Asked by: Paul
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Kitronik Timed Night Light Project Kit plus batteries
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Kitronik Timed Night Light Project Kit plus batteries and soldering srter kit
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Description
The colour-changing LED on this kit turns on when it goes dark and stays on for a period of time.
This makes a good night light and because the LED is only on for a small amount of time the batteries last much longer than a light that is on all night.
There is an onboard trimmer to set the light level at which the LED turns on and another trimmer to set how long the LED stays on for. The maximum duration is about 30 minutes.
When set to 15 minutes and activated once a night the batteries will last two months.
Features:
- Adjustable light level sensor.
- Adjustable length of light time.
Contents:
- 2 x 10K Resistor.
- 2 x 1M Resistor.
- 1 x PCB trimmer 220K POT.
- 1 x PCB trimmer 10M POT.
- 1 x 47R Resistor.
- 1 x Miniature LDR.
- 1 x Capacitor, Electrolytic, 16V, 470uF.
- 4 x 2N7000 N Chanel FET.
- 1 x Colour Changing 5mm Diffused LED - 750mCd.
- 1 x PP3 Battery Clip Lead (Heavy Duty).
- 1 x 3xAA Battery Cage with Clip.
- 1 x Timed Night Light Kit PCB.
Dimensions:
- PCB Length: 53mm.
- PCB Width: 41mm.
Video:
Requires:
- 3 x AA Batteries.
- Soldering Iron.
- Solder.
- Wire Cutters.
This kit is supplied in a grip seal bag.
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 2139.
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
- If you would like to collect your order, or use your own courier then there is an option you can select during checkout. We do not charge a packaging or handling fee for this service, and you will receive an email when your order has been processed, you can collect half an hour after receipt of this email.
Further Information
- For information about all of the delivery options we offer see full delivery details.
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Q:
I ordered 20 class sets of these for my school, but the miniature LDR is not there - instead it is a different component that looks like a small LED. I understand though the LDR is discontinued - What is this replacement product, and will this work the exact same way?
A:
Hi Paul,
Thank you for your question, the replacement part is called a phototransistor. It works in a similar but subtly different way in this circuit. The old LDR would alter it's resistance based on the light level reaching it. This increased flow of power would then trigger the transistors to switch on the LED.
The new phototransistor is a transistor that is triggered by light instead of electrical current and then switches the other transistors in the circuit to turn on the LED.
Best Regards
Cullen
Answered by: Cullen Lewis
15-Nov-19
Q:
Can you tell me how I would build this kit exactly the same, however instead of using an LDR I would like a simple push button switch. Thank you
Asked by: James Cook
A:
If I understand correctly you are looking for a circuit where you press a button and an LED turns on for an adjustable length of time. If that is what you are looking for you could use http://www.kitronik.co.uk/products/project-kits/easy-build-kits/led-picture-frame-kit/ . This would power up to 10 high brightness LEDs and you can set the time the lights will be on up to around 30 minutes. Alternatively, if you really want to use the timed night light kit you could replace the LDR with a latching switch and put a 5k resistor in series with the switch. I would recommend the first option though, as it would be more straight forward and less expensive!
Answered by: Aaron Sturman
10-Apr-13
Q:
Hi. Can I power the unit with a PP3 battery (9V) and will this extend the time it would last?
Asked by: Gerry Cochrane
A:
I am afraid you cannot run this from a 9V PP3 battery. This voltage would be too high for the colour changing LED which needs a supply of between 2.7Vand 5V. Also the PP3 battery would last for a much shorter time, as the capacity of a PP3 battery is typically less than that of an AA battery.
Answered by: Kevin Spurr
30-Jan-12
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