5 LDR Circuits: Latching, Timers, Light & Dark Sensors || Step-by-Step Tutorial

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A tutorial showing five ways in which LDR can be used to make light/dark sensing circuits:

1. Dark Sensor Circuit - LED (output) glows when darkness detected
2. Light Sensor Circuit - LED glows when light detected
3. Latching Circuit - LED glows until any obstacle cuts the latching mechanism
4. Dark Timer Circuit- LED glows for some time after darkness detection
5. Light Timer Circuit- LED glows for some time after light detection

CIRCUIT applied to PROJECT :
*Night Sensing Penstand

Forewords 0:00

Components Required:

1. Dark Sensor Circuit 0:23
• LDR
• Transistor: BC547
• Resistors: 47K, 330Ω
• LED

2. Light Sensor Circuit 1:22
• LDR
• Transistor: BC547
• Resistors: 1K, 330Ω
• LED

3. Latching Circuit 2:08
• LDR
• Transistor: BC547
• Resistors: 1K, 330Ω
• LED

4. Dark Timer Circuit 2:42
• LDR
• IC 555
• Capacitor: 47μF
• Resistors: 47K, 4.7K, 330Ω
• LED

5. Light Timer Circuit 4:30
• LDR
• IC 555
• Capacitor: 47μF
• Resistors: 47K, 4.7K, 330Ω
• LED

Other Requirements:
• Battery: 9V and battery clips
• Breadboard
• Breadboard Connectors

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Комментарии

Very well described and easy to follow. Many, many thanks.

jamesallen

Very great explanation.Can I use dark timer circuit as laser protection.

thoutamgattaiah

Hi, Many thanks for a clear expaination. Can I replace D1 with a relay to drive a load?

prefect

Please put a video, how to make light and dark timer circuit using transistor without
Overall I enjoy your circuits...

yogeshwaranp

5 LDR Circuits: Latching, Timers, Light & Dark Sensors || Step-by-Step Tutorial

5 LDR Circuits: Latching, Timers, Light & Dark Sensors || Step-by-Step Tutorial

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