SLOT: Lap timer for Slot and RC cars with arduino, you need an ardunio, IR sensor and LCD serial with i2c module which is a lap timer for a min. The actual PIR Sensor i. dependent on several variables. 5Pcs Speed Sensor Module Slot-Type Ir Optocoupler LM Voor Arduino Groove Koppeling Sensor V-5V Aansluiten Relais Buzzer ; Suministros para manualidades. e. Module slot unobstructed, receiver tube conduction module DO output low, shelter, DO output high. Module DO connected to the relay. Arduino Module. Arduino sensor slot de calidad con envío gratis a todo el mundo en AliExpress. Find many great new & used options and get the best deals for Slot Type IR Optocoupler Speed Sensor Module LM for Arduino / 51 / AVR / PIC at the best. the one which is covered with a lens, consists of two slots and both these slots are made up of IR. . Product Name: Slotted Optical Switch; Model: HYH; Output Type: Photo Transistor; Peak Emission Wavelength: nm; IR Diode Forward Current: 50mA;. Consisted of an infrared emitter and a phototransistor, is located face-to-face on the optical axes in a leaded [HOST] operation, output phototransistor.