Quizbank quiz buzzer

Quizbank Buzzer 1

User Manual Author: Midhun P.A

QUIZBANK

BUZZER

September 2013

Design:

Midhun P.A [email protected]

P. Vignesh Swastik Technologies

[email protected]

Client:

Hala P.J The Quizbank, Muscat Codex, Muscat - Oman

mailto:[email protected]


Quizbank Buzzer 2


INDEX

About the system .............................................. 3

Installation ........................................................ 6

Replacing the buzzer alarm ............................. 10

Tests ................................................................ 11

Constraints ...................................................... 13

The system ...................................................... 14

At the shows.. ................................................. 15

Quizbank Buzzer 3


About the system

Control Box:

Fig. 1

Quizbank Buzzer 4


There are two power supply cables for the control box:

1. Input to the transformer, power to drive the

microcontroller.

2. 12V DC input to the relay switch board, power to drive

the LED beacons.

The microcontroller is flashed with a C Program and functions

with 16MHz clock frequency. Multiple switch responses from

teams is received and the fastest response is detected.

12 output ports to the switches are divided into six and are

extended out on either side of the control box with wire

connectors.

12 output ports for Light beacons are also divided into six and are

extended out on either side of the control box connected to the

respective wire connectors.

One connector contains a switch and a light beacon output to one

team.

Fig. 2

Quizbank Buzzer 5


Fig. 3

Inbuilt reset button is provided on the board. It is extended via

the reset output port.

When the system in powered on, it will be in the idle state waiting

for input from the teams via the push switch. Once a Push switch

response is received from a team, the buzzer alarm is switched on

for one second and the Light beacon of the corresponding team

switches on. The Light beacon will be kept on. Only when the

reset switch is pressed, the Light beacon turns off. Then the

system gets back to idle state.

The system caters to any no. of teams. Maximum team count is

12.

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Installation

1. Make sure both the power cords from the control box are not

connected to the mains.

2. Put a 9V battery for the inbuilt buzzer alarm (sticker is provided

in the control box).

3. Connect the push switches and Light beacons to the control

box. Each switches and Light beacons are provided with

connectors.

Fig. 4

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The polarities on the Light beacons are indicated by:

Positive- Red Wire.

Negative- White Wire.

Make sure the polarities match on the control box connectors.

Reversing polarities will damage the Light beacons.

Insert the wires by the following method:

Strip the wire.

Bend the copper edge.

Push the wire to the connector firmly. Tight the screw of the connector.

Make sure to screw on the PVC coating of the wire instead of the copper

leads. And make sure no copper leads are protruding outside the

connectors.

Fig. 5

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NOTE:

The LED Strip can be connected parallel to the Light

beacon wires on the team desk. Make sure the polarities

match.

4. Connect the reset switch to the control box. Refer Fig.5

to securely insert the wires.

5. Connect both the power cords to the mains. The Power

Indicator turns on.

6. The system is ready waiting for input from teams via the

push switches.

7. Once a response is received from a team via the push

switch, the buzzer alarm switches on for one second and

the corresponding Light beacon turn on. This can be

observed by the click sounds from buzzer alarm relay

and corresponding Light beacon relay in the control box.

Fig. 6

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Also, the corresponding Light beacon relay LED

indicator in the control box turns on. The Light beacon

will be in on state.

8. Push the reset switch to turn off the Light beacon. The

system is reset to idle state waiting for another push

switch response from teams.


Quizbank Buzzer V1.0 10

Replacing the buzzer alarm

NOTE: Make sure the drive voltage of new buzzer alarm is 12V. Since the maximum

Voltage the system function is 12V, higher voltages are risky and might damage

the boards.

As per Fig. 7, connect the inputs of the new buzzer alarm to the

input wires. And connect the power supply wires parallel to the

12V power supply in the control box (brown-positive and blue-

negative wires).

If the new buzzer alarm’s drive voltage is less than 12V, replace

the battery and connect it to the existing power supply wires.

Fig. 7



Tests

Test Procedure Observed result Functionality of the microcontroller:

1. Responses of all 12 switch ports.

For the response of each 12 switches, the buzzer alarm turned on for one second and corresponding light relay turned on.

2. Response of reset function.

For the response of each 12 switches, the buzzer alarm turned on for one second and corresponding light relay turned on. When the reset switch was pressed, the light relay turned off.

3. Inbuilt buzzer alarm For the response of each 12 switches, the buzzer alarm turned on for one second and then turned off.

Voltage measured at the connectors.

12 switch ports output: 4.5V(approx.) 12 Light beacon relay output: 12.2V(approx.)

Integration with the purchased Push switches and Light beacons.

The system responded successfully as per the Functionality of the



microcontroller.

Stress test The system was kept on for 4 hours.

The system functioned without any faults. The inputs and output response were proper. Since little amount of heat is produced in the power board and transformer, vent holes were provided on the control box.

Distance test A push switch and a Light beacon were kept at 10meters.

The control box responded to the push switch and the light beacon turned on. The voltages observed were same as in Voltage measured at the connectors.

Rigidity of control box. The circuit boards are screwed onto a wooden board. The wooden board is screwed onto the plastic box.

The control box was transported many times. All the screws remained intact and no components were seen loose.



Constraints

Has two power supply plugs.

Initially there was one power supply to drive the entire

system. But, it didn’t give sufficient amps to drive 12

light beacons.

So, a dedicated 12V adapter is provided to drive the light

beacons. Also, it gives sufficient power to drive the 12V

LED strip.

Heat is produced from the control box

A mini transformer is used to step down 230V from the

mains. And a power driver circuit board to supply power to

the microcontroller. These will produce a good amount of

heat. Vent holes are provided on the control box.

External buzzer alarm should be 12V

The entire system runs on 12V and 5V(microcontroller).

So, providing a higher volt buzzer alarm to the board is

very risky. It is not sure whether the system will be able to

handle. A 9V buzzer alarm is installed in the control box. It

is sufficient in a huge indoor hall. If the buzzer alarm is to

be replaced refer Replacing the buzzer alarm.

There are 4 wires going from the control box to a team’s

desk

The push switch has two wires. The light beacon also has

two wires (+ and -). When the LED strip is provided, it

will



add two more wires. And total will be 6. It is better to connect

the LED strip parallel to the light beacon on the desk.

The system



At the shows...

Updated on 29 Jan 2017

X-Quiz-itz 2013

X-Quiz-itz 2013

Inter School Quiz for grade V, VI, VII & VIII students

hosted by the Muscat Codex on 23rd January 2014 at Indian School Muscat.

Inter School Quiz for grade V, VI, VII & VIII students hosted by the Muscat Codex on 23rd January 2014 at

Indian School Muscat.



India Quiz organized by Muscat Codex on 6th February 2014 at Indian Social Club, Multipurpose Hall at Darsait.

Delicio X-Quiz-itz – Finals 2015

X-Quiz-itz hosted by Muscat Codex

https://www.muscatcodex.com

https://www.facebook.com/muscatcodex/

[email protected]

https://www.muscatcodex.com/

https://www.facebook.com/muscatcodex/


Quizbank quiz buzzer

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