Keypad Keyboard PCB (Numeric) Replacement for Trimble Nomad 900 Series

hello and welcome in this video i'm going to show you how to implement a key pad access control system using the edi sim 51. on the lcd the message enter pin will be display you then go to the keypad and type in a four digit code the key that you press will not be display but it will display uh four asterisks one for each key that you enter if you get the correct code then the message access granted will be displayed if the code that you key in is wrong then the message access denied will be displayed prerequisite i'm going to assume that for this video that is the key pad access control that you have watched my previous videos video 27 edison 51 keypad video 28 edi sim 51 lcd module video 29 revisiting edc 51 keypad and video 33 it is in 51 lcd and keypad especially this last one here the reason for asking you to watch these videos is that the contents of each of this video lay the fou