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#AUTOMATIC TIMER CONTROLS RELAY CODE#

In this circuit, LDR and 10KΩ Resistor form one potential divider pair, which is used to provide a variable voltage at the non-inverting input (that is Pin 3).

Pins 2 and 3 of these IC are used to compare the voltage and give us an output as high or low depending on the voltages at the input pins. In this circuit, we used IC LM358, which is basically an operational amplifier. The working of circuit is very much easy to understand. Working of Automatic Street Light Controller Switch Circuit Automatic Street Light Controller Circuit Simulation Video (Old Circuit) NOTE: The Relay module used in this project is an active LOW Relay.

Number of electrical associates (N/O and N/C).

The maximum voltage which we will acquire in the output.

The voltage and current required to strengthen the coil.

Factors for Selecting an appropriate Relay The relay is extremely useful when you need to control a large amount of current or voltage with the small electrical signal. It provides isolation between the controller and the device because as we know devices may work on AC as well as on DC but they receive signals from microcontroller which works on DC hence we require a relay to bridge the gap.

#AUTOMATIC TIMER CONTROLS RELAY CODE#

Value of resistance can be calculated with the help of multimeter or with the color code that is visible on the resistor. Ii) Variable Resistor – whose value of resistance can be changed for example if we have a resistor of 5K then the value of resistance will vary from 0 to 5 k. I) Fixed Resistor – having a fixed value of resistance A current that flows via a resistor is directly proportional to the voltage that appears across the resistor. It is a passive component having two terminals that is used to manage the current flow in the circuit.

If you got the satisfactory result, then your LDR is good. Now, cover the LDR properly so that no light falls on it and once again measure the resistance. Measure the resistance of LDR in the light or brightness and the resistance must be low. For testing LDR set the range of multimeter in resistance measurement. Testing of LDRīefore mounting any component in the circuit it is a good practice to check whether a component works properly or not so that you can avoid consumption of time in troubleshooting. In the time of darkness or when there is no light, the resistance of LDR is in the range of mega ohms, while in the presence of light or in brightness in decrease by few hundred ohms. When the strength of the light falling on LDR increases the LDR resistance decreases, while if the strength of the light falls on LDR is decreased, its resistance increased. LDR is a device whose sensitivity depends upon the intensity of light falling on it. It is available ib 8-pin DIP Package and can be used in several configurations like Amplifier, oscillator, comparator etc. To get an idea about the circuit built using microcontroller, read the post: Street Lights that Glow on Detecting Vehicle Movement. Note: This circuit can also be built using microcontroller. Along with these, a few more components are also used.Ĭircuit Diagram of Automatic Street Light Controller Switch Circuit LDR (Light depending resistor), whose resistance is based upon the quantity of the light falling on it, is the main component for sensing the light. The whole circuit is based on IC LM358, which is basically an operational amplifier that is configured in a voltage comparator.

The power consumed by the circuit is very low because of the very few components used in the circuit. This circuit is very easy to work around and also it is battery operated. It is lit well enough to see the objects nearby. Many people have a phobia of darkness, so to assist them in such situations, we have explained a simple circuit that will automatically turn on the street light consisting of LEDs or bulb coupled with relay. Automatic Street Light Controller Project Output Video.Working of Automatic Street Light Controller Switch Circuit.Automatic Street Light Controller Circuit Simulation Video (Old Circuit).Factors for Selecting an appropriate Relay.Circuit Diagram of Automatic Street Light Controller Switch Circuit.