It relies on the smoke that is produced in the event of a fire and passes between a bulb and an LDR, the amount of light falling on the LDR decreases. This type of circuit is called optical smoke detector. Do not use it as a home smoke detector it`s jus for....

This circuit is intended for alerting purposes after a certain time is elapsed. It is suitable for table games requiring a fixed time to answer a question, or to move a piece etc. In this view it is a modern substitute for the old sandglass. Useful also for....

Below shown circuit will be automatically switched ON and OFF during night and morning times respectively. In above circuit R1 can be used to adjust the sensitivity. And the working of the circuit is very simple. The LDR will have very low resistance during....

This circuit is intended for alerting purposes after a certain time is elapsed. It is suitable for table games requiring a fixed time to answer a question, or to move a piece etc. In this view it is a modern substitute for the old sandglass. Useful also for....

This article helps you to make a Light Sensitive Morning Alarm circuit. The morning light is sensed by an LDR (Light Dependent Resistor) or Photoresistor and it triggers the alarming section. The circuit generates a melodious tone when light falls on it.....

This circuit is a circuit diagram of the radio-controlled, usually in the toy car application children. Circuit diagram consists of 2 parts of the circuit sender and receiver circuits. To the circuit sending radio signals generated by the oscillator circuit....

The circuit uses two LDRs which are placed one after another (separated by a distance of say half a metre) so that they may separately sense a person going into the room or coming out of the room. Outputs of the two LDR sensors, after processing, are used in....

This is the circuit diagram of a light activated switch based on National Semiconductors comparator IC LM 311 and a LDR. The circuit is based on a voltage comparator circuit wired around IC 1. The non inverting in put of IC1 is given with a reference voltage....

The following circuit shows about CD4017 IC For Automatic Room Lights Sensor Circuit Diagram. Features: has only one light sensor, using two LDRs ....

A Simple Light activated switch This is the circuit diagram of a light activated switch based on National Semiconductors comparator IC LM 311 and a LDR. The circuit is based on a voltage comparator circuit wired around IC 1. The non inverting in put of IC1....

Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charged lead acid battery and a power inverter would be used to ensure a smoothly organized holiday where....

Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charged lead acid battery and a power inverter would be used to ensure a smoothly organized holiday where....

My vintage (62 year old) pole light has always been controlled by a timer ”a source of continual frustration due the requirement of readjustment for the ever-changing seasons. However, after knocking it over (I backed my car into it ), I decided it was time....

I hacked together a quick and dirty Arduino MIDI-to-DMX control for our robot band Science Fiction Children. It`s really simple! And here`s how I did it. I have two really cheap LED Par56 from Stairville (DMX controlled), a simple DMX-Dimmer pack and use....

This circuit is a toy to encourage young children to count. Power is turned on by switch S1, then S2 is closed. This makes nine LEDs flash slowly. S2 is then opened and the LEDs go out. Pressing pushbutton PB1 turns on a random number of LEDs - briefly -....

The circuit as shown act as a light detector. Under normal conditions the resistance of the LDR is high, keeping pin 2 low. When light falls onto the LDR the resistance drops to a couple hundred ohms and triggers pin 2 high which biases the base of Q1 via....

The following circuit shows about Simple Light Sensor Circuit Diagram. Features: Crocodile Technology for simulate circuits working, LDR is high ....

This circuit controls the switching of the street light or porch light and it will be automated. This circuit of automatic lamp controller using 7806 regulator ic can be used to automate street lights, tube lights or any other house electrical lightning....

A low cost high performance programmable home security system using few LDR`s as an input sensors. When above sensor(s) get triggered system may dial the user specified phone number (using build-in DTMF generator) and activate the high power audio alarm and....

The circuit diagram of an Automatic Street Light Controller Circuit is explained in this post....

This is a basic dark detector/sensor circuit diagram based on a Photo Resistor (LDR) and few numbers of parts....

This simple robot, which responds to light and avoids obstacles, can be built without using a microcontroller, programmer or PC. The only special` component in the circuit is a window discriminator (a fancy version of a window comparator). Resistors R1 and....

A light based sensor using an LDR (Light detecting resistor) and ofcourse an Op Amp. You can use this circuit to make line followers and other stuff. Here we go: Since we are using an op amp to compare we should first be clear about its functioning.....

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The solar orientation circuit uses a comparator with window control that maintains engine idle as long as the two LDR`s (photoresist) are subjected to the same illumination. In this case, half the voltage is applied to the noninverting input of A1 and A2`s....

A Light Dependent Resistor (aka LDR, photoconductor, photoresistor, or photocell) is a component used commonly in electronics which has a resistance which decreases as the intensity of the light hitting its surface increases and visa versa. A typical light....

This is a simple yet effective darkness activator. It uses an LDR to detect the light and when no light is present, it will sound an alarm from a cheap 8Ohm speaker. This circuit can be easily converted to a light detector by simply adding an inverting....

I n this circuit, the alarm will be switched on under the following four different conditions: 1. When light falls on LDR1 (at the entry to the premises). 2. When light falling on LDR2 is obstructed. 3. When door switches are opened or a wire is broken. 4.....

The LDR is a variable resistor whose resistance decreases with increase in light intensity. When the light falling on an LDR has normal intensity, its Resistance is large enough and the voltage across R is insufficient to trigger the SCR. However, when light....

Fires can occur for several reasons, for example, forgot to turn off equipment that could cause such as irons, fire alarm circuit with a temperature sensor may be one option in an effort to secure our homes from fire hazards. Actually there is also a fire....

When enough light falls on the LDR in this circuit, an alarm tone is played on the loudspeaker. This tutorial shows beginners in electronics how to build the circuit on breadboard step by step....

Circuit bellow shows about LM741 IC for Light Dark Sensor Circuit diagram. This circuit have a many features, among others: 1 Watt LED spotlight, advantageous and able in a advanced ambit of renewable activity projects from automated lighting to aegis....