The device relies on a BT139 Triac and a zero-cross detection circuit for precise AC voltage control, along with an onboard relay to enable a full AC on/off switch. With an integrated AC-DC module ...
A relay module is also connected to the ESP32’s GPIO 13, providing the ability to control external devices like additional lighting or security systems using gesture commands. The WS2812 LED strip is ...
An RTC (real-time clock) module ensures ... 2 shows the circuit diagram of the automatic school bell. It is built around Arduino Uno R3, 16×2 LCD display with I2C (MOD1), DS3231 RTC, 4×4 matrix keypad ...
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