keypad interfacing

[@RVCEET]

I fixed the link to the handouts. Sorry about that! drive.google.com/open?id=1OSH5xolX6hEAUYEoXhaRUl4dmmvYUT8G

[@1.8millionvolts87]

Thankyou very much for this vid, you're clearing up 3 days worth of confusion with this knowledge. A true diamond in the rough. 4/10/2022

[@rraj2095]

thank you for this simple yet awesome analysis!!

[@shreyastare1113]

You just gained me 10marks more in my exams! Thank you so very much!

[@alessandrostella664]

Thank you awesome explanation. Great informative video

[@abhishekm1903]

Excellent video!!.This video cleared all my doubts.Thanks a lot.

[@rongarza9488]

Great video, Dr. Tom Lombardo. AND, the link to your Google docs is working (4/16/2019). The last line in your keyinterfacing pdf states "The diodes protect the circuit in case someone presses 2 keys in the same row but different columns at the same time". Great advice! Just out of curiosity, WOULD THE DIODES BE NEEDED IF 2 KEYS WERE PRESSED IN THE SAME COLUMN?

[@RVCEET]

Thanks for the kind words, Ron. 2 keys pressed in the same column would not cause an electrical problem. The idea is to avoid shorting two columns together because the columns are outputs; if one is sending out a 1 while the other sends out a 0, you'd be shorting Vcc to ground by pressing keys in both columns. The diode ensures that current can't flow out of a column when it outputs a 1.

[@rongarza9488]

@@RVCEET Wow, thanks Dr. Lombardo, good thing I asked. I'll set up a test using only one column at a time.

[@jeffnay6502]

The only thing missing is the coding of the Microprocessor ??? Did I miss something here?

[@andreagosto5099]

Can I applied these same principles to an arduino uno project? I need to design and make a 30 keypad with an arduino uno.

[@michaelluftenegger7618]

can anybody explain me why the input pins are not pulled up anymore in the last screen? Or is there something I missed? regards, michael

[@warispark7733]

Did you get an answer?

[@joegancher3720]

The problem I have with this remedy or method is that it's polled I/O,,,,, it ties up my micro and even if I allowed it, a substantial interrupt service routine would cause missed keystrokes. Wouldn't an interrupt based solution be better ?

[@rakeshgupta-nh2hu]

We need this type of work engineer which make matrix keypads

[@RSuarez66]

The link for the handouts is broken. :( GReat video.

[@perivesta]

Thanks a lot, you saved my life! Brilliant video :D

[@FlavourlessLife]

Excellent video! Cheers!

[@lylerodericks]

Thank you!

[@muskanprajapati7281]

perfect explaination

[@MDFRESCUER]

Nicely explained.

[@nicelifekavi]

Nice tech thank you sir

[@yxhankun]

where is the sketch in arduino from your google drive?

[@RVCEET]

I don't have any Arduino-specific material. The keypad scan is a generic algorithm - it works with any hardware.

[@vikasns4603]

beautiful

[@zardouayassir7359]

thnkyou ! :)

[@asaaprabhat3489]

thanks

[@joegancher3720]

I had to really strain to hear this. we can always turn them down but when our volume is maxed out ..... Seems to be a great vid otherwise.

[@jasonbrassett8130]

Thank you!