This kit allows you to illuminate the edge of a picture frame using a number of LEDs. This happens for a period of time when the button is pressed. The duration is set using a trimmer potentiometer and can be anything from a few seconds to 30 minutes. The student can choose which LEDs they would like to use. These are connected to the terminal block (along with a current limit resistor). The board can drive 200mA, which is about 10 high brightness LEDs.
This kit includes:
- 1 x PP3 Clip lead
- 1 x Battery holder (3x AA)
- 1 x Terminal block (2 way)
- 1 x Push to make switch
- 1 x Capacitor, electrolytic, 16V, 220uF
- 1 x 10M Pot
- 2 x 10K resistor 5%
- 2 x N channel FET (2N7000)
- 1 x 0.5 metre length of single core wire
- 1 x Picture frame LED driver PCB
PCB dimensions: 58mm x 28mm.
This kit is supplied as a pack of parts and requires soldering.
Selecting LEDs for using with the circuit.
The circuit can be used with a variety of LEDs. Below are a selection of LEDs that can be used. Also listed is the current limit resistor that will be required if four LEDS are used.
|3504 Standard red||33ohm|
|3505 Standard green||33ohm|
|3506 Standard yellow||33ohm|
|3542 Standard white||22ohm|
|3543 Standard blue||22ohm|
|3507 Ultra bright red||33ohm|
|3524 Ultra bright white||68ohm|
|3537 Ultra bright blue||68ohm|
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 2146.
Note: this service is only offered to schools for evaluation purposes only.
This kit is designed and manufactured in the UK by Kitronik.
A video about our LED Picture Frame Kit 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 Brian, The LED picture frame kit can drive up to 200mA, which is around 10 high brightness LED’s. We don’t stock any 3mm colour changing LED’s, however the 5mm we stock take around 25-50mA depending on the colour it displays. As such you would likely only be able to run around 4-6 colour changing LED’s. The best option would be to work out the total amount of current you would need with the 17 LED’s in parallel, then find a power supply that is best suited to the requirements.Posted byon Friday, 3 February 2017
As per your previous question this kit isn’t designed to run off 12V’s. The push button switch is only used to trigger the circuit, as there is no power switch on the circuit it is in a constant state of monitoring for the switch being pressed. If you want to conserve power you would need to add a power switch between the positive wire on the battery box and the positive input on the PCB.Posted byon Friday, 18 December 2015
We dont do this kit with a USB power lead, this is the only version we stock.Posted byon Wednesday, 25 November 2015
Batteries will slowly discharge over time, also this circuit isn’t designed to work off 12V’s and as such there may be some current leaking through the circuit.Posted byon Monday, 16 November 2015
You could use a different transistor with a higher current rating such as the BC337. This has a maximum continous current rating of 800mA. If you need more current than that you likely need a different circuit like a motor driver board or similar.Posted byon Friday, 2 January 2015
The capacitor won’t have any impact on the output of the board, this will just increase the time of discharge and thus the LED’s will light for longer. The FET will determine the maximum output, in this case the maximum the FET and board can handle is 200mA.Posted byon Tuesday, 23 December 2014
0voteA: You really need two circuits to do this. The first one you want is , it deals with turning the outputs (LEDs in your case) on when it gets dark. Then you want a second circuit consisting of 4x Rechargable AA batteries in a 4x AA holder wired in series with 2x 3V solar cells and a diode. This will charge your batteries when it's light. If you connect the output of the batteries to the power input of the first circuit that should do what you are looking for.Posted byon Tuesday, 28 October 2014
0voteA: Although the board is supplied with a 3x AA battery box, giving a typical voltage of 4.5V there is nothing on the board that would stop it from running off 12V. That said the way the timing works in the normal circuit is to fully charge a capacitor to 4.5V when the switch is pressed and then discharge it slowly through the trimmer potentiometer. The FET that detects the capacitor voltage switches at about 2V or 2.5V remaining across the capacitor, which is approximately when the capacitor is half discharged. Swap the power for 12V and it will only have to discharge 2V of 12V about a sixth rather than a half so the max duration will be reduced to around 10 minutes. The max output current of the board is 200mA so you would need to make sure that the LED strips took less power than that or added a relay to the output of the board. If 200mA is not enough power then you might be better using the relay board kit which drives much larger loads.Posted byon Monday, 6 October 2014
0voteA: Given you are looking to keep the same maximum time, the capacitor C1 is currently a 220uF and there shouldn't be a problem increasing it to a 1000uF which should sort the time delay out, though you would need to give it a try.Posted byon Tuesday, 7 October 2014
0voteA: We sell a PIR detector but if you are looking to use it you would be better off designing your system using a microcontroller like an Arduino Uno instead of using this LED picture frame kit. https://www.kitronik.co.uk/products/sparkfun-electronics-products/add-on-modules/pir-motion-sensor/ .Posted byon Wednesday, 23 October 2013
0voteA: Yes it is possible for schools to request a free sample of this kit. The easiest way to do this is to fill in the online form which can be found by clicking on the samples icon (the PCB) in the product description or by navigating on the top menu to services > samples.Posted byon Wednesday, 27 June 2012
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