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[进阶] 创客礼物 | 这条魔法项链告诉你，气温也是有色彩的

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母亲节又要到了

孝顺的你还在为送什么礼物而感到发愁吗

有位酷爱文艺与科技的创客妈咪

就给自己制作了一条项链

然而与普通手工艺品不同的是

它不仅能做配饰与各种衣服百搭

还能实时感知气温并变幻出不同的颜色

当气温较为凉爽时(20℃-25℃)，呈现翡翠绿；

当气温相对较热时(高于25℃)，呈现珊瑚红；

当气温相对较冷时(低于25℃)，呈现宝石蓝；

梦幻的颜色配合复古的吊坠

美的不像真的！

怎么做到的？

▼▼▼

教程专区

材料清单（*部分硬件来自Lilypad Kit）

Arduino控制器、温度传感器、RGB LED、鳄鱼夹，剥线钳、装饰项链，毛毡，针线、剪刀、热熔胶枪等

制作过程

1.电路搭建；可先用鳄鱼夹搭建整个电路进行测试，具体连接方式如下图所示：

2.上传代码

[mw_shl_code=applescript,true]  /*
* This program shows different light colors according to the current ambient temperature:
* It gives a green color to indicate the cool weather (68 to 78 degrees Fahrenheit).
* A red color is shown when the weather is relatively hot (above 78 degrees Fahrenheit)
* and a blue one to represent the cold weather (below 68 Fahrenheit).
*
* Written by Tahani Almanie
*/

int tempSenPin = A2; // Temperature sensor connected to analog pin A2
int tempReading; // This variable for the sensor reading
float voltage;    // This variable for the voltage value of the sensor
float tempC;       // This variable for the Centigrade temperature
float tempF;       // This variable for the Fahrenheit temperature

int redPin = 9;    // R on RGB LED connected to digital pin 9
int greenPin = 11;  // G on RGB LED connected to digital pin 11
int bluePin = 10; // B on RGB LED connected to digital pin 10

void setup()
{
Serial.begin(9600);  //Start the serial connection to view the sensor readings
}

void loop()
{
//getting the reading from the temperature sensor
tempReading = analogRead(tempSenPin);

// converting that reading to voltage
voltage = tempReading * 4.15 / 1024.0;
// print out the voltage
Serial.print(voltage); Serial.println(" volts");

// converting that voltage to Centigrade temperature
tempC = (voltage - 0.5) * 100 ;
// print out the Centigrade temperature
Serial.print(tempC); Serial.println(" degrees C");

// converting Centigrade to Fahrenheit
tempF = (tempC * 9.0 / 5.0) + 32.0;
// print out the Fahrenheit temperature
Serial.print(tempF); Serial.println(" degrees F");

//waiting 1 second
delay(1000);

lightColor();
}

void lightColor()
{
      if (tempF >= 78 )             //hot ambient gives a red light
         generateColor(255,0,0);

      else if (tempF>=68 && tempF<78)//nice ambient gives a green light
         generateColor(0,255,0);

      else                         //cold ambient gives a blue light
         generateColor(0,0,255);
}

void generateColor(int red, int green, int blue)
{
      analogWrite(redPin, 255-red);
      analogWrite(greenPin, 255-green);
      analogWrite(bluePin, 255-blue);
}[/mw_shl_code]

3.项链制作

准备所有材料和工具。