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Timed Night Light Project Kit

3.75
Exclusive to Kitronik
Teaching Notes
Key Stage 3/4
The Colour Changing LED on this kit turns on when it goes dark and stays on for up to 30 minutes.

Out of stock. Orders can be placed and will be despatched once in stock.

Code1+ 5+ 50+
2139£3.75
(£4.50 incl VAT)
£2.95
(£3.54 incl VAT)
£2.65
(£3.18 incl VAT)
OR

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 on board 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:

Dimensions:

  • PCB Length: 53mm.
  • PCB Width: 41mm.

Requires:

Resources:

This kit is supplied in a grip seal bag.

Free samples:

Teachers can order a sample of this kit (one per school) here. 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 kit is designed and manufactured in the UK by Kitronik.


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Questions:

Posted by ian higgins, Wednesday, 18 January 2017 on product Timed Night Light Project Kit
  • 0
    vote
    A:

    Hi Ian, If you wanted to swap the colour changing LED for a standard LED you could choose from the majority of the LED’s that we stock, what you would need to do is put a resistor in series with the Led to prevent it from being damaged as a colour changing LED doesn’t require a resistor. If you find an LED you won’t you can then use the following page to work out what resistor is needed, https://www.kitronik.co.uk/blog/led-resistor-value-calculator

    Posted by Michael Lockhart on Wednesday, 18 January 2017
Posted by Thomas Tickell, Monday, 21 November 2016 on product Timed Night Light Project Kit
  • 0
    vote
    A:

    Hi Thomas, The board can handle an output of 200mA due to one of the components, generally LED’s draw around 20mA, as such you wouldn’t be able to exceed the maximum current limit of 200mA. Colour changing LED’s like the one used in the kit vary on how much current they draw depending on the colour they are producing and could peak at around 50mA.  If you are using different LED’s to the one that is supplied in the kit you will need to work out what resistor values are needed for each coloured LED. 

    Posted by Michael Lockhart on Monday, 21 November 2016
Posted by Thomas Tickell, Monday, 21 November 2016 on product Timed Night Light Project Kit
  • 0
    vote
    A:

    Hi Thomas, the PCB has the following dimensions Length: 53mm, Width: 41mm.

    Posted by Michael Lockhart on Monday, 21 November 2016
Posted by craig gwilliam, Wednesday, 6 January 2016 on product Timed Night Light Project Kit
  • 0
    vote
    A:

    This kit should be fine to power 3 LEDs, however please beware in mind that if you want to use a standard LED then you would need to ensure a resistor is used to protect the LED and stop it burning out. This is due to the circuit puts the full voltage of 3xAA batteries across the LED which can be up to 4.8V

    Posted by Michael Lockhart on Wednesday, 6 January 2016
Posted by jim dinne, Wednesday, 17 December 2014 on product Timed Night Light Project Kit
  • 0
    vote
    A:

    Hi, we do try to space the pads to make it easy for people to solder so we will look into those ones for you. We have a lot of stock of the current PCBs though so any changes would be a while away.

    Posted by Aaron Sturman on Wednesday, 17 December 2014
Posted by Temidayo Ismail-Sobogun, Friday, 31 October 2014 on product Timed Night Light Project Kit
  • 0
    vote
    A: You would add the switch at the point where the power connects to the circuit board. So you would connect the positive (red cable) to the switch, then from the switch connect it to the circuit board. As for adding a second LED this would be done by taking a wire from the positive legs of the two LED's and connecting them to the circuit board, do the same for the negative legs, ensuring you connect the LED's the correct way round on the circuit board.
    Posted by Aaron Sturman on Friday, 31 October 2014
Posted by Ian, Wednesday, 30 April 2014 on product Timed Night Light Project Kit
  • 0
    vote
    A: Hi, The circuit puts the full voltage of 3xAA batteries across the LED which can be up to 4.8V. If you wanted to use a standard LED you would need a resistor in to limit the current. You could try a blue or white superbright LED with a 3.1V forward voltage without a resistor, it might burn out quite quickly though.
    Posted by Aaron Sturman on Wednesday, 30 April 2014
Posted by James Cook, Wednesday, 10 April 2013 on product Timed Night Light Project Kit
  • 0
    vote
    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 https://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!
    Posted by Aaron Sturman on Wednesday, 10 April 2013
Posted by Gerry Cochrane, Monday, 30 January 2012 on product Timed Night Light Project Kit
  • 0
    vote
    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.
    Posted by Kevin Spurr on Monday, 2 December -1

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Physical characteristics:

  • PCB Length: 53mm.
  • PCB Width: 41mm.
  • PCB Component Count: 15.

Electrical characteristics:

  • Voltage Nominal: 4.5V.
  • Voltage Range: 2.7V - 5V.
  • Standby Current: 0.3mA.
  • Current Max at Nominal Voltage: 49mA.
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