After some sanding to remove burrs from the plate and facilitate the welding process is obtained:

 

Once the plate is free from burrs, it is easier to solder the components and once all have been welded components results in:

 

Once you have the plate welded components and connectors list programming can be done, for this we will use the following code in C language

//

//

// hello.RGB.45.c

//

// RGB LED software PWM hello-world

//

// Neil Gershenfeld

// 11/10/10

//

// (c) Massachusetts Institute of Technology 2010

// This work may be reproduced, modified, distributed,

// performed, and displayed for any purpose. Copyright is

// retained and must be preserved. The work is provided

// as is; no warranty is provided, and users accept all

// liability.

//

 

#include <avr/io.h>

#include <util/delay.h>

 

#define output(directions,pin) (directions |= pin) // set port direction for output

#define set(port,pin) (port |= pin) // set port pin

#define clear(port,pin) (port &= (~pin)) // clear port pin

#define pin_test(pins,pin) (pins & pin) // test for port pin

#define bit_test(byte,bit) (byte & (1 << bit)) // test for bit set

#define PWM_delay() _delay_us(100) // PWM delay

 

#define led_port PORTB

#define led_direction DDRB

#define red (1 << PB1)

#define green (1 << PB0)

#define blue (1 << PB2)

 

int main(void) {

 //

 // main

 //

 unsigned char count, pwm;

 //

 // set clock divider to /1

 //

 CLKPR = (1 << CLKPCE);

 CLKPR = (0 << CLKPS3) | (0 << CLKPS2) | (0 << CLKPS1) | (0 << CLKPS0);

 //

 // initialize LED pins

 //

 set(led_port, red);

 output(led_direction, red);

 set(led_port, green);

 output(led_direction, green);

 set(led_port, blue);

 output(led_direction, blue);

 //

 // main loop

 //

 while (1) {

  //

  // off -> red

  //

  for (count = 0; count < 255; ++count) {

   clear(led_port,red);

   for (pwm = count; pwm < 255; ++pwm)

   PWM_delay();

   set(led_port,red);

   for (pwm = 0; pwm < count; ++pwm)

   PWM_delay();

  }

  //

  // red -> green

  //

  for (count = 0; count < 255; ++count) {

   set(led_port,red);

   clear(led_port,green);

   for (pwm = count; pwm < 255; ++pwm)

   PWM_delay();

   clear(led_port,red);

   set(led_port,green);

   for (pwm = 0; pwm < count; ++pwm)

   PWM_delay();

  }

  //

  // green -> blue

  //

  for (count = 0; count < 255; ++count) {

   set(led_port,green);

   clear(led_port,blue);

   for (pwm = count; pwm < 255; ++pwm)

   PWM_delay();

   clear(led_port,green);

   set(led_port,blue);

   for (pwm = 0; pwm < count; ++pwm)

   PWM_delay();

  }

  //

  // blue -> on

  //

  for (count = 0; count < 255; ++count) {

   set(led_port,blue);

   clear(led_port,green);

   clear(led_port,red);

   for (pwm = count; pwm < 255; ++pwm)

   PWM_delay();

   set(led_port,blue);

   set(led_port,green);

   set(led_port,red);

   for (pwm = 0; pwm < count; ++pwm)

   PWM_delay();

  }

 

  //

  // on -> off

  //

  for (count = 0; count < 255; ++count) {

   set(led_port,blue);

   set(led_port,green);

   set(led_port,red);

   for (pwm = count; pwm < 255; ++pwm)

   PWM_delay();

   clear(led_port,blue);

   clear(led_port,green);

   clear(led_port,red);

   for (pwm = 0; pwm < count; ++pwm)

   PWM_delay();

  }

 }

}

 

This code can modify the time at which the color changes are made very simply by changing the delay parameter (25), which currently has a delay of 25 ms. Performing color variations and video; however, if the parameter is changed color changes are faster or slower. You can also change the color settings to select which one is led to light and thus generate different colors by combining red, green and blue.

 

As a complement to this assignment and to use in the final draft, it will make a opto-coupling circuit to control the temperature of the resistance function will heat the material.

 

For this assignment which must make a card external outputs, for this you will work with an opto electronic coupling in this way will work with alternating and direct current without any problems of noise signals introduced by the alternating signal line, this in order to activate and deactivate the heat generating electrical resistance of the final project, analyzing the possibility of introducing a PWM signal controlled by a P controller to keep the temperature constant only