Asked by: john simmonds
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Kitronik Alarm Project Kit plus batteries
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Description
This kit can be used to make a shed or room alarm when mounted on the top of a door, drawers or any other object with a moveable opening. It can also be used by replacing the micro switch with a magnetic door contact.
A micro switch acts as a trigger mechanism and is armed / disarmed by a seperate sliding switch. The door's movement is detected by a micro switch mounted onto a door or object with a lid. A timer provides an entry delay during which the system can be disarmed by the slide switch, whilst a separate timer silences the alarm after two minutes. Both of these timers are implemented via a 556 dual timer IC.
The alarm can be further enhanced by using a simple key switch for arming / disarming or by replacing the micro switch with a magnetic door contact switch to activate it. The board, battery pack & buzzer can be placed into a box designed by the student.
Features:
- Can be enhanced with a key switch to arm/disarm.
- Can be enhanced by replacing the micro switch with a magnetic door contact switch.
- Entry delay for disarming.
Contents:
- 1 x PP3 Battery Clip Lead (Heavy Duty).
- 1 x 4xAA Battery Cage with Clip.
- 1 x Miniature DPDT Slide Switch.
- 1 x NE556 Dual Timer IC.
- 1 x IC Socket 14 Pin.
- 1 x Piezo Buzzer (with Drive).
- 4 x Capacitor, Ceramic, 50V, 10nF.
- 2 x 100uF Cap Low Leakage.
- 3 x 10KΩ Resistor.
- 1 x 220KΩ Resistor.
- 2 x 1.2MΩ Resistor.
- 1 x Micro Switch with Medium Lever.
- 1 x Red 5mm Diffused LED - 275mCd.
- 1 x 330Ω Resistor.
- 1 x Alarm Project Kit PCB.
Possible applications include:
- Adding an alarm to a cookie/biscuit tin.
- Adding an entry alarm to a door.
Dimensions:
- PCB Length: 51mm.
- PCB Width: 41.5mm.
Requires:
- 4 x AA Batteries.
This kit is supplied in a simple grip seal bag.
Note:
This is an educational kit and should not be used to secure anything of value.Free samples:
Teachers can order a sample of this kit (one per school) request a sample kit.
You will need to select the kit from a list of all the sample kits; the stock code for this kit is 2101.
Note: this service is only offered to schools for evaluation purposes only.
Buy British:
This product is designed and manufactured in the UK by Kitronik.
Same Day Dispatch
- Orders placed online before 3:00pm Monday - Friday (excluding public holidays and our Christmas shutdown period) are always dispatched the same day provided the goods are in stock. If the goods are not in stock we will endeavour to contact you as soon as possible to discuss a dispatch date.
UK Deliveries
- If you live on the UK mainland and don't have any large materials or lithium batteries in your order it will cost £3.95 (£4.74 including VAT) if you spend less than £40 (£48 including VAT).
- If you spend between £40 and £200 (£48 - £240.00 including VAT, excluding large materials or lithium batteries) delivery is free to most locations, £12 (£14.40 including VAT, excluding large materials or lithium batteries) to Northern Ireland and £15 (£18.00 including VAT, excluding large materials or lithium batteries) to UK remote locations. For a list of postcodes that will be charged the remote location rate: remote area list.
- If you spend over £200 (£240.00 including VAT, excluding large materials or lithium batteries) delivery is free within the UK.
Rest of the world
- These orders are sent via UPS, and the cost is dependant on the service you choose at checkout. Alternatively you can choose the free collection option and have your own courier collect it from us. International orders can only be shipped to the registered card address. Please note: International orders may be charged import duty dependant on local import laws and duty rates. These charges are usually billed to you directly from UPS.
- Delivery times vary for international orders depending on the service selected and the destination. You can see the delivery time and cost at the shipping stage, or by using the shipping estimator from within the shipping basket.
Collection
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Further Information
- For information about all of the delivery options we offer see full delivery details.
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Q:
Hi
I notice that the batteries don't last very long for this alarm.
Will it run on only 5 V.
I ask because if it would I could run it off my Raspberry PI continuously rather than keep having to buy new Batteries ( which isn't very green )
Thanks
A:
Hi John,
Thank you for your question, it would need to be 5V or a power source close in value to that I am afraid.
Best Regards
Cullen
Answered by: Cullen Lewis
30-Mar-20
Q:
Note that in "How the Circuit Works" in the instruction booklet the 2.2K ohm resistor is actually the 220K ohm one provided in the kit.
It looks like the circuit functions as a 1-shot, so that to re-enable it I need to cycle the power. Is that correct? If so, I will add a Normally Open switch on the power line as a Reset.
Asked by: Diane Brancazio
A:
Hi Diane,
Thank you for your question, you should not need to power cycle the kit to re-enable it from what I have tried.
Could you point me to the particular point with the note about the 2.2K resistor. I have had a look over the instructions today and could not find a mention of a 2.2K resistor but could easily have missed it!
Best Regards
Cullen
Answered by: Cullen Lewis
11-Mar-19
Q:
Please could you explain how to connect the Magnetic Door Contact Switch to the circuit? Thank you.
Asked by: Kirsty
A:
Hi Kirsty,
Thank you for your question, so the magnetic switch comes with two parts a switch and a magnet, both in a white plastic casing. The switch is triggered on and off by the magnet being moved away from the switch.
In the alarm circuit you would solder the switch into where the micro lever switch normally sits. The switch is the part with the metal contacts on the bottom.
If you were going to trigger the alarm when the door opened then you would affix the magnet to the back of the door and the alarm so that the switch is nearly touching the magnet. When the door is opened the magnet would be moved away thus triggering the alarm circuit.
I hope this makes sense it should be an easy change over but any other questions let me know.
Best Regards
Cullen
Answered by: Cullen Lewis
26-Feb-19
Q:
Can I change the output to LED without a problem?
Asked by: rico
A:
HI Rico,
Thank you for your question, you should be able to change that over relatively easily though depending on the LED you may need to add a resistor in.
Best Regards
Cullen
Answered by: Cullen Lewis
07-Dec-18
Q:
Is there any way that we can request a CD Rom with extra teaching notes? I'm no school.
Asked by: Matthew Drinkall
A:
Hi Matthew, I emailed you the pdf of the notes for this project kit. Let me know if you want any of the others.
Answered by: Aaron Sturman
08-Aug-13
Q:
How long would this kit take to assemble?
Asked by: Meerav Shah
A:
It would take roughly between 10 and 20 minutes depending on how good you are at soldering. Maybe a bit longer if you have not soldered before.
Answered by: Aaron Sturman
07-May-13
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