DIY KIT 49- Dark sensor
This is yet another dark sensor DIY kit. It is slightly different from other dark sensor kits. It has a
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Tag: Dark sensor
DIY KIT 21- How to a make a photoresistor based dark sensor
I have written several posts similar to this one before. This experiment is again about a dark sensor based on
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Dark sensor on breadboard
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.
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An experiment with LDR and Arduino
It is a very simple experiment for Arduino amateurs, kids and beginners. It needs two LEDs, one LDR (Light Dependent
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Amarino project- Arduino and Android based light sensor
With this project/application, you can make a light sensor dependent lamp. You can make a light sensor or dark sensor
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Experiments with 741- Operational amplifier
Description: This versatile 741 operational amplifier module can be used for making a dark detector using an LDR, a photo
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Clap switch using 3 different modules
Description: In this clap switch we use three different modules given below. It is necessary to make these three modules
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Experiments with LM358
Description: LM358 is also one of the types of operational amplifier. LM358 consists of two independent, high-gain, frequency-compensated operational amplifiers designed
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Monostable module
Description: In the monostable mode, the 555 works as a “one-shot” pulse generator. Other applications of monostable mode include timers,
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Light activated police siren using 555 timer and light dependent resistor(LDR)
Here’s a simple light activated police siren using light dependent resistor and NE555 timer. Before you make this project, I
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Light dependent blinker using LDR and CD4093
Here’s a simple experiment with LDR and CD4093. This is just a modification of a previous project “dark sensor using
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Dark sensor using two transistors
This works same as the other dark detector circuit. When light is falling on LDR, its low resistance drives transistor
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Light operated switch
Light operated switch works with NE555 timer and light dependent resistor. It uses relay and toggle switch idea for operation.
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Remote Operated Switch
When you press an infrared transmitter or normal TV remote control near TSOP1738 infrared sensor, the 555 timer configured in monostable mode gets triggered.
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Basic RC circuit
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.
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FM transmitter and Dark sensor
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.
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Dark sensor using BC557
An automatic dark sensor can be made using a PNP transistor(BC557).
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AM receiver from dark sensor
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.
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Object counter using LDR and calculator
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
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.
