OS Assignments Week 10

Assignments

Group Assignment

Measure the power consumption of an output device

Individual Assignment

Add an output device to a microcontroller board you've designed, and program it to do something

GROUP ASSIGNMENT

More specific detailed from the worked done with Ernesto Castro in Fab Lab Universidad de Lima here

m e a s u r e P o w e r C O N S U M P T I ON

We divided to measure our own outputs and then make comparisons. Mine was the LED RGB. To measure the power consumption I separated the led rgb in a breadboard so it can be easier to measure with the multimeter. Then connected it in series within the components of the circuit. I made a diagram of how this measure works in the circuit to understand where to include the multimeter.

Measure with the breadboard in series

Led rgb V O L T A G E f o r m u l a:
V = I X R
V: is the voltage in volts
I: is the current in amperes
R: is the resistance in ohms

Resistance

V = I X R

First, the current is measured in amperes. I had to make sure the multimeter is in the correct mode to amperes.
It measured 0.1 ohms.

Voltage in volts

V = X R

First, the current is measured in amperes. I had to make sure the multimeter is in the correct mode to amperes.
It measured 2.2 volts.

V = I X R
V=2.2

Individual extra assignment
Once I measure the power consumption of the LED RGB as one, I asked my instructor if it was the same for each color. However as this led works with 3 different colors that need 3 different pins, the power is not the same. Each color needs its own power. So I made another measure by myself to be sure about the power of its color.

R G B powerconsumption

Diagram of how I measure each led

To measure each color I had to interrupt the circuit between the color pin. So I extended the circuit in a breadboard and make this diagram to identify the different energy consumption each led makes following this diagram:

Diagram of how I measure each led

I identify 3 moments to measure: Each led directly to VCC, resistance between each led and their pins, and the energy difference between each resistance and VCC.

	voltage	LED	LED + R
Red	1.38 v	0.46	0.46
Blue	3.3 v	1.77	2
Green	3.3 v	1.77	3.67

CONCLUSION:
For the led rgb each color makes an specific energy consumption to show its color. It is different to measure each part of the circuit since each component makes something specific. And all this is important to make sure the energy supplier is enough.

For this assignment I decided to try for output a led rgb since my final project will need a lot of color combinations and for now I tried to catch the colors i wanted and make a palette for the final.

Personal assignments left by the local instructor

PCB board for the led rgb. ☑

Programm the led rgb colors ☑
Try to cut or print a case for the led.

Output LED RGB tested

before starting

First I tried the rgb led in a breadborad to make sure to understand how it works. And tried to programm to turn on each led color in its pure code being 0 the maximum color of each led (because it is common anode) and 255 turn off.

pcb board solded

The first code I made to understand each color:

Red	255
Blue	255
Green	0

I turn on the green led by being the only one at 0 and the other two at 255.

As this rgb led works with common anode 255 is to turn off the color and 0 is the maximum of the pure color.For this test I only turn the colors in a void loop.

int ledRojo = 9; 
int ledVerde = 8;
int ledAzul = 7;

void setup() {
  pinMode(ledRojo, OUTPUT);
  pinMode(ledVerde, OUTPUT);
  pinMode(ledAzul, OUTPUT);
}

void loop() {
  // 
  analogWrite(ledRojo, 255);
  analogWrite(ledVerde, 0);
  analogWrite(ledAzul, 255);
}

Personal assignments

1. PCB board LED RGB

In week 8 I made my pcb board thinking about connecting in the future a board with a rgb led since I knew I need it for my final project. So apart from free pins to try different components I exclusively make a space for this output board. I left for it 4 digital pins, two VCC pins and one for GND. The plan for this was to connect this new board directtly yo the pins without using cables.

Week 8 pcb board

Then I made the schematic and the pcb design for TWO rgb leds controlled by the same pins. So they will change in pair. I tried this since for the final project all the leds will be the same since I dont have 20 free pins.

PCB design process
From weeks before I fabricated from the schemtic design the board for two leds. I had some problems soldering the components as it is really small but I did my best at the end.

When I was solding the pcb I noice I didn't consider that the connection will be upside down since is on the other side of the board. However it still works and better because I am left blind by the led intensity so being upside down helps with eyes a lot.

lgb board upside down

2. Programm the led rgb colors

So in a previous test I understand how the values of each rgb color worked. So, for this week I want to test finding a color palette I like for my final lightstick.

