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issue of the arduino projects program is coming out,

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by this time we already have the

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first 1000 subscribers on the channel, for which

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we can be congratulated, and I also want to

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express my gratitude to everyone for

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watching our episodes and thereby

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learning a lot of new things, but today we

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will talk about such a matrix keyboard

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and connection to our board, and

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we will also look at several interesting circuits

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with its participation. I

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also recommend that you visit the website of your

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hobby.

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there you can find interesting articles on

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robotics and also buy components

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for arduino, including those that

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use in their lessons I

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will leave a link in the description but we are starting

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now in front of us is that same

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matrix keyboard, in my case it is a 16-

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button keyboard because it has

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four lines and 4 columns By the way, you

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can make it yourself and for this we

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need a printed circuit board like this and

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several buttons 12 or 16, but also plus

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connecting wires, why is

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this module needed? For example, let’s take a regular

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button like this, like you know, this is the

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simplest

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electromechanical device to

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connect it to the board we

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only need a pull-down resistor

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and also 2 contacts 1 contact

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power and ground contact then with such a

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button you can perform a certain

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action, for example we can control the LED with

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various drives, engines,

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mechanisms and so on, we

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need to connect several buttons

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then we will have to use more

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contacts and more cities

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and you can’t do without a breadboard here,

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plus you’ll have to

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use resistors in larger quantities,

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you’ll agree that they don’t provide convenience, that’s why they

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came up with

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a keyboard like this to simplify connecting a

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larger number of buttons,

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such devices are found everywhere,

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for example in a calculator or

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computer keyboard connect such a keyboard,

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at least in my case with eight

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pins, each of these pins

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reads a value from certain rows

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and columns,

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these pins should be connected to the pins

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on the digital panel on our board, I will

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connect them to apply to pins from 2

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to 9 inclusive 0 1 which is located

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here very much and can be used since

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they are intended for the uart interface and, for

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example, for connecting a bluetooth

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module and it would be more rational to leave them

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free just in case, but this is what the

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simplest diagram using

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this module looks like and also for more convenient

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work with it it was written there is a special

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library called keypad, you can download

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it as well as other sketches for this video and

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other libraries using the

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links in the description, and then

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after you have installed the library, you can

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go into the game and on the IP and see the

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examples that are offered to us

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in the example Let's take the simplest

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example for reference; this example allows you

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to read a value from the keyboard when you

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press a certain key and output

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this value to a port. In this case, it

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will be a port monitor on the computer, that is,

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if we press

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the number 1 on the keyboard, then ch1 will

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appear in the port monitor.

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the sketch here is essentially very simple,

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the only thing worth noting is the

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first lines of code, first we

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include our library using the

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include function, then we indicate

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how many rows and how many columns our

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keyboard has, in my case it’s 44,

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then we need to correctly position

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the name of our keys to make it more convenient to

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use keyboard, if you

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do this incorrectly, then when you

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press ch4,

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the number 6 or any other symbol may appear on your port monitor;

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in fact, it is better to determine experimentally

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experimentally, which is what I did and

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thus arranged all the symbols

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as they are indicated as they are located on

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my keyboard then also needs to

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indicate which pins on the board we

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connect to control rows and

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columns,

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that is, these are just our pins from 2

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to 9 inclusive,

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then we have a mandatory function

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called led, in it we indicate the speed of the

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serial connection, that is, the

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data transfer speed with pact monitor

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as 9600 baud or bits per second, in fact,

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this function is only needed to supply

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power to the module, then we go to

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such a mandatory function in this

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we prescribe the conditions there, we use the

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variable cha, which is used to

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store only one character, that is,

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one byte

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for example, it will be 1 or a or 5, that is,

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some specific symbol is

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appropriate for our situation and

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then we set the conditions, that is, if

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pressing it was fixed,

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then the symbol is output to the

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port monitor, this happens using the function

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serial you screw the brackets in this function, you

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must indicate which

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variable you are outputting to the port, if you

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did everything correctly, then in the port monitor we

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will get that symbol ready we clicked;

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also, do not forget that in the port monitor at the bottom

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right you must also indicate the

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data transfer rate

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that we indicated in the sketch then there is

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9600, but let’s say we don’t want to connect

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the board to the computer to see this data,

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let’s then display it on the display,

