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In this keypad lock project I have used the AT89S52 microcontroller, one of the series of 8051 microcontroller by ATMEL corp. Here I'm using 4X4 keypad to take input from the user (to enter password) and display the corresponding results on a 16X2 LCD.

Membrane keyboards, with their unique membrane circuit structure and stable and reliable performance, are widely used in various electronic devices. However, the membrane keypad price on the market varies greatly, which involves a number of factors affecting the price. This article will be from the brand impact, material costs, manufacturing processes and market demand, four aspects, in-depth discussion of how these factors affect the pricing of membrane keyboards.