Electronic circuit for the light

It was stated in the brief that the light needs to be able to turn it self on when the light levels drop and be able to turn it self  off again when the light levels become light again.

I found a circuit from maplin which you make up yourself.  The circuit was a LDR (light dependent resistor) sensor, it had capabilities to be fitted to mains electric and have the whole thing powering a bulb (max 12v), being that i was using a LED (12v) bulb this would be fine.

The circuit diagram i used for this can be found at LDR circuit .

This can also be simply translated in Crocodile clips.

   

This can also be designed in circuit wizard:

  

In both the circuit wizard and crocodile clips diagrams both illustrate that when the light levels drop the light turns it self on, then when the light level comes back up the light turns it self off.

    

Using a digital Multimeter you can find out on your 3OO Ma AC adapter which lead is negative and which is positive, the lead needs to be striped back and soldered onto the power jack on the circuit board.

The Bulb is a 12v, 20 LED bulb for the white acyclic piece, the piece is having one bulb, the LEDs are red and gives a nice red glow to the light.  The Bulb needs to be connected to the terminal block and power supply.

The red piece has two tiers to it therefore requires two bulbs, otherwise if there was only one bulb only part of the light would be lit up.  The bulbs are 12v, 20 white LED bulb, two bulbs can be fitted to the circuit by having them wired up parallel, then the power is being shared out equally and it saves you from having to have to circuits for this piece.

The LDR wants to be connected to wires so that it comes out from the circuit board, this is the part that senses the light, therefore it needs to be able to catch the light.

 

   

~ by katiebirchmore on January 12, 2008.