In the meantime, you can refer to the FAQ page of our official website or ask for assistance via “Feedback” via the SwitchBot App. Please read the Manual first before you set up and use your product. Malfunction or Serious Product Quality Issues. ![]() If in the unlikely event your order is missing, incorrect, or damaged, please contact us immediately.Ģ. We always do our best to deliver your order in an efficient manner and strive to make sure your orders are complete and undamaged. Please inspect your order as soon as you receive it. Geetali Saha, Department of Electronics and Communication, GCET, Gujarat, India.Items directly purchased from be returned in 30-days for a full refund or exchanged under the following circumstances: Project executed by Asmita Mukhopadhyay with Prof. If you want to read more projects based on LDRs can go through this article. ![]() This article is a part of the Top 10 LDR-based Electronics Projects. T = 0.69 x R x C Schematic: (made using Fritzing software) Automatic Curtain System Schematic Actual Photos of the Prototype: Automatic Curtain System Schematic Prototype Automatic Curtain System Schematic Prototype second image Thus, the time delay can be determined using the following formula: The time delay for each of the cases can be set by using different values of resistor and capacitor in the timer circuit.Motor runs for the time period determined by the delay provided in each of the cases and the curtain moves accordingly.Output of the respective timers reaches the motor via 2 channel relay module.Light sensing LDR circuit is inactive when exposed to darkness and vice-versa.The output of the respective LDRs are connected with two timer ICs set with time delays sufficient to fold and unfold the curtain.Deploying two separate circuits, one for sensing the light and the other for the darkness, ensures the proper reversal of rotation of the motor in one of the cases. One senses the darkness and other one is for light sensing. Two separate LDR circuits are used here.A DC motor converts DC electrical energy into mechanical energy.īlock diagram Block Diagram for Automatic Curtain System Working An electric motor operated by DC (direct current) is known as a DC Motor. The DC motor or direct current motor works on that principle. ![]() When a magnetic field and an electric field interact, a mechanical force is produced. The basic 555 timer gets its name from the fact that there are three internally connected 5kΩ resistors which it uses to generate the two comparators reference voltages. The 555 timer IC is a precision timing device which can act as either a simple timer to generate single pulses or long time delays, or as a relaxation oscillator producing a string of stabilized waveforms of varying duty cycles from 50 to 100%. The value of the resistance falls as the level of light increases. Values of the resistance of the LDR ranges over many orders of magnitude. The resistance changes with the intensity of light incident on it. Component NameĪn LDR is a light sensitive electronic component. It is an automatic process and the light intensity is sensed by LDR in the circuit. It does the task of folding and unfolding of the curtain as per the light intensity outside the window. Considering some of the factors such as time consumption, affordability, feasibility and convenience, automation has enhanced our standards of living in numerous ways.Ībiding by this notion, we are presenting an Automatic curtain opener model using LDR. ![]() We have witnessed a rapid inclination towards automation lately. Comment errors or corrections found for this circuit, and get the chance to win big!
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