Keypads

In this video I'll take a look at the wiring and code required to use three different common keypads as inputs to your electronic projects.
Wiring Diagram: drive.google.com/open?id=1N_n...
1x4 Membrane
£0.50 from www.ebay.co.uk/itm/2PCS-1x4-M...
Code: drive.google.com/open?id=16tT...
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01:14 Introduction
02:39 Code and Wiring + Description of INPUT_PULLUP
09:12 Demo
3x4 Matrix Membrane
£0.50 each from
www.ebay.co.uk/itm/2PCS-Matri...
Code: drive.google.com/open?id=11ve...
---
09:51 Introduction
11:15 Code and Wiring
14:25 Demo
4x4 Matrix Keypad
£2.00 each from www.ebay.co.uk/p/4-X-4-Matrix...
Code: drive.google.com/open?id=1ZTG...
---
14:51 Introduction
16:03 Code and Wiring
17:37 Demo

[@WVMbe]

Thank you for this video, I was looking for a clear explanation for some time. Exactly what I needed!

[@digitalartee]

Great vid! More please. Thank you!

[@greystorm9974]

I run the membrane ones in our 10 in house and 10 out of house escape rooms, with at least 12 room bookings a week, and I only ever at had to replace 1 keypad. Color me impressed.

[@AbdallaNizar]

Awesome explanation, much appreciated.

[@sidharthv]

Great explanation. Thank you!

[@nekelly123]

Very helpful, thank you.

[@emiltoteb]

Hey, I was wondering if I can use the Keypad library for the first membrane keypad, having only one row and 4 columns? Thank you!

[@deniss8892]

best what i found

[@mvl8209]

Can this code (or similar) be used on a Raspberry Pi 4B, or would everything have to get rewritten completely? This would be a great test for using the GPIO pins (As of now in my current setup, they are only used for a fan)

[@joseurbina6655]

new subs. thanks

[@omkarraut5045]

I am doing an analysis , But am stuck in one issue, i'm not able to take a 4 digit value from 4x4 keypad and send it to google Firebase
Can anyone please help me out? Please i need in urgent

[@junehanabi1756]

I much prefer pull-down. I get that buttons and stuff are uber commonly pulled up where zero means pressed and one means not pressed but it doesn't feel intuitive at all to me. A one makes much more sense to mean pushed than not-pushed. That's why I really prefer to ground everything and check for positives or ones to mean activated/pressed. It feels way more intuitive that way. Not sure if you can do something like that though with these keypads.

[@PlayfulTechnology]

For all practical purposes, you can use either. Pull-ups are the standard, and were required from historic TTL circuitry days. I prefer them because I'd rather have long ground wires run to distant switches, keeping V+ close ti the controller, than having long V+ wire runs which are more susceptible to accidental grounding. Treating the input as HIGH/LOW ON/OFF is a trivial swap.

[@rongarza9488]

Wonderful clear examples, with links to sketches provided! Thanks. Just out of curiosity, what happens when more than one button is pressed? (No fool proof system has ever taken into account the ingenuity of a fool. -- anon)

[@rogeliotorres1588]

What type of job would someone pursue if they enjoy this type of work?