DO NOT connect in any ways the main power supply that drive the LOAD to the arduino and transistor circuitry! Turn OFF the relay with delay You can use this code example to introduce a delay in your ...

Features: Hardware components: Arduino, relay module, jumper wires, and external power source Code: Arduino code for controlling the relay based on sensor input or a manual switch Applications: Home ...

Looking for practical Arduino projects? This guide shows how to control a relay from your smartphone using an Arduino Uno — ...

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 ...

All we need to do is swipe or place an authorized RFID card in front of the RFID reader. Here, Arduino handles data processing activities to decide whether the RFID card is valid or not. If the card ...