWrite(_pin, LOW);
  delayMicroseconds(2);
  digitalWrite(_pin, HIGH);
  delayMicroseconds(5);
  digitalWrite(_pin,LOW);
  pinMode(_pin,INPUT);
  duration = pulseIn(_pin,HIGH);
}
/*The measured distance from the range 0 to 400 Centimeters*/
long Ultrasonic::microsecondsToCentimeters(void)
{
  return duration/29/2; 
}
/*The measured distance from the range 0 to 157 Inches*/
long Ultrasonic::microsecondsToInches(void)
{
  return duration/74/2; 
}

Ultrasonic ultrasonic(7);
void setup(void)
{
  Serial.begin(9600);

  if ( u8g.getMode() == U8G_MODE_R3G3B2 ) {
    u8g.setColorIndex(255);     // white
  }
  else if ( u8g.getMode() == U8G_MODE_GRAY2BIT ) {
    u8g.setColorIndex(3);         // max intensity
  }
  else if ( u8g.getMode() == U8G_MODE_BW ) {
    u8g.setColorIndex(1);         // pixel on
  }
  else if ( u8g.getMode() == U8G_MODE_HICOLOR ) {
    u8g.setHiColorByRGB(255,255,255);
  }
}
void loop(){
{
  long RangeInInches;
  long RangeInCentimeters;
  ultrasonic.DistanceMeasure(); // get the current signal time;
  RangeInInches = ultrasonic.microsecondsToInches(); //convert the time to inches;
  RangeInCentimeters = ultrasonic.microsecondsToCentimeters(); //convert the time to centimeters
  Serial.println("The distance to obstacles in front is: ");
  Serial.print(RangeInInches);//0~157 inches
  Serial.println(" inch");
  Serial.print(RangeInCentimeters);//0~400cm
  Serial.println(" cm");
  delay(100);
}
{
  // picture loop
  u8g.firstPage();  
  do {
    draw();
  } while( u8g.nextPage() );
  // rebuild the picture after some delay
  delay(50);
}
}
void draw(void) {
  u8g.setFont(u8g_font_unifont);
  u8g.setPrintPos(5, 20); 
  u8g.print("Hello World!");
}

Answer 1

我不能尝试这个，但我猜你必须将超声波传感器的范围转换为字符串，使用String()，然后你可以将其绘制在有机发光二极管显示器上。如果您在循环函数外部声明变量，则也可以在绘图函数中使用它们。

long RangeInInches;
long RangeInCentimeters;

void loop() { 
    ...
    RangeInCentimeters = ...
    Serial.print(RangeInCentimeters);
}

void draw() {
    ...
    u8g.print(String(RangeInCentimeters));
}