Automatic Street Light Controller 2003
Introduction
Aim of the project
Block diagram
Components used
Rectifier diodes
Transistor
78XX regulator IC
NE 555 Timer IC
Resistor
Capacitor
Relay
Circuit diagram
Circuit operation
Applications
Advantages
Disadvantages
Limitation
Future scope
Conclusion
Bibliography
Introduction:
We have seen many more times that our street light were turned On even inday time also. This shows that we are wasting much power even it may be saved and supplied for any crop fields for several hours. Here in this project we had designed a simple and cost less circuit using 55 timer ic and LDR (light dependent resistor).
Aim of the project: Our main objective of this project is to design and implement a low cost street light controller. This circuit uses a single 555 Timer Ic and LDR (light dependent resistor) and a relay.
This circuit uses only 9 volts for effective performance. When light is high on the LDR the resistance of LDR will be very less. Here 555 timer IC is configured as a monostable multivibrator. The LDR will trigger the 555 timer. The output of the 555 timer IC is directly fed to the baser of the transistor. This gives low signal and it turns ON the coil voltage of the relay. Street lights were connected to relay.
Block diagram:
Components used:
R1-560E
R2-10K
LDR
555 Timer IC
7809 regulator IC
VR1-10K
D1-D2- 1N4001
D3-4148
LED -5mm red colour
Q1 – BC 547
Relay -6v DC
C1-2200uf 25v
C2- 220uf 25v
C3-100uf 50v
C4-0.1uf
C5-100nf
C6-0.1uf
Rectifier diodes:
Rectification: Simply defined, rectification is the conversion of alternating current (AC) to direct current (DC). This involves a device that only allows one-way flow of electrons. As we have seen, this is exactly what a semiconductor diode does. The simplest kind of rectifier circuit is the half-wave rectifier. It only allows one half of an AC waveform to pass through to the load. (Figure below)
Half-wave rectifier circuit.
For most power applications, half-wave rectification is insufficient for
Aim of the project
Block diagram
Components used
Rectifier diodes
Transistor
78XX regulator IC
NE 555 Timer IC
Resistor
Capacitor
Relay
Circuit diagram
Circuit operation
Applications
Advantages
Disadvantages
Limitation
Future scope
Conclusion
Bibliography
Introduction:
We have seen many more times that our street light were turned On even inday time also. This shows that we are wasting much power even it may be saved and supplied for any crop fields for several hours. Here in this project we had designed a simple and cost less circuit using 55 timer ic and LDR (light dependent resistor).
Aim of the project: Our main objective of this project is to design and implement a low cost street light controller. This circuit uses a single 555 Timer Ic and LDR (light dependent resistor) and a relay.
This circuit uses only 9 volts for effective performance. When light is high on the LDR the resistance of LDR will be very less. Here 555 timer IC is configured as a monostable multivibrator. The LDR will trigger the 555 timer. The output of the 555 timer IC is directly fed to the baser of the transistor. This gives low signal and it turns ON the coil voltage of the relay. Street lights were connected to relay.
Block diagram:
Components used:
R1-560E
R2-10K
LDR
555 Timer IC
7809 regulator IC
VR1-10K
D1-D2- 1N4001
D3-4148
LED -5mm red colour
Q1 – BC 547
Relay -6v DC
C1-2200uf 25v
C2- 220uf 25v
C3-100uf 50v
C4-0.1uf
C5-100nf
C6-0.1uf
Rectifier diodes:
Rectification: Simply defined, rectification is the conversion of alternating current (AC) to direct current (DC). This involves a device that only allows one-way flow of electrons. As we have seen, this is exactly what a semiconductor diode does. The simplest kind of rectifier circuit is the half-wave rectifier. It only allows one half of an AC waveform to pass through to the load. (Figure below)
Half-wave rectifier circuit.
For most power applications, half-wave rectification is insufficient for
Bibliography: Modern electronics “e-magazine” Basic electronics by R.V. Subbarao Electronics for u “magazine” Images and other materials: www.wikipedia.com www.electronicsforu.com www.google.com/images