Here we don’t need any external power supply circuit; we can power it directly from the PC USB port. For practical implementation, we can use an external USB power adapter to power up the NodeMCU with ...

Alert Message: The Arduino communicates with the GSM module to send an SMS alert message to predefined phone numbers, notifying them of the fire incident. Buzzer Activation: Simultaneously, the buzzer ...

This setup and code are designed to monitor power status and use the SIM800H module to send SMS alerts in case of a power outage or restoration. The hardware connections are straightforward, with the ...