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Dark Activated Colour Changing Night Light Kit

Product Code: 2120
Easy Build
Exclusive to Kitronik
Teaching Notes
Key Stage 3

Quick Overview

When in darkness, this Easy Build Kit generates an array of different coloured illuminations using a Colour Changing LED.

Availability: In Stock.

Excl. VAT: $4.120 Incl. VAT: $4.944
  • Buy 10 for $3.302 ($3.963 incl. VAT) each and save 20%
  • Buy 100 for $2.681 ($3.217 incl. VAT) each and save 35%
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The colour changing LED in this kit is automatically illuminated and starts to cycle through various patterns when the light sensor has detected that is dark. The kit uses the light activated board with a colour changing LED. Ordering is now easier - order part code 2120 and you will get the light activated switch project kit (part 2112) accompanied with a battery clip, battery cage and rainbow LED. All individually bagged and ready for your students to build.

This kit contains:

  • 1 x 100Kohm potentiometer
  • 2 x BC337 NPN transistor
  • 1 x 220ohm resistor
  • 1 x LDR (light dependent resistor)
  • 1 x colour changing (rainbow) LED
  • 1 x PP3 clip leads
  • 1 x 4AA battery holder
  • 1 x night light PCB

PCB dimensions: 53mm x 25.5mm.

Requires x4 AA batteries, available separately.

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case 1 lit
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Night Light designs by students at Plymstock School.
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An example of a Colourful Mood Light.
Colour Changing LED demo and explanation
Video Colour Changing LED Demo & Explanation
Colour Changing LED demo and explanation video.
Dark Activated Night Light
Video Dark Activated Colour Changing Night Light Demo
Dark Activated Colour Changing Night Light demo video.
Ask Kitronik Night Lights
Video Night Lights
A video about our Night Light Kits taken from our Ask Kitronik Live event 2012.
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Colour Changing Night Light – How It Works
Learn how to introduce Colour Changing LEDs to mood light projects.

Questions:

Posted by Clive, Sunday, 27 April 2014 on product Dark Activated Colour Changing Night Light Kit

Question:

Is their a simple way to convert this circuit to run from a USB cable as per the standard colour light changing circuit?

Answers:

  • Posted by Aaron Sturman on Sunday, 27 April 2014
    Sorry for the delay I wanted to test it for myself! Yes it works fine from USB. It normally runs from 6V but I tested it down to 4V and it worked fine. A USB lead supplies 5V so that?s ok. We sell a cable that goes into a USB port and the other end has two wires, positive and negative. You just solder these into the PCB where you would normally put the batteries. The product code for the cable is 4101 and the product page is here http://www.kitronik.co.uk/products/batteries-holders-chargers-usb-power/power-supplies-and-usb-power/usb-power-lead/
Posted by Corinne Tye, Friday, 11 April 2014 on product Dark Activated Colour Changing Night Light Kit

Question:

Hi Is it possible to connect more than one led in this circuit?

Answers:

  • Posted by Matt Macleod on Friday, 11 April 2014
    Yes you can connect more than one LED, though the LEDs won't say in sync with each other. The number of LEDs that you can connect will be determined by the gain of the transistor I suspect that you should be able to connect 3 or 4 LEDs. If you connect more than the gain allows for you won't damage anything, it will just be a case of the LEDs not being as bright and possibly having the colour sequence restarting from the beginning.
Posted by jonmartlew, Friday, 11 April 2014 on product Dark Activated Colour Changing Night Light Kit

Question:

How much would you charge for around 300 circuits?

Answers:

  • Posted by Matt Macleod on Friday, 11 April 2014
    There's a page here that explains bulk discounts, http://www.kitronik.co.uk/ordering/bulk-buy-discount-for-kits/ if you put the number you want into the product page and click add to cart the cart will show the discount you would receive.
Posted by Michelle Westwood, Friday, 11 April 2014 on product Dark Activated Colour Changing Night Light Kit

Question:

Hi We are having a problem with a number of our kits/ circuits not working.Some one at school has mentioned that we may have the wrong voltage soldering iron. Is there a minium / maxium voltage soldering iron that we should be using? Thanks

Answers:

  • Posted by Matt Macleod on Friday, 11 April 2014
    Hi Michelle, they probably were talking about the power rating of the soldering iron. For our kits we would advise something around 18-22W, more powerful soldering irons are available but they heat things up much more quickly which can mean students sometimes burn the board or components and damage the tracks. That said, the rating of the iron itself can't stop the kits from working. I'd recommend you send some photos of the kits that aren't working to support@kitronik.co.uk so I can take a look at them.
Posted by Terry, Monday, 10 June 2013 on product Dark Activated Colour Changing Night Light Kit

Question:

How long would 4 x Duracell or equivalent batteries last?

Answers:

  • Posted by Aaron Sturman on Monday, 10 June 2013
    Roughly 80-90 hours of the LED being on, but that?s a very rough theoretical answer. Your mileage may vary as batteries vary a lot but when its on it will draw about 25mA and an AA battery holds approx 2000mAh.

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