Automatic Light On Off Circuit Using Ldr
When intensity of light that falls on the ldr is less resistance of the ldr is high and this causes more voltage drop across ldr.
Automatic light on off circuit using ldr. Here we have used an ac bulb as street light. 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 transistor q1 will drive the transistor q2 to turn on the relay. During day time ldr gives a low resistance as a result the voltage through base is greater than 5v which switches the current to the emitter.
It automatically switches off lights when sunlight fall on it i e on ldr e g in morning by using a sensor called ldr light dependent resistor which senses the light just like our eyes. Automatic light operated controlled switch circuit using ldr is very interesting circuit idea. Ldr light dependent resistor relay. When light is low.
Light intensity falling on ldr is less. This circuit is very simple circuit and can be built with transistors and ldr you don t need any op amp or 555 ic to trigger the ac load. Along with these a few more components are also used. Working of automatic street light project using ldr with arduino arduino.
Circuit diagram of automatic street light controller switch circuit components used in this circuit. Ldr detects the light. The automatic street lights using ldr work according to the light. By this light activated switch in day light will automatically switched off and at night switch on light.
The system is highly sensitive. This turns led off. Some applications of this circuit are street light controlling home office light controlling day and night indicators etc. You can use this for automatic light switch for street light.
Power supply 12v 1. The lights are turned on if the light is below a specific value. A simple dc motor electrical project. When there is high at base of q1 it will turn on.