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I will use for this purpose

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the display associated with the Washi modules site,

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this also simplifies the connection because

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it reduces the number of pins

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16 to 4k displays and this module

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cannot be viewed in the twelfth issue,

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for an ipad with a bus display from bc, you

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also need to install a special

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library, a link to it will also be in the

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description under the video,

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so the sketch and we will indicate it to the

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include functions. After installing this

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library, we can start doing the sketch; we will

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also use the previous sketch as a

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base one and supplement it with the condition

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that we will connect the display,

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so here are the sketches, we indicate the library

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using the include function, that is, now we

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already have two connected libraries,

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then we indicate the display size,

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my display contains 16 characters in each

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of two lines,

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I indicate this further with us the following

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function will sit here we will

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only add that we will supply power to the display and

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turn on the backlight for this we have

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two functions lcd begin and lcd backlight but

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in order to display this data on

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the display we must find our function

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howls whoop find the conditions there and in Here we can

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write out the function sit point, which

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serves exactly to display data on

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the display.

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We can also set the position of

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the cursor, that is, from which place on the display we

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will display the symbol. For

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this, we write 2 numbers in brackets while 1

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indicates the number of the symbol of the author, this is the

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number lines,

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and you also need to remember that here the

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countdown starts not from one, but from zero,

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that is, here there are lines under us for

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the scale 0 and 1, they are 1 and 2, as it may

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seem at first, in principle, this is where

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the sketch ends, we load it into the

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board using usb cable and let's see

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what will happen, this is what the circuit looks like, assembled

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on the basis of the sketches we wrote,

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the only change here is a

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naturally connected display, it

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is connected with four

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outputs, two of them are pins for

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connecting barely syntax with and

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with the purpose,

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they are connected respectively to the

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analog output on the board they

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are called a4 a5

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well, and also two with two jumpers, we have

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power and ground connected, now let's

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see how it will all work, for

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this we will supply power, it is advisable to power the

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board from 9 to 12 volts, as we see in the

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clock displays there is a backlight,

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let's try to type some symbol on

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who in the end,

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for example, is 9 and as we see it is

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displayed, press 8 and

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the numbers eight will appear on the display and as we see it

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turns out that if you move the symbols

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further, then each previous

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symbol will be erased and a

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new one will appear in its place, as in our case

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so if you want to enter symbols,

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then you just need to delete the sketches

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where we indicated the position of

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the cursor and then we can simply run

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various symbols on the keyboard and they

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will not be erased, but you will get one big

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long number, and accordingly, if

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you want to stitch our link, then we we

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just have to press the

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reset button on our fists and then the

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line itself is just on the street. Well, the

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last scheme for today we will have to

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perform a certain action when you

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press a certain key on our

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keyboard, which is why we actually all

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gathered here, but I’ll immediately note that

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There will be two issues on this topic at once and

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the next one will tell you about more complex

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and interesting circuits, and in this issue we

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actually get acquainted with our module and

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remember the construction of the code from all

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uses, so now we’ll try to

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turn on or off

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the LED when you press a certain key on the keyboard. Naturally,

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we will connect the LED to our board, I will

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use a breadboard for this, the

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LED itself and a 220 ohm resistor can be

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used from 150 to 220 ohms if you have

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just such a resistor, you also don’t need two

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jumpers with which I will close

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the circuit by

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connecting them to the power pins by the way it

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will be powered from the 12 pin to which

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the LED is connected and the ground pin is

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here, so let’s immediately see this

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circuit in action and then we’ll look at the

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sketch,

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that is, and again I supply power to the

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LED, we don’t goget and so I’ll press

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key 1

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if you’re an idiot it lights up I press at 2 it wo

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n’t light up,

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basically everything is logical, but now let’s

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look at our huge cat as a basis, we

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’ll take our very first sketch and just

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added it at the beginning, using a very

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useful function called define, we

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’ll assign a name to the LED connected to pin

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12, but let’s call it for example,

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lapin functions volt setup we specify

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the signal from the LED as an output. By the way,

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if we did not use the

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keypad library, we would have to write the

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same thing for our eight pins with

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which our keyboard is connected,

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you will agree that this causes inconvenience,

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then we have the function howls whoop there

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there is a condition and here we

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press a certain key when they enter it

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to the value of the variable kei, that

