Altronics K 9650 Snelstarthandleiding

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Arduino-Compatible 12-Button Wallplate

I/O Interfacing is one of those things that almost every

project needs. The K9650 provides some of the basics,

integrating a 4x3 keypad, 2 relays and a piezo transduc-

er into an Australian standard wall plate. It also includes

an Arduino compatible ATmega328P and Arduino shield

headers for added flexibility.

The main feature of the K9650 is the wall-

plate sized membrane keypad. Electrically,

the keypad is an array of 12 switches ar-

ranged into a 3-column, 4-row grid. Read-

ing keypads like this requires multiplexing

to individually read all switches along a sin-

gle line at once, else a single switch could

be read as multiple switches. To handle this

multiplexing in software, the Arduino "Key-

pad" library (Search "Keypad "from the Ar-

duino IDE's Library Manager) can be used.

Solder jumpers are included (NO type) to

reduce the number of wires needed to at-

tach the keypad, while the breakout header

can be used to remedy pin-conflicts with

any shield used. C1-3 indicates the column

connected, R1-4 indicates row and D3-9 in-

dicates the digital pin the jumper connects

to. '1' on the keypad is on the R1-C1 po-

sition.

Feedback options include 2 1A relays, driv-

en via BC547 transistors, 2 high brightness

LEDs fitted so they shine through the mem-

brane keypad and a piezo transducer. The

Arduino standard D13 LED has also been

included as a diagnostic tool (LED3). Driv-

ing the LEDs and relays can be managed via

the standard digitalWrite command thanks

to the transistors buffering the relays. How-

ever, being a transducer the piezo requires

an oscillating waveform. Arduino's built

in "Tone" library can be used to gener-

ate square waves at a specified frequency,

while more advanced DDS code examples

exist, which can generate higher precision

sine waves (an external RC filter would like-

ly be needed to smooth out the switching

waveform).

Constructions

To begin construction, close the required

solder jumpers for the membrane keypad,

then fit the resistors and diodes: R1;1MΩ,

Important Note:

Please note that we can offer a warranty only on the components supplied

with this kit. Because we are unable to guarantee your labour, there is no

warranty on either partially or fully built kits. We are able to offer a repair

service, but once construction has

commenced, this service is chargeable.

174 Roe Street, PERTH.

Western Australia. 6000

Phone: (08) 9428 2188

Fax:

E-mail: [email protected]

Dealers Throughout Australia

R2-4;200Ω, R5,6,9;1kΩ, R7,8;10kΩ. Note

than R2,3,7&9 are fitted vertically, and

bent over (Up for R2,3, down for R7, R9 is

not bend, but should be fitted to minimise

height) as they stand too tall when a wall

box is fitted. D1-3 are all fitted vertically,

with the cathode stripe matching the silk-

screen fill on the board.

Fit the capacitors next, making sure to

pay attention to the polarity and mount-

ing position of C5; The stripe indicating the

negative lead should point into the cen-

tre of the board. Leave enough height to

bend C5 down against the board to avoid

height problems when a shield is fitted.

The remaining capacitors are ceramic types,

and are not polarity sensitive: C1,2;22pF,

C3,4,10;100nF, C5;10μF/50V, C6,7;2.2μF.

The crystal (X1) and reset button (S1) can

also be fitted now. They are not polarity

sensitive.

Next, fit the transistors and voltage regu-

lators, ensure that they aren't mixed. They

should be fitted as close to the board as

possible to ensure there aren't any clear-

ance problem to a fitted shield. Q1-3 are

BC547, fitted with the flat marking side

matching the flat on the silkscreen. REG1

is the 5V regulator and is indicated by the

"KY5050" marking on the package. Reg2

is the 3.3V regulator and similarly is marked

"KY5033". They are both fitted with the

flat side pointing out from the board. LED3

can also be fitted now (Red, not the water-

clear LEDs), making sure the flat on the LED

matches the flat on the silkscreen.

At this point, the only remaining top-side

components should be the relays, headers,

IC socket, and screw terminals. Fit the screw

terminals, IC socket (notch to bottom of

board) and headers now. The screw termi-

nals are best fitted with the cable entry to

the bottom of the board. The 6, 8 (x2) and

Dear Kit Constructor,

At Altronics we take great pride in the quality and presentation of our

kits. If you find any deficiency in this kit or have any constructive com-

ments whatsoever, please write to us:

[email protected]

(08) 9428 2187

K 9650