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4x3 Matrix Keypad Descriptive Essay

Keypads allow users to input data while a program is running. This tutorial shows you how to connect a twelve-button keypad to an Arduino and how to use the library Keypad.h.

A keypad is often needed to provide input to an Arduino system, and membrane-type keypads are an economical solution for many applications. They are quite thin and can easily be mounted wherever they are needed. 

In this tutorial, we demonstrate how to use a 12-button numeric keypad, similar to what you might find on a telephone. A 12-button keypad has three columns and four row. Pressing a button will short one of the row outputs to one of the column outputs. From this information, the Arduino can determine which button was pressed. For example, when key 1 is pressed, column 1 and row 1 are shorted. The Arduino will detect that and input a 1 to the program. 

How the rows and column are arranged inside the keypad is shown in the figure below.



Experiment

For this experiment, we demonstrate the “keypad.h” Arduino library. When a user presses a button on the keypad, the program will display the value the serial monitor.


Hardware Required·         

  • Arduino Mega 2560        
  • 3x4 hex keypad       
  • jumpers (optional)       
  • breadboard (optional)       
  • long pin connectors


Wiring Diagram

Connect the keypad to the Arduino as shown below.

Code


  Download Code  


Conclusion

This is a very simple example, but I think you can see how easy it is to get keypad input to your Arduino program. You can use this type of input for many different projects, including:

  • Door lock
  • Input PWM
  • Alarm clock
  • Security lock


Video


This warranty and return policy are only available for the sub categories of Arduino Compatible SCM & DIY Kits, 3D Printer & Supplies, Electronic Accessories & Gadgets.

Within 180 days

If there are any product quality problems which are not caused by artificial factors such as dis-assembly, misuse, drops or falls, water damage, unofficial firmwares, software modifications or any others causes of damage, we will cover the return shipping fees based on the shipping receipt you will provide only if these charges are worth less than US$40. 

If the damage is related to the screen, this situation should not be considered to be included in the scope of this warranty.

If the damage is caused by you, and isn't related to any product quality problem, you're still able to send it back for repairing. However, you are responsible for paying the return shipping fees and the repair fees. If there any further costs occur during the return or repair process, we will ask you to take responsibility for those as well.

We will send you a bill showing all the charges we have to pay before sending it back to you.

After 180 days from shipment

All warranty requests will be rejected after 180 days from shipment.(3D printers and ebook readers have a warranty term of 1 year)

Return Policy

DOA (Dead on arrival) items

If the product (except for DIY kits) has arrived broken, please contact us within 3 days from the day you received it and then follow the 3 Days Product Guarantee.

About unsatisfactory products

If you are not satisfied with your purchase, you can return it within 3 days from its delivery date to receive a refund of your purchase minus the shipping fees or an exchange. You will have to pay the shipping fees both ways if the reason is not related to our mistake. Please ensure to return the item with its original packaging and in the same conditions in which you received it.

3D printer problem

If your 3D printer turns out to be defective, please provide us with the following info:

  • Product ID number;
  • Order number;
  • Some photos, a video or a screenshot of the problem;
  • Description of the problem;

Your 3D Printer still works correctly:

There are lots of parts included in the package. If any parts have arrived damaged, please contact us to resend you those parts. If you're able to buy them in your country, please let us know and we will refund you the cost.

Your 3D Printer isn't working correctly:

Within the first year after purchasing, we offer free maintenance in case of quality problems (except for damage caused by incorrect use of the device. Please note that in case the damage is caused by using the machine, freight for repairing the device is required.

If quality problems occur within 45 days after receiving it, it is possible to get you a new machine.

If you dislike the item, you're free to send it back within 3 days after receiving it for a refund. You will be responsible for the shipping costs, and need to ensure that the returned product isn't damaged in any single way, and includes all original items in good condition.

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If your e-reader is not working correctly, please send us the following info:

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Within one year of free maintenance of quality problems (except for screen damage), except for personal damage (such as personal damage maintenance is required to bear the freight).

Products with quality problems declared to us within 45 days after delivery can be exchanged for a new device (except cases of personal damage and any screen related problem).

Screen damage is considered as personal damage. Customers are responsible for the maintenance (screen change) fee and bear the freight.

As e-readers are high value products, it is recommended that customers have a certain knowledge about the use of e-raders. If this product isn't what you expected, feel free to send it back to us according to the terms written down in the 'Unsatisfied with product' section above.

Notes:

  • 1. Please read the descriptions carefully and clearly before purchasing. If the descriptions are not clear enough, please feel free to contact us.
  • 2. This category (Arduino SCM & 3D Printer Acc) includes many DIY kits, and we can not assist you completely in case the damage is caused by incorrect welding, construction, or any other circuit issues.
  • 3. If you find the product is damaged, please do not disassemble it yourself (such as e-books, programmers, signal logic analyzers and other pre-built items), since this may affect your return request.

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