ESSENTIAL INFORMATION
BUILD INSTRUCTIONS
CHECKING YOUR PCB & FAULT-FINDING
MECHANICAL DETAILS
HOW THE KIT WORKS
WHAT CAN YOU PROTECT WITH THIS
ALARM KIT
Version 2.0
Alarm Essentials
www.kitronik.co.uk/2101
Build Instructions
Before you start, take a look at the Printed Circuit Board (PCB). The components go in the side with the writing on
and the solder goes on the side with the tracks and silver pads.
1
PLACE RESISTORS
Start with the seven resistors:
The text on the PCB shows where R1, R2 etc go.
Ensure that you put the resistors in the right place.
PCB Ref
R1, R3 & R5
R2
R7
R4 & R6
Value
10KΩ
220KΩ
330Ω
1.2MΩ
Colour Bands
Brown, black, orange
Red, red, yellow
Orange, orange, brown
Brown, red, green
2
SOLDER THE CERAMIC CAPACITORS
Solder the four ceramic capacitors into C1, C3, C4 and C6. They can go in either position as they
are all the same.
SOLDER THE ELECTROLYTIC CAPACITORS
3
Solder the two electrolytic capacitors into C2 and C5. They can go in either position but it is
important that the ‘–’on the capacitor lines up with the ‘----’ markings on the PCB.
SOLDER THE IC HOLDER
4
Solder the Integrated Circuit (IC) holder into U1. When putting this into the board, be sure to get
it the right way around. The notch on the IC holder should line up with the notch on the lines
marked on the PCB.
5
SOLDER THE LED
Solder the Light Emitting Diode (LED) into LED1. The alarm won’t work if it doesn’t go in the right
way around. If you look carefully one side of the LED has a flat edge, which must line up with the
flat edge on the lines on the PCB.
6
SOLDER THE BUZZER
The buzzer should be soldered into the ‘buzzer’ terminal. The red wire must go to the ‘+’ terminal
and the black wire must go to the ‘–’ terminal.
Alarm Essentials
www.kitronik.co.uk/2101
FIT THE BATTERY CONNECTOR
7
The battery connector should be soldered into the ‘Power’ terminal. The red wire must go to the
‘+’ terminal and the black wire must go to the ‘–’ terminal.
SOLDER THE ARM / DISARM SWITCH
8
Cut and strip two short lengths of wire. Solder these to an edge and the centre terminal on the
same row of pins on the switch. The terminals that should be used are shown in black on the
drawing, below. Now solder the other end of the wires to the PCB where it is marked ‘armed’. It
does not matter which way around the two wires go.
9
SOLDER DETECTION SWITCH
Look carefully at the sensor switch and you will see that it is marked COM (common), NO
(normally open) and NC (normally closed). Cut and strip two short lengths of wire. Solder these to
the COM and the NO terminals on the switch and solder the other end of the wire to the PCB
connection marked Q1 (sensor).
PLACE THE IC INTO HOLDER
10
The IC can be put into the holder ensuring the notch on the chip lines up with the notch on the holder.
Alarm Essentials
www.kitronik.co.uk/2101
Checking Your Alarm PCB
Check the following before you insert the batteries:
Check the bottom of the board to ensure that:
All holes (except the 4 large 3mm holes) are filled with the lead of a component.
All these leads are soldered.
Pins next to each other are not soldered together.
Check the top of the board to ensure that:
The notch on the IC and the IC holder are in the same orientation as the markings on the Printed Circuit
Board.
All the resistors are in the right place.
The red / black wires on both the power connector and buzzer are the right way around.
The LED is in the right way around.
Both of the electrolytic capacitors have the ‘----’ marking on the PCB lined up with the ‘-’ on the capacitor.
Testing the PCB
When the batteries are connected, either or both the disarm LED / the alarm sounder may start.
To stop this, put the alarm into the disarmed state (push the slide switch so that it is at the end where the
wires are connected).
Now move the arm switch into the arm state (slide the switch the other way).
Close the door switch; the LED should remain off.
Open the switch and the LED should light, indicating that the alarm should be disarmed.
After around 20 – 25 seconds the alarm should sound.
If your circuit does not function as described, use the fault finding flow chart to resolve the issue.
Using the Alarm
To arm / disarm the system use the arm switch.
When exiting the alarmed area, move the arm switch to the arm position.
Close the door behind you.
Upon entering the alarmed area you have 20 –25 seconds in which to disarm the alarm.
The LED will light to indicate that the alarm needs to be disarmed.
Disarm it by moving the arm switch into the disarm position.
Should the alarm not be disarmed in the given time, the buzzer will sound (this will continue for 2 minutes or
until the alarm is disarmed).
Alarm Essentials
www.kitronik.co.uk/2101
Fault Finding
Start
With the alarm system in the armed
state and the door sensor open.
Power the board up
Fault finding flow chart
page 1
Does the
LED go on or
the buzzer
sound?
Yes
No
Close & open the door
sensor
Yes
Does the
LED go on or
the buzzer
sound?
No
Wait for the LED to go out
Then disarm the system
•
•
Has the
LED gone off
and the buzzer
stopped?
No
Yes
•
•
•
•
Check
The batteries are good and in the right
way around
The power clip is in the right place and
connected the right way around and
soldered
For a short on the arm switch
For a dry joint on R5 or R6
U1 pin 5 for dry joints
U1 pins 4 / 10 for a short
Go to page 2
Both the LED and
buzzer stay on
What is
left on?
The buzzer
stays on
Check
For a dry joint on the arm switch and that
the correct terminals have been used on the
switch
The LED
stays on
•
•
•
•
Check
R2 for a dry joint
U1 for a short between pins 6 & 7
U1 pin 2 for a dry joint
C4 for a short
Check
• U1 pin 7 for a dry joint
• U1 short between pin 8 & 9
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