16 Buttons Ad Keypad Keyboard Module
China 16 Buttons Ad Keypad Keyboard Module, Find details about China 16 Buttons Keyboard, 16 Buttons Keypad from 16 Buttons Ad Keypad Keyboard Module
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 choose
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
| ADC Value Detection Range | Measurement Data (Vref=3.3V) | Measurement Data (Vref = 5V) | ||||||
|---|---|---|---|---|---|---|---|---|
| Buttons | 10-bit ADC | 8-bit ADC | Real Value Sampling (V) | Error (V) | Ideal Value (V) | Real Value Sampling (V) | Error (V) | Ideal Value(V) |
| 0 | 0-4 | 0-1 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | (1±6%)x64 | (1±6%)x16 | 0.2054 | -0.00085 | 0.20625 | 0.3112 | -0.0013 | 0.3125 |
| 2 | (1±6%)x128 | (1±6%)x32 | 0.4117 | -0.0008 | 0.4125 | 0.6238 | -0.0012 | 0.625 |
| 3 | (1±6%)x192 | (1±6%)x48 | 0.6233 | 0.00455 | 0.61875 | 0.9444 | 0.0069 | 0.9375 |
| 4 | (1±6%)x256 | (1±6%)x64 | 0.8242 | -0.0008 | 0.825 | 1.2487 | -0.0013 | 1.25 |
| 5 | (1±6%)x320 | (1±6%)x80 | 1.0304 | -0.00085 | 1.03125 | 1.5612 | -0.0013 | 1.5625 |
| 6 | (1±6%)x384 | (1±6%)x96 | 1.2355 | -0.002 | 1.2375 | 1.8719 | -0.0031 | 1.875 |
| 7 | (1±6%)x448 | (1±6%)x112 | 1.4448 | 0.00105 | 1.44375 | 2.189 | 0.0015 | 2.1875 |
| 8 | (1±6%)x512 | (1±6%)x128 | 1.6541 | 0.0041 | 1.65 | 2.5061 | 0.0061 | 2.5 |
| 9 | (1±6%)x576 | (1±6%)x144 | 1.8637 | 0.00745 | 1.85625 | 2.8237 | 0.0112 | 2.8125 |
| 10 | (1±6%)x640 | (1±6%)x160 | 2.0732 | 0.0107 | 2.0625 | 3.1411 | 0.0161 | 3.125 |
| 11 | (1±6%)x704 | (1±6%)x176 | 2.2672 | -0.00155 | 2.26875 | 3.435 | -0.0025 | 3.4375 |
| 12 | (1±6%)x768 | (1±6%)x192 | 2.4712 | -0.0038 | 2.475 | 3.7441 | -0.0059 | 3.75 |
| 13 | (1±6%)x832 | (1±6%)x208 | 2.6789 | -0.00235 | 2.68125 | 4.0588 | -0.0037 | 4.0625 |
| 14 | (1±6%)x896 | (1±6%)x224 | 2.8902 | 0.0027 | 2.8875 | 4.3789 | 0.0039 | 4.375 |
| 15 | (1±6%)x960 | (1±6%)x240 | 3.1092 | 0.01545 | 3.09375 | 4.7107 | 0.0232 | 4.6875 |
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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