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.

Components Required To build an RFID Door lock system, we will need a few essential components. Here is a simple list of what you will need to start. Arduino UNO R3 Development Board RC522 RFID Reader ...

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 ...

Circuit Diagram The circuit diagram for the Automatic Bottle Filling System using Arduino is given below. I have used Fritzing to draw the circuit diagram. In this circuit, Solenoid Valve is connected ...

Fig. 1: Block diagram of the school bell with alert Fig. 2 shows circuit diagram of the school bell that works on 12V battery or adaptor. The project uses a voice recorder/playback module, which ...

Configure the System: Open the Arduino IDE and load the provided Arduino code onto your Arduino board. Adjust threshold values for soil moisture levels, pump activation times, and relay pin ...

The circuit diagram of the weather station with device control is shown below. It comprises Arduino Uno Board, DHT22 temperature and humidity sensor, BC548 transistor T1, a 5V single changeover relay, ...