208 signal conditioning circuitry 208 is particularly suited to generate a pulse having a predetermined pulse width that is used to initiate the spinning of reels 209 in accordance with one embodiment of the present invention fig3 shows preferred transmitter circuitry 202 in accordance with one embodiment of the present invention in this embodiment a voltage level suitable for biasing transmitter circuitry 202 is preferably applied to a node 226 when slot machine 102 becomes active e g when a player inputs a credit although any suitable voltage level may be applied at node 226 the preferred voltage level is about 5 volts that is passed to a light emitting diode 220 also shown is a decoupling capacitor 224 that is used to filter noise and prevent fluctuations in the light being emitted by light emitting diode 220 in an alternative embodiment where a more compact circuit arrangement is desired decoupling capacitor 224 may be omitted further included is a current limiting resistor 222 that functions to limit a current drain to ground and enables light emitting diode 220 to output a sufficient level of light that is preferably directed at lensing system 204 as shown in fig2 in this example light emitting diode 220 preferably shines a red light at lensing system 204 however any suitable color shield may be used to change the color of the light being emitted by light emitting diode 220 fig4 shows receiver circuitry 205 in accordance with one embodiment of the present invention as described above when a player bets a credit 5 volts will.