Connect the Buzzer to the Relay Module: Connect one end of the buzzer to NO (Normally Open) and the other end to COM (Common) on the Relay Module. Upload the Code: Open the Arduino IDE and create a ...

If so, remember to connect the VCC pin to 5V of the Arduino board to enable the control input pins IN1 and IN2. Also note at this point that, if you want perfect galvanic-isolation, do not link ...

Looking for practical Arduino projects? This guide shows how to control a relay from your smartphone using an Arduino Uno — either via Bluetooth or Wi-Fi.

I have used D1, D2, D5 & D6 GPIO pins to control the 4 relays. **The Boot will fail if RX is grounded during the Boot process of NodeMCU. So, connect the LoRa module after giving the supply to NodeMCU ...

Project Hardware Software Selection Here Arduino micro-controller board is used as it is portable and easy to use and the cost is not high. There are various types of Arduino boards like Arduino Uno, ...