Keypad Talking To LCD Via AT89S51

In few previous post, I showed schematic for interfacing Keypad and LCD using 8051 architecture. This blog post shows complete implementation of the interface using AT89S51 Micro-controller with programming in assembly. Considering that one understands the technical background for Keypad and LCD. Now, follow the schematic given above and solder th
Keypad Talking To LCD Via AT89S51 - schematic

e components on the General Purpose PCB : Note : While doing so, first solder LCD and check if it works properly by uploading the code to display the characters and the move on to Keypad phase. Doing in phases helps. Now cross check the connections and also make sure that LCD`s brightness is controllable with the pot when the system in powered using a power supply. Supply voltage in this case was 5 Volt. Next step is to upload the code for capturing Keypad data and to display same on the LCD. I would encourage individuals to write the code on own, hence not sharing here. And after the code has been burned, place the AT89S51 on IC socket and test the system, whichever key is pressed that key should be displayed on the LCD :

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