Keypad Program

Hello!
On Sunday I wrote a program for the display and keypad. We had to try several times to get the program right, and on one try, we installed pulldown resistors, which if a button is not pushed then it sets it to a known state. First we had to write out simple instructions on paper, then we had to translate it into code that the Arduino could understand. Here is a picture of the paper code:

Here is a picture of the wiring up process, well, really two:

                                                                         (Close up)

Here is the code:


// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
const int keypad_columns[]={0,A0,A1,6,7};
const int keypad_rows[]={8,9,10,13};
 //arrays start with zero
 int col;
 int row;
void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 4);
  Serial.begin(9600);
  // Print a message to the LCD.


  //set columns to output
  pinMode(keypad_columns[1], OUTPUT);
  pinMode(keypad_columns[2], OUTPUT);
  pinMode(keypad_columns[3], OUTPUT);
  pinMode(keypad_columns[4], OUTPUT);
 
//set columns to low so in a know state
  digitalWrite(keypad_columns[1], LOW);
  digitalWrite(keypad_columns[2], LOW);
  digitalWrite(keypad_columns[3], LOW);
  digitalWrite(keypad_columns[4], LOW);

  //set rows to inout
  pinMode(keypad_rows[0], INPUT);
  pinMode(keypad_rows[1], INPUT);
  pinMode(keypad_rows[2], INPUT);
  pinMode(keypad_rows[3], INPUT);


}

void loop() {
  //loop through # of colunms.
  for(col=1; col <= 4; col++) {
    digitalWrite(keypad_columns[col], HIGH);
    for(row=0; row <= 3; row++){
    if (digitalRead(keypad_rows[row])==HIGH){
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("button  ");
      lcd.print((4*row)+col);
      }
    }// end of row
    digitalWrite(keypad_columns[col], LOW);
  }//end of col

}//end of void loop





Over & Out!
Elise

Sketches

Sketches are the programming, or code, that tells the Arduino brain what to do and when to do itt. The most important parts of the window are:

1. Workspace: The workspace is where you physicaly type, write or open a sketch.
2. Upload: The button that sends the sketch to the Arduino brain.
3. Save: This is SOO important! It is vital to save your progress every couple of minutes so that if your computer shuts down, you are just a click away to finishing, or uploading you sketch. 

Here is a picture!!!

Over and Out!!!

Elise

Parts and Pieces

Hi!

Today I am going to tell you a little bit about other parts and pieces that can be added on to an Arduino board. There are things like sensors, LED’s, buttons, switches, and even different boards that can be attached so the board can do many more things! Let me tell you more about them.

Sensors

Sensors have many cool uses, like burglar alarms, and even light shows! Here are some examples of sensors, what they do/are, and pictures!

Temperature Sensor- A temperature sensor can tell what temperature it is in the area or room around them,  and if a room gets too hot or too cold, you can program it to make a noise if you hook a noise maker up to it. Here is a picture:                              

Flex Sensor- A flex sensor tells the board if it should send a lot of power of energy to a LED or display, or just a little bit. It tells the Arduino how much power to send by how much it is being bended or pushed. It looks like this:

Light Sensor- A light sensor is used to tell how much light is in the area or room that is in, and it will tell the Arduino brain to turn on a light, make a noise, turn off a light, etc. Light sensors are often used on the little lamps that people sometimes line their walkways with and when it starts to get dark, it will turn the light on! Here is a picture of a light sensor:

Motion Sensor- Motion sensors are my favorite sensor of all. They are typically used in burglar alarms, and can also be called PIR sensors. They have a range of sight, which can be very small or very large, and this often contributes to the size. A fun way that motion sensors are used is for light shows. Around the holidays, people sometimes program light shows that are activated when cars or people go by.  They tend to look like this:

There are also buttons, switches, and potentiometers that can turn up a volume, make something on a display go faster, or turn on, off, or even dim lights or LED’s.

Buttons- Buttons are very common in everyday life. They can be seen in elevators, cash registers, doorbells, and lots of other places! When a button is pushed, it sends a signal to the Arduino to turn on a light, make a noise, etc. They look like this:

Switches- Switches are seen everywhere, and in almost every building too! They can turn on a light, which completes a circuit, turn off lights, and not just lights, switches can turn on or off just about anything! When a switch is flipped up or down, it sends a signal to the board to do something, like turn something on or off. This is what it looks like:

Potentiometers- Potentiometers are small, stick like things that can turn left or right, which dims lights displays, and other things that brightness can be changed.  They also can turn up or down volume, and even temperature. It can rise or lower anything that can be risen or lowered. It looks like this:

That’s all for now! I hope you learned more about other parts and pieces that can be added onto the Arduino microcontroller!

Over & Out!

Elise

History

In 2005,   Massimo Banzi, a teacher at the Interaction Design Institute, wanted to make an affordable way for his students to create their own electronic projects.  He wanted them to be able to program the board fast and easy. Along with Massachusetts Institute of Technology, Massimo Banzi and his colleagues worked together to create a easy to use programming language that was free and everybody could use it. 

