{"title":"Electronics DIY Bestsellers","description":"","products":[{"product_id":"energy-monitoring-and-control-system","title":"Energy Monitoring and Control System","description":"The \u003cstrong\u003eenergy meter\u003c\/strong\u003e is an electrical measuring device, which is used to record Electrical Energy Consumed over a specified period of time in terms of units. Here we have an energy meter using the current sensing concept. This energy meter is prepaid that is recharged and used. The recharge can be done by sending a simple SMS from your mobile phone. There \u003cstrong\u003eEnergy Monitoring and Control System\u003c\/strong\u003e is a recharge tag to be sent by the mobile which will act as the recharge code as a prototype.\u003cbr\u003e\u003cbr\u003eThe \u003cstrong\u003eEnergy Monitoring and Control System\u003c\/strong\u003e will check for consumption on the basis of load and the recharge available. The power will be available till the recharge amount does not end. There is a feature that if there is any interruption with the meter an SMS will be sent to the user for control.\u003cbr\u003e\u003cbr\u003e The \u003cstrong\u003eEnergy Monitoring and Control System Project\u003c\/strong\u003e basically depends upon the energy units we use. In this project, the power supply is cut-off after a particular unit. The operator sitting at a remote station can recharge the system using SMS. Here the microcontroller keeps on sensing the load also. As the load increases, it will turn off the relay, and hence the power will be cut. As soon as the load gets decreased, the controller can turn on the relay also. If there is any type of violation in the meter an SMS will be sent to the registered user. \u003cbr\u003e\u003cbr\u003e\n\u003cdiv class=\"product_info\" style=\"text-align: start;\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eBlock Diagram\u003c\/h3\u003e\n\u003cp\u003e\u003cimg height=\"75%\" width=\"85%\" style=\"float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/files\/LGEC120.jpg?v=1637045623\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003ePhysical Attributes\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cul class=\"pro-ds\"\u003e\n\u003cli\u003eDimensions (cm) L x W x H : 28 x 24 x 8\u003c\/li\u003e\n\u003cli\u003eWeight (gm): 1000\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eProduct Video\u003c\/h3\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe data-sanitized-allowfullscreen=\"\" data-sanitized-allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" data-sanitized-frameborder=\"0\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/xHG5C-B0kFg\" height=\"400\" width=\"800\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cbr\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe data-sanitized-allowfullscreen=\"\" data-sanitized-allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" data-sanitized-frameborder=\"0\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/6rmErwU5E-k\" height=\"400\" width=\"800\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cbr\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe data-sanitized-allowfullscreen=\"\" data-sanitized-allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" data-sanitized-frameborder=\"0\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/Fp37DPZVdRI\" height=\"400\" width=\"800\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"KitsGuru","offers":[{"title":"DO IT YOURSELF","offer_id":40708811391157,"sku":"LGEC120","price":2999.0,"currency_code":"INR","in_stock":true},{"title":"READY TO USE","offer_id":40708811358389,"sku":"LGEC120_R","price":3899.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/products\/products-LGEC120-Energy-Monitoring-and-Control-System.jpg?v=1628432926"},{"product_id":"over-voltage-and-frequency-protection","title":"Detecting Power Grid Synchronization Failure on Sensing Frequency or Voltage Beyond  Acceptable Range","description":"\u003cstrong\u003eAutomation in monitoring\u003c\/strong\u003e is a very important part of industrial plants. This system can be used to automate the electrical system where the system is sensitive to voltage and change in frequency. It also serves for safety in heavy industrial duty. Automation of cut-off increases the reliability of the system. An \u003cstrong\u003eover-voltage and over-frequency detection\u003c\/strong\u003e algorithm is developed using this kit's microcontroller. The system is based on a microcontroller from the Atmel AVR family.\u003cbr\u003e\u003cbr\u003eThe\u003cstrong\u003e microcontroller monitors\u003c\/strong\u003e the overvoltage derived from a set of resistors and controller inbuilt ADC and over frequency from by the interrupt program using LCD for the utility grid and the processed value of voltage and frequency for turning ON\/OFF the relay between a grid-connected inverter and the utility grid. The microcontroller used in the project is of the AVR family which is 8 bit.\u003cbr\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eOver Voltage and Frequency Protection kit is more durable.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThis system is based on a microcontroller from the Atmel AVR family.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe microcontroller used in the project is of the AVR family which is 8 bit.