Using conventional components and a small single sided PCB, the nightlight has proven to be very popular with pupils.  It can inspire creative, individual work from students and enable them to design and make a quality product of which they are proud and want to keep.

Illumination by a high brightness LED is controlled by an LDR and timer circuit.  When the light level on the LDR changes from light to dark, the LED is switched on for a time period set by the timing components.  With suitable timing component values, the delay can be set to15 minutes or more.  At the end of the timing period, the LED switches off.  The LED remains off until the timer is recharged by light falling on the LDR.  The quiescent power drain of the circuit is so low that an on/off switch is not required. Supplied with batteries (4 x AAA)