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We are going to see how we can use this four by three keypad to get the data on the screen, something like that. One, five, eight or any number that is pressed. You will see it. You can get the code and I’ve ready for this project by clicking at the link of the description below which will take you through Jack’s accomplish, learn flash or do we know let’s get started with this you, as you can see, we can insert DuPont wires hair That makes it very easy for debugging prototyping, but when I remove it, the spaces are equally aligned for 2.5 4 millimeter for this type of DuPont, so that will make it very easy. This is very flexible and the just wiring is also flexible, handle up to certain bending, but more than that it might break I’ve not tried it. So be careful with that and as you can see, we have are using it as a button. So we have 12 keys and for 12 keys. If we make that one of the wires have a common, then then we have 12 wires, plus one common will be 13 wires. But now this has been done with seven that’s. Why we are using and we are detecting the row and column, for example, when you press to actually go in first through second character and then second column second character will be detected. So that way, the same wire is used for 0, 8, 5 and 2, and then these wires also will be used.

For that reason, we have one. We have one wires, two three four wires and there one two three that’s why we have several wires here now: let’s have a look at the wiring. The wiring is very simple: the array that I’ve arranged and could will make everything easy just follow these lines. This is at office, not that size on the top face, and all these wires from this side of this star is connected to pin 2 and so 4. 2. 3. 4. 5. 6. It comes up to pan 8 because here we have 7. Let me now explain the code. The religion could have been taken from playground, dot or the Gerudo CC could keypad, and so here is also the name that was there. I just left it as it. Yes, I will give you the link for the library, so you can download it once you download it. You will have in your example and keypad. You will have multiple of these and just giving you one of the examples here, so you can customise it. The same way, just bytes row will give you four and those that you have on the device and three is the number of columns. So these are rows: 1, 2, 3 amp 4 and then we have 1, 2 3 column and then accordingly fill this up. The first row is 1, 2, 3 and then 4, 5, 6 and the last row is store and hash.

So you felt that up accordingly, and here are the the array that is holding rows and column and you have to enter it the same way that I’ve shown you through the wiring so 2, 3, 4, 5, 6, 7 amp 8. And then we create an SS of objects from this class keypad and then this is now our keypad object. We pass the array of the keys, this one and then draw column, and then one array and the other array, so we are passing these row and column and then drew and column of arrays. So this class can work on that now it is 600 bodies. The speed of this serial monitor is must match, and this is just a text after that, the loop we check, keypad dot, get key. If this gets a value, the value will be stored as a character here, and then we check if key or a character exists from this on the screen you you can play with this and, for example, you can check a key like this. The key is holding the key that the person press what is pressed so, for example, if you want to check if key, if equal for equal equal for this to equal means compared and then you must put single code to refers to as character. Otherwise, double code would be for string and then, if you don’t put any code, it would be an integer. This is not an integer because you have defined it as character because we have all other characters so that’s why it must be defined as car or char.

So the car will be able to hold all including those other letters, so we can check if key, that is press equal four, then we plan to run this, so you can do the combination of codes like some kind of lock or something and then every time That’S pressed let’s say you create a code that accepts four digits or four characters and then do some action if four characters or enter the code digna. For example, two five: eight hash should open the door or something so you can put them in an array and collect it from the user and then check it. If it is true, then do some action here. For example, you can put real a solenoid to open the door or send a text or turn on something or turn off. Something here is a demonstration when I press any button. It just goes and also in terms of speed. You can slow it down or make it faster. For example, if you add a delay, so one two, if I press it as you can see one or two of press, five, five, five five and then six nine hache, eight star seven. All of those will be fast, but if you, but also you can add, delay between this on the loop. So if you have some delay of 100 millisecond, the user must wait a certain amount of time before pressing the other one, but I just put it in normal, so you can change it accordingly for your application.

Thanks for watching this introduction on how to use this four by three keypad for Arduino, please make sure to subscribe, so you can get out this of my upcoming videos. If you have comments or questions, please, post the description below also follow us on Facebook.


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