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.

In the transmitter LoRa circuit, I have used Arduino Nano. I have made a voltage divider using 4.7k and 10k resistors to drop down the 5-volt logic level to the 3.3-volt logic level. The pushbuttons ...

Relay Circuit Setup: After that we have connected the relay module in series with our electrical load, so that we can break the connection when we want to turn the device off and complete the circuit ...