Smart lighting control. Done by : Haya S alah Esraa N abulsi Eman D wikat Under the supervision of: Dr. K amil Subhi. Background. Why A Smart lighting control?.
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Done by :
Under the supervision of:
Energy consumption is in a great increase all over the world so that required us to use engineering techniques to reach the optimum consumption of electricity by having the building automatically controlled (by using sensors, dimmable lighting units and controllers.….. etc).
Lighting of a room for its intended use at the exact lighting level can help sufficiently saving energy.
We will control the dimming of the light load according to dimmer theory by using:
Project is built according to the dimmer theory based on power electronics as illustrated bellow.
The following schematic demonstrates a basic type of dimmer:
The operation of the dimmer is based on the fact that, during a full cycle of an AC waveform, a triacwill only allow a part of the waveform to be delivered to the load (lamp).
Take a look at the following waveforms:
This consists of the components and the operation of each circuit we built and these circuits are:
its a combination of two distinct Devices:
The two are Separated by a transparent barrier which blocks any electrical current between them
components we used in this circuit are :
A light detector senses light. As the light level increases and LDR meets the lowest threshold resistance, the circuit automatically turns on the LED D1. We can adjust the sensitivity using the resistor R2.
We connect this circuit to arduino by connecting the collector of transistor to the analogue Pin of arduino (A0).
LDR writes an analog value (PWM wave) to a pin, and so it can be used to light a LED at varying brightnesses.
Control the output pulse from arduino to control firing angleIf keypad value<sensor value
Enter the required illumination from keypad and compare it with sensor value
If keypad value>sensor value
If keypad value=sensor value
No change in lamp lightening
Decrease the lamp lightening
Increase the lamp lightening
We get this result because we used full wave rectifier that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.
When the rectified signal reaches zero the optocoupler give pulse.
This signal then can be used to trigger an interrupt in the Arduino(pin2).
Synchronizing between the output of the arduino (pin 13) and the output of optocoupler.
We control the output of the arduino by change the delay (in ms) after the zero crossing to give pulse.
Blue signal:output of optocoupler.Red signal: output of the arduino
At delay 50ms