I made a “lie” detector circuit. In order to create it i used 3 leds and 3 resistors (and wires). One of the problems I encountered was that I did not place the leds correctly at first so the circuit did not work. I then realised that and changed the way I placed them. From making this circuit I learnt that I have to be patient and pay attention to every detail (such as how to put the leds in the breadbord in the correct way).