8051 keypad and LED question
Discussion in "Project Help" started by fortresmaximus Aug 30, 2023.
Wed Aug 30 2023, 11:53 am
Hi guys, i am new here.
I need to create project with microcontroller 8051,
in project i want to use KEYPAD-PHONE and 4 LED (for example if i click 1 on keypad - first LED will light up,
Could someone give me a hint what i am doing wrong?
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I need to create project with microcontroller 8051,
in project i want to use KEYPAD-PHONE and 4 LED (for example if i click 1 on keypad - first LED will light up,
Could someone give me a hint what i am doing wrong?
[ Edited Wed Aug 30 2023, 11:57 am ]
Tue Sep 19 2023, 07:49 am
To use this kind of keypad you must "scan" it,
This means setting pins P2.1,P2.2 and P2.3 high then low one after the other.
Your pins do not change, so pressing a key does nothing.
This means setting pins P2.1,P2.2 and P2.3 high then low one after the other.
Your pins do not change, so pressing a key does nothing.
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