Firefly jar

 


  Howdy folks,
 I thought I would try out this blogging thing. Mostly to share and record all the things I make. Some work others fail but as long as I learn something new it does not matter.

     My first blog project is a fire fly jar that i made for a Christmas gift. It uses two ATtiny 84 micro controllers. Will post a you tube video in a couple of days.

Finished jar

Circut board on bottom of lid

Etched four boards at one time 

Diy programming  shield for ATtiny 84,45 and mega 328

       

       ISP program site

       http://arduino.cc/en/Tutorial/ArduinoISP

      

       ATtiny site may not work

       High-Low Tech – Programming an ATtiny w/ Arduino 1.0

       Alternate ATtiny site
       http://zahncenternyc.wikidot.com/attiny

      This is the code that came from the Arduino web site.

       http://forum.arduino.cc/index.php/topic,7940.0.html

   
       Code and Eagle files
     

I added the light sensor and serial code used for testing.  

/*This sketch is intended to approximate the blinking of fireflies.  It varies the delay between

 blinks and varies the total blink time.  I've used the random() function to vary which PWM  output

 is chosen for the next blink.

 Hope you get some enjoyment out of it.  I created it as a fun night light for my kids.

 Chad Richardson -- Chad@ChadsCustomWood.net

 */

/* modified by J Crossen youtube channel 22BOZIDAR 

 Code to be used with Attiny 84 with 1MHz internal clock

 For the light sensors I used a 3k photo resistor and a 4.7k resistor

      5V-----------/\/\/\-------|--------A1 analog in

              3k poto resistor  |

                                        |

  GND----------/\/\/\--------|

               4.7k resistor

               

 Tested light sensor on Arduino UNO. Only leds on pins 5 and 6 will work.

 Any values can be used 

 Use serial monitor to find correct Light_sens value and resistor values.             

 delete // to use serial on UNO. Add // when uploading to attiny 84 at 1MHZ, will not compile

 */

int value;

int pwmPin = 6;                    // light connected to digital pin 6-- I just chose an initial value

long time=0;

int period = 500;

int i = 0;

long blink_delay = 1000;        // these must be declared as long due to the random() operation

long blink = 3;

long random_led = 55;

const byte pwmPins [] = {      

  5, 6,7,8 };                  //attiny 84 pwm pins Use 3,5,6,9,10,11 on UNO

void setup()

{                                   

  //Serial.begin(9600);  // initialize serial communication at 9600 bits per second:

}                      // use for testing Light_sens value

void loop()

{

  int Light_sens = analogRead(A1);   // analog read light sensor

  //Serial.println(Light_sens);  // print out the value you read,used to find Light_sens value

  if (Light_sens <200)

  {

    choose_firefly();

    fade();

    blink_delay = random(500, 4001);

    delay(blink_delay);  

    blink = random(2, 5);  

  }

}

void fade()

{

  for(i=0; i<255;)

  {

    time = i;

    value = abs(-127+127*cos(4*PI/period*i));            //the -127 value shifts the cosine curve negative with a zero initial value; abs shifts everything positive

    analogWrite(pwmPin, value);           // sets the value (range from 0 to 255)

    delay(blink);

    i++;

  }

}

void choose_firefly()

{

  pwmPin = pwmPins [random (0, 4)];   // use 0,6 on UNO

}