Have you ever wondered how speed guns measure the speed of moving vehicles or how an athlete's sprint speed is recorded? Normally these speed sensors work with radar or laser technology to bounce back ...

DAOKAI 5PCS LM393 Comparator Speed Sensor Module Slot Type IR Optocoupler for Motor Speed Detection Also for MCU Arduino, with Dupont Wire Comimark 4PCS Tilt Sensor Module Vibration Sensor for Arduino ...

ACEIRMC 3pcs PCF8575 IO Expander Board Module I2C to 16IO IIC I2C I O Extension Shield Module 16 bit SMBus I O Ports for Arduino R3 (3pcs) EC Buying 10PCS IR Infrared Sensor Module Slotted Optical ...