9. Holly and Ying's Prototyping Update 2

I incorporated previous code for a single LED bulb into a standard example code of DotStar LED strip. The LED strip at this stage would start to flow when the sensor detects something, and would stop flowing when there is nothing.

However, we want to change the brightness and colors of the LED strip, but this example code is the only DotStar code I could find online. This example is very basic, and it does not cover functions like setting brightness or specifying color, so I needed to do more research about those.

For sensor

 int led=12;

void setup() {

 Serial.begin(9600);

 pinMode(led,OUTPUT);

}

void loop() {

 int sensorValue=analogRead(A0);

 Serial.println(sensorValue);

 Serial.print("current time is ");

 Serial.println(millis()/1000);

 if(sensorValue<=130){

   Serial.print('N');

   Serial.print("no one here ");

 }else{

   Serial.print('Y');

   Serial.print("person here ");

   delay(100);

}

}

For Arduino with LED strip

#include <Adafruit_DotStar.h>

#include <SPI.h>      

#define NUMPIXELS 30

int incomingByte;  

int sensorValue;

#define DATAPIN    11

#define CLOCKPIN   13

Adafruit_DotStar strip = Adafruit_DotStar(

 30, 11, 13, DOTSTAR_BRG);

void setup() {

#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000L)

 clock_prescale_set(clock_div_1);

#endif

 Serial.begin(9600);

 strip.begin();

 strip.show();  

}

int      head  = 0, tail = -10;

uint32_t color = 0xFF0000;      

void loop() {

if (Serial.available() > 0) {

   incomingByte = Serial.read();

   sensorValue=Serial.read();

   Serial.println(sensorValue);

   int value=map (sensorValue, -1, 80,0,255);

   Serial.println(value);

   if(incomingByte == 'Y'){

      strip.setBrightness(value);

      strip.setPixelColor(head, color);

      strip.setPixelColor(tail, 0);    

      strip.show();                    

      delay(100);                       

    if(++head >= NUMPIXELS) {         

       head = 0;                      

      if((color >>= 8) == 0)         

        color = 0xFF0000;             

     }

    if(++tail >= NUMPIXELS) tail = 0;

   }

   

   if(incomingByte == 'N'){

   strip.setBrightness(0);

   strip.show();                     

   delay(100);

   }

   

}

 

}