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.
- 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.
- PCB Length: 53mm.
- PCB Width: 41mm.
This kit is supplied in a grip seal bag.
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.
This kit is designed and manufactured in the UK by Kitronik.
- 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.
Mood Lights designed by students at Hardenhuish School.
Timed Night Light Project Kit demo video.
A video about our Night Light Kits taken from our Ask Kitronik Live event 2012.
A guide to understanding how a Potential Divider / Voltage Divider works. What is a Potential Divider / Voltage Divider? This is a simple circuit which takes advantage of the way voltages drop across resistors in series.
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-calculatorPosted byon Wednesday, 18 January 2017
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 byon Monday, 21 November 2016
Hi Thomas, the PCB has the following dimensions Length: 53mm, Width: 41mm.Posted byon Monday, 21 November 2016
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 4.8VPosted byon Wednesday, 6 January 2016
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 byon Wednesday, 17 December 2014
0voteA: 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 byon Friday, 31 October 2014
0voteA: 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 byon Wednesday, 30 April 2014
0voteA: 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 byon Wednesday, 10 April 2013
0voteA: 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 byon Monday, 2 December -1
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