This research designs and builds a device capable of sorting and counting the number of items automatically by utilizing the working principle of a laser sensor. The system is controlled by an ATmega8535 microcontroller, enabling it to operate without manual intervention. The main components of the system include an item detection sensor, a control unit, a conveyor, and a power supply. The detection process is carried out using an ATmega8535 microcontroller, laser, photodiode, LCD, and computer display. System testing includes testing the sensor circuit, servo motor, and automatic sorting and counting functions. When the laser sensor detects an object, the data is sent to the microcontroller and then displayed on the LCD screen and computer. The system is also equipped with an automatic separator bar to separate acceptable and unacceptable items using a DC servo motor. The system's detection accuracy reaches 95–100% with an error margin of 0–5%.
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