Temporary Price Reduction! Due to a miss-measurement on my CAD files, the Printed Circuit Boards (PCBs) for this kit have the last row of pushbutton switches hanging off the bottom of the board. These boards do work, it's just that the buttons extend off the board a bit. You can get a working hex keypad for half off the normal price, until the miss-measured boards run out. Hurry, this can't last very long.
This was designed for building, and experimenting with, retro computing projects. With the old computers, they were often programmed in hexadecimal, and the 10-key telephone-style keypads did not fit the bill. In addition, when I was able to find 16-key keypads, the numbering was designed along the lines of the telephone-style keypad, and was not fit for quick hexadecimal data entry.
This keypad kit will enable you to plug a hexadecimal keypad directly into your breadboard. This will quickly allow you to design user input into your project. As a hexadecimal keypad, this is a perfect fit for entering hex data directly into a microcontroller, or a classic computer. The keypad is arranged in an X-Y matrix with the rows and columns brought out to the nine pins at the top of the keypad.
Following the table below, and the diagram picture, when the “5” key is pressed, it would short together pin 4 and pin 7 on the 9-pin connector. The remaining pins are left unconnected. By having your computer scan the columns by placing a high on each column, one by one, and then reading the row pins, your system can tell which key is pressed. You would also need to account for keybounce with a short delay/retest subroutine.
This is how the pins are wired: Pin 1 (the left-most pin) is ground Pin 2 is connected to the bottom row Pin 3 is connected to the next row up Pin 4 is connected to the second-from-the-top row Pin 5 is connected to the top row Pin 6 is connected to the left-most column Pin 7 is connected to the next column to the right Pin 8 is connected to the second-from-the-right column Pin 9 is connected to the right-most column
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Welcome to the Granzeier Consulting Tindie Store. I am Art Granzeier, and my company produces kits and packs for budding engineers. Most of my target market is (supposed to be) high-school, college and young adult students who are interested in, or are working in EE (electronic engineering.) My secondary market (or at least it should be secondary - but mostly this is my primary market, at least until I get going enough to market to schools and school groups) is electronics/robotics hobbyists and non-electronics engineers who want to learn more about the electronics discipline.
I have a few text books that are nearly done, and a few more that are on their way. Once these are done, they will be offered with appropriate kits which will cover the lab work for the course. My ideal here is to get to be like the old Heathkit courses (on a more modern point, Andy Lindsay, from Parallax, does a pretty darned good job of writing, and I try to emulate him, with my own slant/point of view, somewhat.) I have been teaching, professionally, on and off since 1989, and have written a lot of my own course/quiz/exam material, so that is what I am using for my textbooks.
We ship, at least, every Monday and Thursday. Heavy ordering will prompt additional shipments.