Chaging intensity of the first color of the palette:

Red	0	0	0	0	0	0	0	0	0	0
Blue	0	0	0	0	0	0	0	0	0	0
Green	25	50	75	100	125	150	175	200	225	255

Magenta I want to find a variation of magenta from more intense to less intense pink. So I made the code to decrease green in steps of 25 in 10 changes of color between 1 sec.

for (int verde = 255; verde >= 0; verde -= 25) {

int ledRojo = 10;
int ledVerde = 9;
int ledAzul = 8;

void setup() {
  pinMode(ledRojo, OUTPUT);
  pinMode(ledVerde, OUTPUT);
  pinMode(ledAzul, OUTPUT);
}

void loop() {
  for (int verde = 255; verde >= 0; verde -= 25) { // Decreases green in steps of 25
    analogWrite(ledRojo, 0);   // RED max
    analogWrite(ledVerde, verde); // Green gradually decreases
    analogWrite(ledAzul, 0);   // BLUE max

    delay(1000); // 1 sec between each 
  }
}

10 changes of magenta in 10 seconds

Finding the 3 main colors of the palette:

RGB	PINK	BLUE	PURPLE
Red	0	200	150
Blue	0	0	50
Green	200	255	255

I want the main colors to be pink, blue and purple. To find the palette I first wanted to find the 3 shades of this colors I prefer. After mixing a lot of values these are the 3 I like the most.

int ledRojo = 10;
int ledVerde = 9;
int ledAzul = 8;

void setup() {
  pinMode(ledRojo, OUTPUT);
  pinMode(ledVerde, OUTPUT);
  pinMode(ledAzul, OUTPUT);
}

void loop() {
  // PINK
  analogWrite(ledRojo, 0);   //  MAX
  analogWrite(ledVerde, 200); //  LITTLE GREEN
  analogWrite(ledAzul, 0);   //  MAX
  delay(2000);

  // PURPLE
  analogWrite(ledRojo, 150);  //  MEDIUM RED
  analogWrite(ledVerde, 255); //  OFF
  analogWrite(ledAzul, 50);    //  MUCH BLUE
  delay(2000);

  // BLUE
  analogWrite(ledRojo, 200);  //  MEDIUM RED
  analogWrite(ledVerde, 255);  //  OFF
  analogWrite(ledAzul, 0);   //  MAX
  delay(2000);
}

Color picks for the palette

Fading colors for a smooth change:

For fading the color change I ask chat gpt how I can make the color change better than just looping between 2 seconds with this prompt:

I have this code and I want it to change color between each code smooth: void loop() { // PINK analogWrite(ledRojo, 0); analogWrite(ledVerde, 200); analogWrite(ledAzul, 0); delay(2000); // PURPLE analogWrite(ledRojo, 150); analogWrite(ledVerde, 255); analogWrite(ledAzul, 50); delay(2000); // BLUE analogWrite(ledRojo, 200); analogWrite(ledVerde, 255); analogWrite(ledAzul, 0); delay(2000); }

I found out this is the main code why it makes the color fade after finding the intermediate color of each combination:

`void fadeToColor(int r1, int g1, int b1, int r2, int g2, int b2, int steps, int delayTime) { for (int i = 0; i <= steps; i++) {`

int ledRojo = 10;
int ledVerde = 9;
int ledAzul = 8;

void setup() {
  pinMode(ledRojo, OUTPUT);
  pinMode(ledVerde, OUTPUT);
  pinMode(ledAzul, OUTPUT);
}

// fade to color
void fadeToColor(int r1, int g1, int b1, int r2, int g2, int b2, int steps, int delayTime) {
  for (int i = 0; i <= steps; i++) {
    // intermediate color between each
    int r = map(i, 0, steps, r1, r2);
    int g = map(i, 0, steps, g1, g2);
    int b = map(i, 0, steps, b1, b2);

    // apply this value to each color
    analogWrite(ledRojo, r);
    analogWrite(ledVerde, g);
    analogWrite(ledAzul, b);

    delay(delayTime);
  }
}

void loop() {
  // PINK TO PURPLE
  fadeToColor(0, 200, 0, 150, 255, 50, 100, 20);  // 100 pasos, 20ms de delay
  delay(1000);  // Pausa de 1 segundo al final de la transición

  // PURPLE TO BLUE
  fadeToColor(150, 255, 50, 200, 255, 0, 100, 20);
  delay(1000);

  // BLUE TO PINK
  fadeToColor(200, 255, 0, 0, 200, 0, 100, 20);
  delay(1000);
}