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003ePhysical Attributes\u003cbr\u003e\n\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cul class=\"pro-ds\"\u003e\n\u003cli\u003eDimensions (cm) L x W x H : 28 x 24 x 8\u003c\/li\u003e\n\u003cli\u003eWeight (gm): 1000\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eProduct Video\u003c\/h3\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe data-sanitized-allowfullscreen=\"\" data-sanitized-allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" data-sanitized-frameborder=\"0\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/6rmErwU5E-k\" height=\"400\" width=\"800\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe data-sanitized-allowfullscreen=\"\" data-sanitized-allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" data-sanitized-frameborder=\"0\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/Fp37DPZVdRI\" height=\"400\" width=\"800\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"KitsGuru","offers":[{"title":"DO IT YOURSELF","offer_id":40708820041909,"sku":"LGEE008","price":2299.0,"currency_code":"INR","in_stock":true},{"title":"READY TO USE","offer_id":40708819976373,"sku":"LGEE998_R","price":2999.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/products\/OverVoltageAndFrequencyProtection.jpg?v=1634644151"},{"product_id":"gas-leakage-detection-alarm","title":"Gas Leakage Detection Alarm — LPG \u0026amp; CNG Detector with MQ6 Sensor","description":"We provide you with the best \u003cstrong\u003eGas Leakage Detection Alarm Kit\u003c\/strong\u003e to detect gas leakages. This kit is equipped with an MQ6 gas sensor, which will alert you if it detects a leak. This sensor can detect many gases according to its sensitivity, which is calibrated using resistance pairs. (2.2K \u0026amp;1K in this case for LPG and CNG gas detection).\u003cbr\u003e\u003cbr\u003e The working principle of this \u003cstrong\u003eGas Leakage Alarm Sensor\u003c\/strong\u003e is that it converts the heat generated by the combustion of this gas into voltage. Depending on the amount of gas present, this sensor gives an analog variation of the voltage on its data pin. This is done through op-amp used in comparator where we compare the analog voltage with a reference voltage calibrated through a 10K preset. If the Vip\u0026gt;Vref output is high else the output is low (high specify gas leakage and low no leakage). \u003cbr\u003e\u003cbr\u003eThe op-amp IC used is LM324 (quad op-amp IC) and the mode of its operation is non-inverting. The digital data from the op-amp IC is interfaced with the output device. Red led is glowing when gas is leakage and the buzzer will be a beep. If there is no \u003cstrong\u003eLeakage Of Gas\u003c\/strong\u003e then the output will be low otherwise high.\n\u003cdiv class=\"product_info\"\u003e\n\u003cbr\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eBlock Diagram\u003c\/h3\u003e\n\u003cdiv id=\"p_info\" style=\"text-align: start;\"\u003e\u003cimg style=\"float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/files\/Gas-Leakage-Detection-Alarm-Block-Diagram.jpg?v=1632568710\" alt=\"lpg-gas-leakage-detector-alarm-block-diagram\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003ePhysical Attributes\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cul class=\"pro-ds\"\u003e\n\u003cli\u003eDimensions (cm) L x W x H : 20 x 15 x 5\u003c\/li\u003e\n\u003cli\u003eWeight (gm): 200\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eProduct Video\u003c\/h3\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe height=\"400\" width=\"800\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/mcT4NvGpg-A\" frameborder=\"0\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe height=\"400\" width=\"800\" src=\"https:\/\/www.youtube.com\/embed\/6rmErwU5E-k\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe height=\"400\" width=\"800\" src=\"https:\/\/www.youtube.com\/embed\/Fp37DPZVdRI\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"KitsGuru","offers":[{"title":"DO IT YOURSELF KIT","offer_id":40708843897013,"sku":"LGKT012","price":699.0,"currency_code":"INR","in_stock":true},{"title":"READY TO USE KIT","offer_id":40708843864245,"sku":"LGKT012_R","price":999.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/products\/lpg-gas-leakage-detector-using-arduino.jpg?v=1632570647"},{"product_id":"electronic-metal-detector-diy-kit","title":"Electronic Metal Detector DIY Kit","description":"An old pocket radio and a single transistor circuit is used to build this low-cost metal detector. This \u003cstrong\u003eElectronic Metal Detector DIY Kit\u003c\/strong\u003e is nothing but a Colpitts oscillator working in the medium band frequency and a radio tuned to the same frequency. First, the radio and the circuit are placed close. Then the radio is turned OFF so that there is no sound from the radio. In this condition, the radio and the circuit will be in the same frequency and the same frequencies beat off to produce no sound.\u003cbr\u003e\u003cbr\u003e When the \u003cstrong\u003emetal detector circuit\u003c\/strong\u003e is placed near a metal object the inductance of its coil changes, and so does the frequency of oscillations. Now the two frequencies will be different, there will be no cancelling, and the radio produces a hissing sound. Hence, the metal is detected.