Here, we are using a 4 relay module because we will only control four appliances. If you want to automate a different number of appliances, you can use a different relay module. There are many relay ...

one Arduino digital pin for each relay, by default pins 2 to 8 are used 1 to 8 relays which can be controlled with the voltage from your Arduino's IO pins check your board documentation: IO voltage ...

Power on the GSM shield with 12V, 2/3A power adapter and ensure the GSM module is connected to the network. Call the system from a whitelisted number to toggle the relay.

In this tutorial, we will build a electronic fire cracker using arduino and jq6500 mp3 module. Our Digital cracker makes a loud sound when we light up the thermistor.

LilyGo T-Relay-8 is an ESP32 WiFi & BLE board equipped with eight 5V relays supporting up to 250V AC or 28V DC, as well as 16-pin GPIO header for expansion. The board offers a more compact solution ...

Arduino based Fire Alarm – Circuit and Working Fig. 2 presents the circuit diagram for the fire alarm using a flame sensor and Arduino Nano. The system is powered by a step-down transformer (X1), a ...