The reference design is composed of two photoelectric sensors.The photoelectric sensors are devices that function similarly as ultrasonic sensors but it does not emit ultrasonic waves, instead it uses infrared light to detect the absence or presence of an object. The reference design features the PM-K45 photoelectric sensors from Panasonic Industrial Automation Sales, which functions as an input signal to trigger emergency drawer lock. The design uses ATTiny85 as the MCU process the output of the sensors. The output of the reference design will be an emergency lock mechanism. Read more