Smart sensor desk lamp

Design Scheme: The digital display photosensitive eye-protection LED light is powered by a 220V AC power supply, which is converted to 5V DC power by a power module to supply power to the GD32 microcontroller. The microcontroller controls the entire circuit. First, the ultrasonic sensor detects a person approaching and automatically turns on the circuit; if the person leaves, it automatically turns off. When the circuit is on, the photosensitive sensor detects the ambient light brightness and transmits the signal to the microcontroller. The microcontroller uses the signal returned from the photosensitive sensor to change the magnitude of the signal sent to the LED lights (such as the duty cycle of the PWM wave) and displays the brightness level through four LEDs. The signal sent by the microcontroller to the LED lights is then directly supplied to the LED lights through a dimming circuit and an amplification circuit, causing them to turn on and off.