Block diagram:
Power supply Light sensor
Unit
Transducer driver Inverter
Bulb
This is how the whole circuit device works
The power supply, which is the main sour of power, is connected to the light sensor, that is the sensor that senses the light around the area. This light sensor is connected to the inverter, which will send signals of what the sensor has decided to do. The inverter will then send of these signals to the transducer driver. After that the transducer driver will receive the current voltage signals in order to turn in the light bulb or to switch it off.
This electronic circuit that I am producing can be considered as a three staged system.
First of all there is an input stage, which means it changes something from the outside into an electrical signal. The input that I have used is the power supply as used on the LDR, which means light dependant resistor (also known as light sensor).
Next is the processing stage. Which is what makes the electrical signal bigger, smaller or even compare it to the electrical signal. The processing devices that I have used are the inverter and the transducer driver.
Finally the output stage. Out put stage is what changes the electrical signal back into something. The out put device for this circuit is the bulb.
The only changes that I made were
At first I used the following components:
But they all do different jobs in different ways, which is way to complicated for my ciruit, especially if I wanted it to automatically go on and off. So the decision that I approached for this problem was to use an inverter, because it does all those things that the not gate, infrared sensor, and the switch do.
After building the circuit before testing it I used a voltmeter to measure the voltage and made sure that each component was working. But when I measured the amount of voltage in the bulb unit, there was some voltage passing through but the bulb didn’t turn on, so I realised that the bulb wasn’t working, and then I changed the bulb and tried again, by blocking light from the light sensor.
Also after making sure that every component on the circuit was working, I reduced the voltage by twisting the rotator potentiometer (controls voltage). I then blocked the light from the light sensor from about 7 inches away and the (l.e.d) didn’t work in order to switch on the light bulb, which means I had to cover the light sensor completely to make it work.
But when twisting the rotator potentiometer increased the voltage, the sensitivity of the light sensor increased, which means that when I cover it at 7 inches away the bulb will quickly switch on.
