Klawiatura 16 przycisków AD
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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
