怎样用Arduino制作水位指示器

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描述

Arduino水位指示器如何工作?

该Arduino水位指示器使用超声波传感器或Ping传感器来确定水箱中的水位。 Ping传感器使用声纳测量距离。从该单元发射超声波(远高于人类听觉)脉冲,并且通过测量回波返回所需的时间来确定到目标的距离。 Ping传感器的输出是可变宽度脉冲,对应于到目标的距离。然后将其输入微控制器,确定水位并通过一系列LED显示。

以下项目可以是如果您有一个或直接连接到面板上的ATmega 328微控制器,则可以连接到Arduino板。您还可以查看Jeff的Maker Pro教程,了解如何将超声波传感器连接到Arduino。

Arduino水位指示器代码

将提供的草图复制粘贴到Arduino IDE中并找到“int d = 18;”行并将“18”更改为 坦克的深度,单位为厘米。

//Coded by MATHEW VARGHESE

//Note that the numbering of arduino pins are different from microcontroller pinout

int d = 18; //Enter depth of your tank here in centimeters

int trig = 11; // Attach Trig of ultrasonic sensor to pin 11

int echo = 10; // Attach Echo of ultrasonic sensor to pin 10

int pin1 = 2;//Highest level

int pin2 = 3;

int pin3 = 4;

int pin4 = 5;

int pin5 = 6;

int pin6 = 7;//Lowest evel

void setup() {

pinMode (pin1, OUTPUT);// Set pins to output for controlling I/O

pinMode (pin2, OUTPUT);

pinMode (pin3, OUTPUT);

pinMode (pin4, OUTPUT);

pinMode (pin5, OUTPUT);

pinMode (pin6, OUTPUT);

}

void loop()

{ digitalWrite(pin1, LOW);//Resetting the LEDs to off state

digitalWrite(pin2, LOW);

digitalWrite(pin3, LOW);

digitalWrite(pin4, LOW);

digitalWrite(pin5, LOW);

digitalWrite(pin5, LOW);

// Establish variables for duration of the ping,

// and the distance result in inches and centimeters:

long duration, in, cm; //‘in’ is inches and ‘cm’ is centimeter

// The PING is triggered by a HIGH pulse of 2 or more microseconds.

// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:

pinMode(trig, OUTPUT);

digitalWrite(trig, LOW);

delayMicroseconds(2);

digitalWrite(trig, HIGH);

delayMicroseconds(5);

digitalWrite(trig, LOW);

// The same pin is used to read the signal from the PING: a HIGH

// pulse whose duration is the time (in microseconds) from the sending

// of the ping to the reception of its echo off of an object.

pinMode(echo, INPUT);

duration = pulseIn(echo, HIGH);

// Convert the time into a distance

in = microsecondsToInches(duration);

cm = microsecondsToCentimeters(duration);

delay(100);// To save battery,remove if felt inconvenient

if (in 《 6 * d / 7)// Else is included to light only one led at a level and thus save battery charge

digitalWrite(pin1, HIGH);

else if (in 《 5 * d / 6)

digitalWrite(pin2, HIGH);

else if (in 《 4 * d / 6)

digitalWrite(pin3, HIGH);

else if (in 《 3 * d / 6)

digitalWrite(pin4, HIGH);

else if (in 《 2 * d / 6)

digitalWrite(pin5, HIGH);

else if (in 《 1 * d / 6)

digitalWrite(pin5, HIGH);

}

long microsecondsToInches(long microseconds)

{

// According to Parallax‘s datasheet for the PING, there are

// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per

// second)。 This gives the distance travelled by the ping, outbound

// and return, so we divide by 2 to get the distance of the obstacle.

// See: http://www.parallax.com/dl/docs/prod/acc/28015-PI.。.

return microseconds / 74 / 2;

}

long microsecondsToCentimeters(long microseconds)

{

// The speed of sound is 340 m/s or 29 microseconds per centimeter.

// The ping travels out and back, so to find the distance of the

// object we take half of the distance travelled.

return microseconds / 29 / 2;

}

建立连接

按照附带的Fritzing图表在PCB或面包板上填充电路。这是在运行Arduino的面包板上的ATMEga328。您可以按照Mayoogh Girish的教程在面包板上使用ATMega328制作您自己的Arduino板。如果您使用的是Arduino板,您可以按如下方式连接LED和超声波传感器。

上传代码

将Arduino水位指示器的代码直接刻录到Arduino板或ATMega328P微控制器上。

将超声波传感器连接到水箱上

固定Ping传感器,使其直接面向水箱中的水。带 指示LED的主控板可以在任何舒适的位置固定在家中。任何多芯 电缆(以太网电缆)都可用于连接Ping传感器和 电路的其余部分。请记住,不要增加组件之间的长度 超过20mts。

现在只需连接电池,您的非接触式Arduinowater水平指示器即可使用。

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