This is yet another dark sensor DIY kit. It is slightly different from other dark sensor kits. It has aContinue reading
I have written several posts similar to this one before. This experiment is again about a dark sensor based onContinue reading
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.
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.Continue reading
It is a very simple experiment for Arduino amateurs, kids and beginners. It needs two LEDs, one LDR (Light DependentContinue reading
With this project/application, you can make a light sensor dependent lamp. You can make a light sensor or dark sensorContinue reading
Description: This versatile 741 operational amplifier module can be used for making a dark detector using an LDR, a photoContinue reading
Description: In this clap switch we use three different modules given below. It is necessary to make these three modulesContinue reading
Description: LM358 is also one of the types of operational amplifier. LM358 consists of two independent, high-gain, frequency-compensated operational amplifiers designedContinue reading
Description: In the monostable mode, the 555 works as a “one-shot” pulse generator. Other applications of monostable mode include timers,Continue reading
Here’s a simple light activated police siren using light dependent resistor and NE555 timer. Before you make this project, IContinue reading
Here’s a simple experiment with LDR and CD4093. This is just a modification of a previous project “dark sensor usingContinue reading
This works same as the other dark detector circuit. When light is falling on LDR, its low resistance drives transistorContinue reading
Light operated switch works with NE555 timer and light dependent resistor. It uses relay and toggle switch idea for operation.Continue reading
When you press an infrared transmitter or normal TV remote control near TSOP1738 infrared sensor, the 555 timer configured in monostable mode gets triggered.Continue reading
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.Continue reading
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.Continue reading
An automatic dark sensor can be made using a PNP transistor(BC557).Continue reading
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.Continue reading
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.
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.