Logic gates. Circuit board designed for testing logic gates. A set of inputs, comprising switches, a light dependent resistor and a thermistor connect via logic gates to a set of outputs. These can be wired so as to produce different set-ups. A NOT gate has one input. It will output the opposite of this (so on goes to off and vice versa). An AND gate outputs if and only if both its inputs are on. An OR gate outputs if one or more of its inputs are on.