查看“点阵显示超声波距离”的源代码

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<p style="color: #4F4E4E;font-size:220%">'''Sensor-Ultrasonic+点阵显示超声波距离'''</p>
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本示例给出了超声波传感器测得的距离在点阵上显示的方法，显示距离的单位为米，例如显示1.2，表示测得距离为1.2米

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<p style="color: #E87E05;font-size:135%">所需硬件</p>
*[[mCenter+]]
*[[Sensor-Ultrasonic+]]
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<p style="color: #E87E05;font-size:135%">电路搭建</p>
将Ultrasonic+传感器接到Hub的IIC引脚。
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将mCenter+（或者用Battery、Core、Hub堆叠在一起代替mCenter+，代替后核心选择core）通过MicroUSB数据线接入电脑，核心选择core+ 5V。初次使用请参考：[[AVR核心：Getting_started/zh|Getting Started]]。
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<p style="color: #E87E05;font-size:135%">代码</p>
<source lang="cpp">
#include <Microduino_Matrix.h>
#include <Microduino_Ultrasonic.h>

uint8_t Addr[MatrixPix_X][MatrixPix_Y] = {
  {48}
};

Ultrasonic Ultrasonic1(ULTRASONIC_ADDR_1);
Matrix display = Matrix(Addr, TYPE_S2);

uint8_t score_num[10][5] = {
  0x70, 0x50, 0x50, 0x50, 0x70,
  0x10, 0x10, 0x10, 0x10, 0x10,
  0x70, 0x10, 0x70, 0x40, 0x70,
  0x70, 0x10, 0x70, 0x10, 0x70,
  0x50, 0x50, 0x70, 0x10, 0x10,
  0x70, 0x40, 0x70, 0x10, 0x70,
  0x70, 0x40, 0x70, 0x50, 0x70,
  0x70, 0x10, 0x10, 0x10, 0x10,
  0x70, 0x50, 0x70, 0x50, 0x70,
  0x70, 0x50, 0x70, 0x10, 0x70,
};

uint16_t Distance, Dis, lastDis;

uint8_t scoreMap[8];

void dispScore(uint16_t num)
{
  uint8_t score1, score2 , score3;
  uint8_t tmp_x, i, j, m, n;
  score1 = num / 100;
  score2 = (num % 100) / 10;
  score3 = num % 10;
  m = score1 / 8;
  n = score1 % 8;

  memset(scoreMap, 0, sizeof(scoreMap));

  for (i = 0; i < m; i++)
    scoreMap[i] = 0xff;

  for (j = 0; j < n; j++)
    scoreMap[m] |= (0x80 >> j);

  for (i = 0; i < 5; i++) {
    for (j = 0; j < 4; j++) {
      if ((score_num[score2][i] & (0x80 >> j)) == (0x80 >> j))
        scoreMap[3 + i] |= 0x80 >> j;
    }
  }

  for (i = 0; i < 5; i++) {
    for (j = 0; j < 4; j++) {
      if ((score_num[score3][i] & (0x80 >> j)) == (0x80 >> j))
        scoreMap[3 + i] |= 0x80 >> (j + 4);
    }
  }
}
void updateScore() {
  for (uint8_t pix = 0; pix < 8; pix++) {
    for (uint8_t row = 0; row < 8; row++) {
      if ((scoreMap[pix] >> row) & 0x01)
        display.setLed(7 - row, pix, true);   
      else
        display.setLed(7 - row, pix, false);
    }
  }
}

void setup() {
  Serial.begin(9600);
  Wire.begin();
  display.setBrightness(80);
  display.clearDisplay();
  if (Ultrasonic1.begin()) {                //如果超声波初始化成功
    Serial.println("Ultrasonic is online");//串口打印信息
  }
  delay(2000);
}

void loop() {
  Distance = Ultrasonic1.getDistance();
  Serial.println(Distance);
  Dis = Distance / 100;
  if (lastDis != Dis) {
    lastDis = Dis;
    dispScore(Dis);
    updateScore();
    display.setLed(4, 7, true);
  }
  delay(2);
}
</source>
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