Tag: Dark sensor

DIY KIT 49- Dark sensor

Posted on December 28, 2019April 24, 2020 by Sagar Sapkota

This is yet another dark sensor DIY kit. It is slightly different from other dark sensor kits. It has a

DIY KIT 21- How to a make a photoresistor based dark sensor

Posted on December 27, 2019April 24, 2020 by Sagar Sapkota

I have written several posts similar to this one before. This experiment is again about a dark sensor based on

Dark sensor on breadboard

Posted on September 8, 2018April 24, 2020 by Sagar Sapkota

The circuit is ready for testing. Connect battery terminals and see the output. As you block light falling on LDR(Light dependent resistor), the LED glows.

OUTPUT:

[youtube]http://www.youtube.com/watch?v=qmWAgoHwy3w[/youtube]

THIS CIRCUIT IS EXTREMELY SENSITIVE TO DARKNESS. EXPERIMENT THE CIRCUIT IN A HIGHLY ILLUMINATED ROOM.

LED GLOWS EVEN IN LESS DARKNESS. Use torch light if the LED glows in less darkness. You can adjust the sensitivity of the circuit using a variable resistor in place of R3-300Ohm. Try this circuit with other resistances as well, for example, 1K, 10K and 100K, etc.

An experiment with LDR and Arduino

Posted on June 18, 2012April 24, 2020 by Sagar Sapkota

It is a very simple experiment for Arduino amateurs, kids and beginners. It needs two LEDs, one LDR (Light Dependent

Amarino project- Arduino and Android based light sensor

Posted on May 28, 2012April 24, 2020 by Sagar Sapkota

With this project/application, you can make a light sensor dependent lamp. You can make a light sensor or dark sensor

Experiments with 741- Operational amplifier

Posted on May 15, 2012April 24, 2020 by Sagar Sapkota

Description: This versatile 741 operational amplifier module can be used for making a dark detector using an LDR, a photo

Clap switch using 3 different modules

Posted on May 9, 2012April 24, 2020 by Sagar Sapkota

Description: In this clap switch we use three different modules given below. It is necessary to make these three modules

Experiments with LM358

Posted on April 20, 2012April 24, 2020 by Sagar Sapkota

Description: LM358 is also one of the types of operational amplifier. LM358 consists of two independent, high-gain, frequency-compensated operational amplifiers designed

Monostable module

Posted on April 20, 2012April 24, 2020 by Sagar Sapkota

Description: In the monostable mode, the 555 works as a “one-shot” pulse generator. Other applications of monostable mode include timers,

Light activated police siren using 555 timer and light dependent resistor(LDR)

Posted on March 2, 2012April 24, 2020 by Sagar Sapkota

Here’s a simple light activated police siren using light dependent resistor and NE555 timer. Before you make this project, I

Light dependent blinker using LDR and CD4093

Posted on July 17, 2011April 24, 2020 by Sagar Sapkota

Here’s a simple experiment with LDR and CD4093. This is just a modification of a previous project “dark sensor using

Dark sensor using two transistors

Posted on January 8, 2011April 24, 2020 by Sagar Sapkota

This works same as the other dark detector circuit. When light is falling on LDR, its low resistance drives transistor

Light operated switch

Posted on December 18, 2010April 24, 2020 by Sagar Sapkota

Light operated switch works with NE555 timer and light dependent resistor. It uses relay and toggle switch idea for operation.

Remote Operated Switch

Posted on December 18, 2010April 24, 2020 by Sagar Sapkota

When you press an infrared transmitter or normal TV remote control near TSOP1738 infrared sensor, the 555 timer configured in monostable mode gets triggered.

Basic RC circuit

Posted on November 17, 2010April 24, 2020 by Sagar Sapkota

For the circuit to work as light operated musical bell, we need to connect the SW1- switch to N/C terminal of relay. LDR has to be kept in a dark case.

FM transmitter and Dark sensor

Posted on November 17, 2010September 14, 2020 by Sagar Sapkota

A dark sensor can be converted to a simple FM transmitter using the following components. This FM transmitter is very sensitive and it has transmitting range of 30 meters.

Dark sensor using BC557

Posted on November 17, 2010April 24, 2020 by Sagar Sapkota

An automatic dark sensor can be made using a PNP transistor(BC557).

AM receiver from dark sensor

Posted on November 17, 2010April 24, 2020 by Sagar Sapkota

In this case, LDR has been replaced with capacitor C1-0.01uF and resistor R3-1K has been replaced with L1 & VC1. In place of a LED, a Piezo Diaphragm has been kept.

We just need to add inductor, capacitor and a piezo diaphragm to convert a dark detector to an AM radio.

Object counter using LDR and calculator

Posted on November 14, 2010September 14, 2020 by Sagar Sapkota

To make an object counter we can use a simple dark detector circuit and a normal calculator. Pole and NO (Normally Open) terminals of a relay have to be connected to the two pins which are used to activate ‘=’ key of calculator.
As we block the light falling on LDR, the calculator starts counting.
For the calculator to work as a counter, we first need to press ‘1’ and ‘+’ keys.

Multivibrator

Posted on November 12, 2010April 24, 2020 by Sagar Sapkota

A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as light
emitting diodes, timers and flip-flops.