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Keyboard - matrix 4x4 tact switch - analog output - Waveshare 4431

Index: WSR-04468 EAN: 5904422371425

The matrix consists of 16 buttons, type tact switch, distributed in four rows and four columns. The system communicates via an analog signal using only one analog input of the microcontroller.

Keyboard - matrix 4x4 tact switch - analog output - Waveshare 4431
€3.90
€3.17 tax excl.
Unavailable
Discontinued product
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Manufacturer: OEM
Compatibility: Arduino

Attention!

The product has been discontinued. Check other products in category.

Description

The matrix consists of 16 buttons, type tact switch, distributed in four rows and four columns. The system communicates via an analog signal using only one analog input of the microcontroller. Pins are the popular goldpin connectors - pitch of 2.54 mm.

 

Connection

The system has three pins: VCC - supply voltage, GND ground and AD, that is, the analog output signal. For information, which button is on, in addition to power supply, AD output should be connected to the input of converter A/C, for example, a pin marked by the letter A inArduino.

 

The formula to calculate the button number from the value of the read voltage, is as follows:

Viv = (button number / 16) x Vref

where:

Viv- read voltage

Vref- voltage reference (in this case, it is the supply voltage)

 

The value of the measurement error can be calculated from the formula:

Vrv = (1 +/-6%)* Viv

 

For example, if you press 8 button, the supply voltage is 5 V, then the read voltage value is 2.5 V with a tolerance of 0.15 V. So the value in the range from 2.35 V to 2.65 V should be accepted.

 

Table of sample values for each button

 

  ADC

Vref=3.3 V

Vref = 5V

No.

10-bit

ADC

8-bit

ADC

The measured value

(V)

Error

(V)

The perfect

value

(V)

The measured value

(V)

Error

(V)

The perfect 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%)x

448

(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%)

x 768

(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

 

 

Switch - type2 monostable
Switch - type keyboard
Switch - shape rectangular
Switch - backlight no
Colour blue
Length 4 mm
Width 4 mm
Raster 2.54 mm
Test 4
Package width 6 cm
Package height 9 cm
Package depth 1 cm
Package weight 0.017 kg

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