The team wanted the Arduino to be unique, so they made the color blue, not green like the other circuit boards, and personalized it with a picture of Italy, where the IDII is located. Also, they made it so that it would have more Input / Output slots, so it was easy and simple to add things onto the Arduino microcontroller. When it was ready, the team gave the prototype to 300 students and told them how to build it and that they had to build and program a project.

Since 2005, Massimo and his team have sold hundreds and thousands of not only Arduino UNO boards, but Arduino Due, Mega, Nano, Lilypad, and many others. Other universities have admired the easy programming language and simple, fast way to build useful things.

That's all for now!

Over & Out
Elise

Binary

Hi!
Today I am going to talk about binary. Binary is written as a series of ones and zeros. The highest number that can be represented by one byte is 255. A byte is eight bits, and four bits is called a nibble. Whoever came up with those names must have had food on the brain! That number in binary form is 1 1 1 1 1 1 1 1 . If you wanted to write 14 in binary, it would look something like this:

128   64   32   16   8    4    2    1
 0        0     0     0    1    1    1    0

So 14 in binary is 0 0 0 0 1 1 1 0.
If you wanted to write 97 in binary, it would look like this:

128   64   32   16   8    4    2    1
   0      1     1     0    0    0    0    1

So 97 in binary is 0 1 1 0 0 0 0 1!

If you were wondering what the 128,  64,   32,  16,   8,    4,    2,    1, is, they are the place values of each number. 128   64   32   16   8    4    2    1 are the place values of each number, so if you go through the numbers one by one, you can figure out how many times that number is represented in the number you are turning into binary. But remember, you can only use each number once, and if you do not need a number to translate the total number into binary, you have to write a zero or the computer will think you are writing a smaller or bigger number than what you really are.

This morning, my Dad and I were working on binary! Here is a picture of what we did!

That is all for now!

Over & Out,
Elise

For Loops

A for loop is a loop that you can get out of/it will eventually end. It consists of three parts, initializing, conditional test, and iteration. Initializing assigns the variable with a known value. The conditional test checks if the current value of the variable is either greater then, less then, or equal to a number, and iteration is something done each time when the loop is complete.

A example is:
For(int z = 5 ; z <= 7 ; z++)
{
// do something here
}

In the above example, the variable z is being assigned to the value of 5, and it will loop through 3 times, because z++ is adding 1 to the value of z each time, so after 3 loops. the value of z will be 8, which is greater then 7, so the conditional test will turn out false, stopping the loop.

Also, below is a picture of what I wrote in my notebook!

Over & Out!
Elise

Interview Q's & A's

Hello!
Yesterday I interviewed Elecia White. It ws fun and very interesting to learn more about her and her job. Below are the questions and their answers.

Questions for interview.
1. What do you do? Do you have any other jobs? If so, what are they?
She is an embedded software engineer, and has worked on toys, race cars, and is an author. She also has a podcast.

2. In what way did this type of work interest you and how did you get started? 
 She went to small engineering science college. Her 2 favorite subjects were computer science and math. Being a system engineer made her happy because when she first made a motor move because she told it to, she said it felt magical.

3. Who would you say has been the most help in your career? How did they help you? 
Her husband, because he works in a similar job, so being able to talk to about problems makes them easier to solve.

4. What kinds of problems do you deal with?
Puzzles,because some of them are fun, and when frustrating puzzles are solved it feels good. People and puzzles are her main problems.

5. Do you find your job exciting or boring? Why?
25% exciting, 10% boring, and 65% interesting.

6. Is multitasking a skill that is required for this job?
Computers multi task, and they switch back and forth so fast people cannot tell. People can switch like computers, but when doing a hard problem they need compete focus on the task at hand.

7. What projects have you worked on that have been particularly interesting? 
Dna scanners, leapfrog toys, fitbit are all things she has worked on. She has also worked on the shotspotter, which detects gunshots in city and is very accurate when it tells the police exactly where it is. She likes knowing that it saves lives. She also made a ring that shows strange words when she taps it because she likes strange words.

8. What is a typical day like?
She plays with computer, tests outside, and think about what will do tomorrow. She also has lunch with friends.

10. What are your hobbies?
She likes to read all types of stories, has a podcast, writes a blog,

11. Did you have any other career choices?
She wanted to be a marine biologist, or journalist, has been manager, wrote a book but writing is hard work so Elecia said that she is glad she did not become a journalist. 

12. How does a person progress in your field? What is a typical career path in this field or organization?
A typical career path is to go to college, become a tech assistant, then become the person who tells the tech assistants what to do and helps them do it, and finally, a manager. 

13. What is the best way to enter this occupation?
College, robotics clubs, and other robotic groups and activities.

14. How would you describe the working atmosphere and the people with whom you work?
Sometimes quiet, because everybody is all focused so they can go home and do other things, and it sometimes noisy and playful. She likes to work with happy people.

She made a really big difference in my project, and I would like to say THANK YOU! Overall, she helped me see that even if you face problems in your job, when it is finished or solved then you feel good. Also, even if you face problems sometimes, your job can always be fun.

Over & Out

Elise