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is, on whatever symbol we press,

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this is all we have the value of the variable kei,

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then we must write about the pirates

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switch it is required in these diagrams

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these sketches of the candles will compare the

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values change key and give

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certain commands depending on

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this value, it consists of two

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auxiliary operators, one

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is called case from and hand is called

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break things saying if the

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value of the program unit variable is found

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as we have written in the sketch, then the

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action will be performed, namely

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the LED turns on if

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this variable will not be found with this

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value, then no action will be

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performed, there will be no peak, so break

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services just to exit the

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case operator, respectively, when we

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click on one, we will perform the

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maximum voltage supply to our

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LED, it will light up, when we click on

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2,

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it will not light up this will be all we

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indicate the functions digital and it die in

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brackets the name of the variable is given and

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instructions to it accordingly the name of the

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variable is here is the pin and the indication can

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be the maximum feed or the smallest,

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that is, a hack or y, you can

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write specific commands for each

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button in this way, that is for all 16 buttons and

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you can control a large number of

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LEDs, even 16 or 30, and

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you can generally create one command for

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all LEDs at once, or

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vice versa to turn off all LEDs,

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but by connecting LEDs and other modules, you can

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control not an LED, but a light bulb

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which will be powered directly from

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the network, that is, 220 volts,

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this sketch ends here; it is, in

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principle, quite simple to understand

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and now all that remains is to once again

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enjoy this circuit made of cotton wool; I press

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one, the LED lights up;

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I press two, it stops lighting;

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everything is basically logical and quite understandable.

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this is the end of our issue, I

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hope that you liked it and was

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useful for you, but also do not forget that

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soon there will be a part of this

00:15:01

issue where we will look at some more

00:15:03

interesting schemes, also do not forget to

00:15:06

like if you liked this

00:15:08

video, do not forget to subscribe on the

00:15:10

channel, also go to our group in

00:15:13

contact, a lot of

00:15:15

interesting news and a lot of useful

00:15:17

information are also published there. Also, don’t forget to go

00:15:19

to your hobby website. I

00:15:22

hope you will also find a lot of interesting things in this

00:15:24

and see you in the next

00:15:27

issue

Description:

Присоединяйтесь к нашему сообществу: https://vk.com/arduino_blog Разработка и скетчи Arduino на заказ: https://vk.com/wiresdesign Что такое матричная клавиатура? Подключение к Ардуино ( Arduino ) и управление ей. Сегодня рассмотрим несколько простых схем с использованием дисплея, светодиодов, понятных даже начинающим, и изучим структуру программного кода я с использованием этой клавиатуры. Скетчи и библиотеки тут: https://yadi.sk/showcaptcha?cc=1&mt=2DCFF94EDE4D9E7061253EB12B7C4B3623BF16712D93BF5FEF03A050A94D103A13DD3BDC235AA3D1E7C395EB0E527B66B0BE582154BF546863330EDCDB8239275B87BC30B7300CF793B4ECE362D16B09EED69FBED1F0A2DFA13BC8F77CFDBECA33A9912698765FA3D61B1715B0A35840564D74FDC692158400060B97FE4F374C3CEFAF654BD9BCAC9D0A56EF331BAC83731738FE7ECACF5D6C7FC1ED4C7C514A1A6B1FA8A8D1CA11E2731E33AE9446563CE9E4C6A8C739234701F71067B52AFAC76558D6CDEC971013E7BCB60769EA944F9E5C8B8C3F88B2CD471493&retpath=aHR0cHM6Ly95YWRpLnNrL2Qvall3ZHdTM1UzRVo3Ykc__8d72c3690271108c6425effc42d31c93&t=2/1717344351/feb0d930e377c28352e27edfb8239261&u=8ad9a484-c7f1b717-3ec77045-c54f9406&s=ed31fe2633b4f0d17b8defdc5d3c4d78 Смотреть вторую часть тут: https://www.youtube.com/watch?v=AIL0A5hgEy8 Статья, дублирующая видео: https://edurobots.org/2017/03/arduino-keypad/ По всем вопросам и предложениям: https://vk.com/don_arturos Подписывайтесь на наши социальные сети: Facebook — https://www.facebook.com/unsupportedbrowser Telegram — https://telegram.org/ VK — https://vk.com/arduino_blog

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