Simple LED watch circuit powered by a 3v button cell battery (Multiplexing). When activated by user it should light up for a short while (3-5 seconds). In short a very standard circuit.
This is for a prototype so the cost should be low, but a key feature is that the circuit can be bend i.e build as a flexible circuit.
Also it needs to be thin so SMD led's or very small LED should be used.
will need 1-3 build