6 Automatic Street Light Circuits [using Transistors, IC 555, Solar Panel]
In this article we will discuss 6 useful yet simple automatic street light circuits, which can be used for automatically switching a lamp ON during night time and OFF during day time.
What is an Automatic Street Light System
An automatic street light system is a device which detects the ambient light level conditions and automatically switches an attached lamp ON/OFF depending on the level of the ambient light.
During evening when it is too dark and the light level decreases below the detecting threshold of the device, it turns ON a connected lamp to illuminate the premise.
Conversely, at dawn when the ambient light increases above the detecting threshold of the device, it turns OFF the connected lamp. This automatic ON/OFF switching of the lamp during day and night keeps repeating everyday, automatically, without any human intervention.
What is the advantage of an Automatic Street Lamp System?
The main advantages of using an automatic street system are as follows:
It saves electricity by ensuring that the lamp never remains switched ON at day time, and is switched OFF when the ambient light condition is adequate to illuminate the streets naturally.
It saves manpower by ensuring that no human intervention is required for switching the lamp ON/OFF manually.
Removing human dependency saves money and time, allowing the system to be very cost effective.
Being an electronically monitored system, the operating accuracy of the device is very high and efficient
Can we Build this at Home
However, the person who wants to build this circuit must have all the basic knowledge of electronics and must know how to solder electronic components correctly.
1) Automatic Street Light using a Single Transistor
The first circuit diagram below shows how a reasonably good automatic street lamp could be built using a single transistor, an LDR, a few resistors and a relay.
All resistors are 1/4 watt 5% CFR
R1 = 1K
P1 = 10K preset
LDR1 = Any standard LDR
C1 = 220uF/25V electrolytic Capacitor
C2 = 10uF/25V Electrolytic Capacitor
C3 = 1000uF/25V Electrolytic Capacitor
D1----D5 = 1N4007 Diodes
T1 = BC547 Transistor
TR1 = 0-12V/500mA or 1Amp Transformer
RL1 = 12V Relay 200 to 400 ohm coil resistance
LED Bulb = LED bulb 220V/120V, 100 watt or as per street light requirement.
The working of the circuit is simple. During day time when the ambient light is sufficiently high, the LDR has a low resistance. Due to this low resistance it keeps the transistor base more towards the positive level, causing the transistor base at the required 0.6V. The transistor therefore remains switched ON.
With the transistor in the switched ON condition, the relay also remains activated with its contacts resting on the N/O position.
6 Automatic Street Light Circuits [using Transistors, IC 555, Solar Panel]
In this article we will discuss 6 useful yet simple automatic street light circuits, which can be used for automatically switching a lamp ON during night time and OFF during day time.
What is an Automatic Street Light System
An automatic street light system is a device which detects the ambient light level conditions and automatically switches an attached lamp ON/OFF depending on the level of the ambient light.
During evening when it is too dark and the light level decreases below the detecting threshold of the device, it turns ON a connected lamp to illuminate the premise.
Conversely, at dawn when the ambient light increases above the detecting threshold of the device, it turns OFF the connected lamp. This automatic ON/OFF switching of the lamp during day and night keeps repeating everyday, automatically, without any human intervention.
What is the advantage of an Automatic Street Lamp System?
The main advantages of using an automatic street system are as follows:
It saves electricity by ensuring that the lamp never remains switched ON at day time, and is switched OFF when the ambient light condition is adequate to illuminate the streets naturally.
It saves manpower by ensuring that no human intervention is required for switching the lamp ON/OFF manually.
Removing human dependency saves money and time, allowing the system to be very cost effective.
Being an electronically monitored system, the operating accuracy of the device is very high and efficient
Can we Build this at Home
However, the person who wants to build this circuit must have all the basic knowledge of electronics and must know how to solder electronic components correctly.
1) Automatic Street Light using a Single Transistor
The first circuit diagram below shows how a reasonably good automatic street lamp could be built using a single transistor, an LDR, a few resistors and a relay.
All resistors are 1/4 watt 5% CFR
R1 = 1K
P1 = 10K preset
LDR1 = Any standard LDR
C1 = 220uF/25V electrolytic Capacitor
C2 = 10uF/25V Electrolytic Capacitor
C3 = 1000uF/25V Electrolytic Capacitor
D1----D5 = 1N4007 Diodes
T1 = BC547 Transistor
TR1 = 0-12V/500mA or 1Amp Transformer
RL1 = 12V Relay 200 to 400 ohm coil resistance
LED Bulb = LED bulb 220V/120V, 100 watt or as per street light requirement.
The working of the circuit is simple. During day time when the ambient light is sufficiently high, the LDR has a low resistance. Due to this low resistance it keeps the transistor base more towards the positive level, causing the transistor base at the required 0.6V. The transistor therefore remains switched ON.
With the transistor in the switched ON condition, the relay also remains activated with its contacts resting on the N/O position.
No comments:
Post a Comment