PRT-12080 Datasheet PRT-12080 | P4-P6

Attaching the tact switches

Depending on how the board is to be mounted, different headers can be

soldered to the board.

If the overall depth of the assembly is a concern, you can use a right angle

header on the same side of the board as the tact switches.

Right angle header on top of board

If clearance past the edge of the board is a concern, you can use a straight

header soldered to the side opposite the switches.

Straight header on back of board

And of course, you could always solder wires directly to the board in place

of the header.

Connecting The VKey To An Arduino

Basic hookup to an Arduino

It takes three wires to connect the VKey to an Arduino.

(VKey → Arduino)

•V+ → 5V

• Vout → A1 (or any other analog pin)

• GND → GND

Arduino Library

Page 4 of 8

To make interfacing the VKey as simple as possible, we’ve written an

Arduino library and example sketch. If you need a refresher on how to

install an Arduino library, please see our library tutorial.

The VKey library provides an object that interfaces with a VKey keypad. In

a typical application, this class is instantiated as a global object before the

setup() function. In the VKey object declaration, you need to select the

appropriate analog input pin, and set the power indication to the proper

voltage, either

THREE (actually shorthand for the more common 3.3V) or

FIVE .

It is possible to attach several VKeys, each on it’s own analog input pin, by

declaring multiple VKey objects to watch the corresponding analog pin

numbers.

The VKey status is queried using the function

bool CheckKeys(eKeynum & k);

The function will always return an indication of the current button in

reference parameter k, or

NONE in the case that no buttons are pressed.

The function also returns a boolean indication of whether the key has

changed since the last time it was queried – a form of edge detection. Many

applications will only care about handling the key number when it updates,

and don’t need to process the input when it is unchanging.

The next page will show us a quick sample sketch that uses the VKey

library.

Example Code

Once you have installed the library, open the Arduino IDE, and paste the

following into the sketch:

Page 5 of 8

/*************************************************************

*****************

VKey_demo_main.ino

VKeyVoltageKeypaddecodingdemo

ByByronJacquot@@SparkFunElectronics

February4,2014

https://github.com/sparkfun/VKey_Voltage_Keypad

ThisdemonstratesinterfacingtheSparkFunVKeyvoltagekeypa

dusing

theVKeyArduinolibrary.

TheVKeyhasanarrayof12pushbuttons,eachproducingauni

queanalog

voltagewhenpushed.Amicro

controllercanreadthevoltag

e,anddetermine

whichkeyhasbeenpressed.TheVKeylibrarykeepstrackof

theanalogpin

connection,keystatus,andvoltagecalibrationdetails.

TheVKeywasconnectedtotheArduinoasfollows:

VKeyGND>ArduinoGND

VKeyVout>Arduinoanalogin

putA1

VKeyV+>ArduinoVCC

Tousethelibrary,instantiateaVKeyobjectandperiodicall

ycheckforinput

usingthecheckKeys()function.

Resources:

noadditionallibraryrequirements

Developmentenvironmentspecifics:

DevelopedonArduinoIDE1.0.5

Testedona5VRedboardand3.3VProMini

Thiscodeisbeerware;ifyouseeme(oranyotherSpark

Fune

mployee)atthe

local,andyou'vefoundourcodehelpful,pleasebuyusarou

nd!

Distributedasis;nowarrantyisgiven.

**************************************************************

****************/

#include<VKey.h>

//GlobaldeclarationoftheVKeyclass

//Initializedwithanalogpinnumberandsupplyvoltage

VKeykeypad(A1,VKey::FIVE);

void

setup()

{

//Initializeserialportfortextoutput

Serial.begin(9600);

Serial.println("WelcometoVKeyexample");

//NoVKeyspecificinitializationrequired.

}

void loop()

{

VKey::eKeynumk;//Variabletoreceivethekeyindication

Page 6 of 8

P1-P3 P4-P6 P7-P8

PRT-12080

Mfr. #:

Buy PRT-12080

Manufacturer:

SparkFun

Description:

Daughter Cards & OEM Boards Vkey Voltage Keypad Voltage Keypad

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New from this manufacturer.

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