Klawiatura 16 przycisków AD

16 buttons controlled by only 1 AD port 

Overview

The AD Keypad provides 16 push buttons, and takes up only 1 AD port for controlling. It's suitable for applications where the AD ports are sufficient yet I/O ports are lacking of.

Features

16 push buttons, detection interface

Photos

Parameters and How to

Parameters and Sampling

• AD ideal value: when button pressed, Viv = (button index / 16) x Vref
• AD real value: when button pressed, Vrv = (1 ± 6%) x Viv
• For instance, suppose Vref = 5, 8th button was pressed, then Viv = (8 / 16) x 5 = 2.5, Vrv = (1 ± 6%) x 2.5, equals to 2.35-2.65

Vref: AD reference voltage
iv: ideal value
rv: real value

How to detect and handle in your code

For 10-bit ADC, the 8th button generates ADC value between (1±6%)x512, the equivalence of "481-543". If the ADC value had been detected to be "510-518" in the code, the 8th button's supposed to have been pressed.

For 8-bit ADC, the 8th button generates ADC value between (1±6%)x128, the equivalence of "120-136". If the ADC value had been detected to be "124-128" in the code, the 8th button's supposed to have been pressed.

Package Contains

• AD Keypad × 1

Downloads

Development resources: demo codes, schematic, datasheets, etc.Click here to download