2 presents the circuit diagram for the fire alarm using a flame sensor and Arduino Nano ... a 12V voltage regulator (LM7812), and a flame sensor module connected via CON2. It includes a 12V SPDT relay ...

This project describes how to make the alarm ... Channel relay module is connected with switch S7, this is an “OK / ENTER” switch for the radio. This S7 switch has to press each time we change the ...

This project demonstrates how to build an Intruder Alarm System using an HC-SR501 PIR ... the components as described in the circuit diagram. Ensure that the PIR sensor is connected to digital pin 2, ...