Light-dependent resistors are generally used in night lights. LDRs are used in photography light meters. Light-dependent resistors are mainly used in line following robots that used LDR to determine the change of course. Related Project: Automatic Night Lamp Using Arduino and LDR. The disc of the LDR is mounted in a glass envelope to prevent surface contamination. It takes around 10 ms for the resistance of LDR to drop completely and up to 1 second for the resistance to rise back to the previous value, after removal of the light.Ĭonstruction of light dependent resistor: To manufacture a cadmium sulfide LDR, highly purified cadmium sulfide powder and inert binding materials are used. It usually takes some time for the resistance to drop completely when light is applied after total darkness. This phenomenon is called resistance recovery rate. Latency: In LDRs, there is time latency between changes in illumination and changes in resistance. This is the reason LDRs are not suitable for precise light intensity measurement. Even if the sensitivity of the light is kept constant, the resistance of the device may still vary due to the change in temperature. Sensitivity: LDR has lower sensitivity than photoconductors and photodiodes. Extrinsic LDR are generally designed for longer wavelength of a light The sensitivity of a photoresistor varies with the light wavelength. Wavelength: LDR is not sensitive in a certain wavelength range. Related Project: Simple Touch Sensitive Switch Circuit using 555 Timer & BC547 Transistor. Based on the material, LDR is of two types namely intrinsic and extrinsic photoresistor. So, higher the intensity of light larger will be the voltage drop. However, the resistance of LDR is inversely proportional to the intensity of light. As soon as the LDR is exposed to light, the resistance drops largely depending on the intensity of light. If the intensity of light is very low (dark), the resistance of LDR is very high. LDRs is used to indicate the presence or absence of light. In our electronic eye circuit, we have used light dependent resistor (LDR) to detect the presence of light that falls on the circuit.īefore starting with the design process of electronic eye circuit, let us discuss the working and function of two main components of the circuit i.e. #ELECTRIC EYE TIMER MANUAL#
Since the device is capable of working automatically, this eliminates the need of manual switching of the device and hence saves the manpower.
Then according to the intensity of light this device turns ON the light when it becomes dark and vice versa.
Related Post: What is a Bionic Eye and How Does it Work?Įlectronic eye circuit uses a photodetector for detecting the presence of a light.
We have also described the features of main components used in the circuit to make you understand the working of electronic eye more clearly. This circuit can be used in devices to detect the presence of light automatically and operate the circuit accordingly. In this article, we will be discussing the “Electronic eye” circuit that is popularly known as magic eye. No doubt, electronic devices are saving a lot of manpower and un-necessary effort. In this era of electronics, we always come across several electronic devices and machines that are working superbly to ease our workflow to a great extent. Electronic Eye Circuit for Security Control System
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