An actuator comprises an elongated shape-memory element wound around a first element and having one first end connected to the first element and one second end connected to a second element. The battery compartments are separated from each other by a gap which contains the electronics for the camera. Each fastener comprises a frame body having a gap defined at a top portion thereof. Coverage bits are associated with respective sample locations within a pixel. A plurality of atomic queries is generated. The measurement circuitry is calibrated with respect to the first input terminal according to signals received from the second input terminal while measuring temperature according to signals received from the first input terminal.