When the alarm is armed there is a 30 second countdown before it is active. There is also a 30 second buffer to disarm the alarm after it is triggered. The alarm system uses an LCD display, sound ...

Today we are adding one more Security Alarm in our list which is based on Ultrasonic Sensor. This Arduino Controlled Door alarm can be installed near the door to detect the presence of anybody at the ...

Contribute to damlacim/ultrasonic-sensor-alarm-system development by creating an account on GitHub. Skip to content. Navigation Menu Toggle navigation. Sign in Product ... We are developing an arduino ...

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 ...