Providing a count

Apparatus comprises two or more rotary encoder switches 101, 102, 103, each of the two or more rotary encoder switches being commonly connected to first and second signal lines J, L, each switch being operable to provide signals on the first and second signal lines which are dependent on a direction of rotational actuation of the switch by a user. A receiver 100 is connected to the first and second signal lines so as to receive the signals from the two or more rotary encoder switches, the receiver comprising a counter circuit (see figure 2) operable to determine a count in response to changes in the signals, the receiver being arranged to provide the count at an output. The count may be provide to a lighting control circuit 107 (see also figure 5) such that plural lights may be controlled on the basis of the count provided by the receiver. Each rotary switch may include an output transducer 106, for example a light emitting diode (LED).