5mm LDR – 1No. Buzzer – 1No. Diode (1N4007 or 1N4001) – 1No. Capacitor, 47uF(Electrolytic) ... Fridge Door Alarm Circuit Diagram and Explanation: The two 555 timers are connected in Astable ...

Circuit Diagram . Complete circuit diagram for Automatic Fence Lighting with Alarm is shown above. LDR is placed facing towards the entrance and a potentiometer is used to adjust the sensitivity of ...

As you probably know the LDR is a light dependent resistor. Normally the resistance of an LDR is very high, sometimes as high as 1MΩ, but when they are illuminated with light resistance drops ...

Laser Alarm System - Step-by-Step Guide. Components Required: Arduino Uno (or compatible board) Laser Diode (or laser pointer) LDR (Light-Dependent Resistor) or Phototransistor; 10kΩ Resistor (for LDR ...

The alarm becomes active at sunset and remains ‘on’ till morning. The flashing light-emitting diodes (LEDs) and beeps from the unit simulate the functioning of a sophisticated alarm system. Besides, ...

LM1801 special-purpose IC ,which is designed especially for smoke detectors, provides us building this circuit by using the minimum number of components. It includes one internal zener supply, two ...

(laser diode used by the author) (laser beam sender circuit diagram) Laser Beam Receiver Circuit. Forepart of this circuit section is a 5mm photoresistor (LDR).This component is used to trigger the ...

Smart Street Light Control System using 555 Timer IC, LDR, and Relay. - MeheliR/ece_mini_project. Skip to content. Navigation Menu ... LDR-1: Diode: 1N4007: 2: Resistor: 1KΩ: 2 ... Please refer to the ...

The circuit should be placed in fire-prone areas such as a kitchen. Fire alarm using 555 IC Fire Alarm using 555 timer. Everyone is aware that when anything catches fire, smoke is produced. When this ...