Kitronik Timed Night Light Project Kit

Stock code: 2139

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1+	£4.30 (excl. VAT)	£5.16 (excl. VAT)
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SKU: 2139 Categories: Intermediate Kits, Lighting Kits & Modules, Electronic Project Kits Tags: blog:kitronik-timed-night-light-kit-stacked-triangles-custom-enclosure, Intermediate Kits, Key stage_KS3 / 4, Kit manufacturer_Kitronik, Kit module_Self assembly kit, Kit packaging_Grip seal bag, Kit resources_Detailed notes, Kit type_Electronic, Lighting Kits & Modules, Programmable kit_No Brand: Kitronik Ltd

Kitronik Timed Night Light Project Kit plus batteries

£5.50

ex VAT

Pro-Elec Alkaline AA Battery - Pack of 4

Add both to Cart

Kitronik Timed Night Light Project Kit plus batteries and soldering srter kit

£17.75

ex VAT

Add all to Cart

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.

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:

Resources:

This kit is supplied in a grip seal bag.

Documents & downloads

This kit is supplied in a grip seal bag.

Technical Information

Attribute	Value
PCB Length	53mm.
PCB Width	41mm.
PCB Component Count	15.
Voltage Nominal	4.5V.
Voltage Range	2.7V - 5V.
Standby Current	0.3mA.
Current Max at Nominal Voltage	49mA.

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Questions and answers

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?

0 votes

Q I ordered 20 class sets of these for my school, but the miniature LDR is not there - instead it i...... Read more
Asked by Paul on November 15, 2019 12:00 am

Answered by the admin 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

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

0 votes

Q Can you tell me how I would build this kit exactly the same, however instead of using an LDR I wo...... Read more
Asked by James Cook on April 10, 2013 12:00 am

Answered by the admin 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!

Hi. Can I power the unit with a PP3 battery (9V) and will this extend the time it would last?

0 votes

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 on January 30, 2012 12:00 am

Answered by the admin 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.

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