The ‘Embedded Based Smart Street Light System’ as name implies used with street lights or in-door light systems to reduce power waste and maintain over-all portability.
Normally street lights are switched on by evening and off at morning. Even though there is no considerable traffic on the road they will be ON whole night and wasting power unnecessarily. To avoid this situation the intended embedded system is designed.
Objective: To minimize street lights on-time by monitoring
- Vehicles or person on road, if found switch on lights for predefined time.
- Availability of sun, if not found switch on lights for predefined time.
- RTC or Real Time clock to switch on/off lights, such as at midnight full shut down is programmed etc.
Learning curve:
The System is built around ATmega8 Microcontroller. The code does all the controlling part of the system.
The memory burnt chip's code monitors' PIR, LDR, RTC and using RTC shows current time on Display module LCD.
The On-chip peripheral ADC of Microcontroller chip is used to detect sun’s presence on light sensor LDR, which is connected to chip’s input pin.
The PIR sensor module is used to detect person/vehicle on monitoring road.
The Microcontroller chip is interfaced with RTC module and uses the current time value in its analysis and takes appropriate action, such as shutting down system at mid-night when No Traffic is seen etc. Here I2C two wire interface protocol is used to communicate between Microcontroller chip and RTC Module.
In monitor mode system, if any interference is detected at PIR Module, LDR value change as no sun light detected or RTC time value equals user set time switches ON the street lights for predefined time interval and OFF it to preserve power loss.
Objective: This embedded system minimizes street lights on-time by monitoring three input modules PIR, LDR and RTC module connected to its input pins. The code does all monitoring and controlling part, portability and converting set values is very easy as per user requirement.
Note that instead of switching on/off as and when and reducing lifespan of the street lights, controlling their intensity with respect to outer world is better option [using PWM technique]. This feature is not implemented in this system.
Applications:
- Such system/project can be used to control lights of monitoring room automatically, such as stadium, street lights, Utility Buildings, ware houses etc.
- By employing PWM [Pules Width Modulation] technique user can vary the intensity of street lights, instead of as when making it On/Off.
Title: Microcontroller Based Smart Street Light System
External Links: electronicshub.org
- Street Light that glow on detecting vehicle movement
Keywords: Microcontroller, ATmega8, ADC, RTC, PIR, LDR, LED Array
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…till next post, bye-bye & take care.
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