A Dark Detecting Light using IC 555

This is an interesting circuit idea which automatically ON the lights when there is a dark. This circuit is made by using an LDR and 555 timer IC. This concept can be used to build automatic lamps, night lamps, or we can also create a automatic morning alarm by using the very same concept.

This project is very similar to one that we have talked in Light Detecting Alarm. You can see here the circuit diagram and a step by step guide to make the circuit.

Demonstration of circuit can be seen in this video:

DC Motor Control using IC 555

DC motors are commonly used in embedded system applications. Sharing here a DC MOTOR SPEED CONTROL circuit which is bacially a 555 Timer IC based PWM (Pulse Width Modulation) circuit developed to get variable voltage over constant voltage. 

This DC motor control circuit explains in detail to control the speed and direction of a DC motor by using 555 timer IC.

Check more circuits here.

555 Timer Based Binary Counter Circuit

Here is another circuit using 555 timer IC as an ASTABLE MULTIVIBRATOR. This circuit makes an LED blink for every half second, and the square wave output of 555 IC is connected to a BINARY counter of 8bit (74HC4040).  Each time when a pulse is generated by timer, binary counter counts it and stores the value. More about the working of this circuit is discussed in subsequent sections.

Schematic of this circuit:

Source: Binary Counter, For more such circuits, visit our Electronics Circuits section.

LED Flasher Circuit using IC 555

One of the basic 555 timer circuits, that you would like to build while getting started. This circuit is a simple use of 555 in astable mode which generates a continuous output in the form of square wave via pin 3 which turns the LED on and off. 

Make a Simple Touch Switch Circuit using IC 555

Here is a simple touch switch circuit made using 555 timer IC as a monostable vibrator. We have added two touch pins in the circuit. When the circuit is connected properly, upon touching the "pins", it will glow the LED connected with the circuit. This LED will remain glowing till the trigger is present, and once the trigger is removed LED turns off. 

To make this circuit, find here the touch switch circuit diagram and a detailed explanation of the working of this circuit.

Dark Detector Circuit Diagram using LDR and 555 Timer IC

Dark detector is an application which detects the light in surrounding with the help of a light dependant resistor (LDR) or also known as photo resisotrs. In this project, a square wave generator is created using 555 timer IC based astable multivibrator, and a LDR is interfacing with it. When there is no light in surrounding, or in this case when room light is switched off, the resistance of LDR is increased which makes the LED glows which is connected with the output IC of circuit.

Check out the circuit diagram of dark detector and explanation at Circuit Digest.