Klawiatura 4*4 AD Keypad

Dostępność: dostępny
Wysyłka w: 24 godziny
Cena: 14,90 zł 14.90
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Producent: WaveShare
Kod produktu: KAT00042

Opis

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.


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
  • Abbreviation
    • 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.



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Features


16 push buttons, detection interface

 

 

Tabela zgodności modułów


Check out the compatibility between "Accessory Boards" and "Development Boards"

 

Tabela zgodnosci

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