\u003cbr\u003e\u003cbr\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003ePhysical Attributes\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cul class=\"pro-ds\"\u003e\n\u003cli\u003eDimensions (cm) L x W x H : 20 x 15 x 5\u003c\/li\u003e\n\u003cli\u003eWeight (gm): 200\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eProduct Video\u003c\/h3\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe width=\"800\" height=\"400\" src=\"https:\/\/www.youtube.com\/embed\/roZV774yE4w\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe width=\"800\" height=\"400\" src=\"https:\/\/www.youtube.com\/embed\/6rmErwU5E-k\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe width=\"800\" height=\"400\" src=\"https:\/\/www.youtube.com\/embed\/Fp37DPZVdRI\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"KitsGuru","offers":[{"title":"DO IT YOURSELF KIT","offer_id":40708884988085,"sku":"LGKT082","price":449.0,"currency_code":"INR","in_stock":true},{"title":"READY TO USE KIT","offer_id":40708884955317,"sku":"LGKT082_R","price":649.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/products\/Electronic-Metal-Detector-DIY-Kit.jpg?v=1633069729"},{"product_id":"and-logic-implementation-using-diodes","title":"AND Logic Implementation Using Diodes","description":"A logic gate is an elementary \u003cstrong\u003ebuilding block of a digital circuit\u003c\/strong\u003e. Most logic gates have two inputs and one output. At any given moment, every terminal is in one of the two binary conditions low (0) or high (1), represented by different voltage levels. There are various types of logic are available like AND logic, OR logic, etc. Here we have implemented two inputs one output \u003cstrong\u003eAND logic.\u003c\/strong\u003e In this logic, the output is high only when both inputs are high, otherwise, the output remains low.\u003cbr\u003e\u003cbr\u003eThe \u003cstrong\u003eLogic Implementation Using Diodes Circuit\u003c\/strong\u003e is easy to understand. Two diodes are used here. We know that the turn conducts only when the anode is at a lower voltage than the cathode. If one of the switches is on, then the diode corresponding to that switch conducts, and the voltage at v2 remains low. If both switches are off (open) then only the voltage at v2 goes too high and the LED gets to turn on.\u003cbr\u003e\u003cbr\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003ePhysical Attributes\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cul class=\"pro-ds\"\u003e\n\u003cli\u003eDimensions (cm) L x W x H : 20 x 15 x 5\u003c\/li\u003e\n\u003cli\u003eWeight (gm): 200\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eProduct Video\u003c\/h3\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/vEiaXOGYHVk\" height=\"400\" width=\"800\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe width=\"800\" height=\"400\" src=\"https:\/\/www.youtube.com\/embed\/ksfNm8ypTxs\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"KitsGuru","offers":[{"title":"DO IT YOURSELF","offer_id":40708893442229,"sku":"LGSK009","price":129.0,"currency_code":"INR","in_stock":true},{"title":"READY TO USE","offer_id":40708893474997,"sku":"LGSK009_R","price":249.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/products\/implementation-of-logic-gate-using-diodes.jpg?v=1634628107"},{"product_id":"auto-power-supply-control-4-different-sources","title":"Auto power supply control 4 different sources","description":"\u003cstrong\u003eAuto supply 4 different switching\u003c\/strong\u003e is basically the selection of supply from multiple available power sources automatically by using the microcontroller concept that is to check the availability of the source and switching to that available source to ensure uninterrupted power supply to load. In the case of the electrical appliance control using automation causes more safety.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eAuto supply switching kit\u003c\/strong\u003e is a prototype for the same which is an auto change to another source when the main supply fails without human interaction in this system we are designing an embedded circuit to control and ensure auto supply switching. In case all 4 phases are available, then the switching will be in the default phase. Four relays are there to control the switching. As it is not feasible to provide all 4 different sources of supply, one source with alternate switches is provided to get the same function.\u003cbr\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cli\u003eIn this project, we are having 4 switches which we consider as 4 different sources of supply.\u003c\/li\u003e\n\u003cli\u003eWhen we press any of the switches it shows the absence of that particular source that is connected to the microcontroller as input signals.\u003c\/li\u003e\n\u003cli\u003eThe output of the microcontroller is given to the ULN2803 which acts as a relay driver. The current phase working is displayed on LCD also.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003ePhysical Attributes\u003cbr\u003e\n\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cul class=\"pro-ds\"\u003e\n\u003cli\u003eDimensions (cm) L x W x H : 28 x 24 x 8\u003c\/li\u003e\n\u003cli\u003eWeight (gm): 1000\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eProduct Video\u003c\/h3\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/KKQTAUKbxpY\" height=\"400\" width=\"800\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/6rmErwU5E-k\" height=\"400\" width=\"800\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/Fp37DPZVdRI\" height=\"400\" width=\"800\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"KitsGuru","offers":[{"title":"DO IT YOURSELF","offer_id":40708920049845,"sku":"LGEE001A","price":3599.0,"currency_code":"INR","in_stock":true},{"title":"READY TO USE","offer_id":40708920017077,"sku":"LGEE001A_R","price":4299.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/products\/Autopowersupplycontrol4differentsources.jpg?v=1634547043"},{"product_id":"electric-fire-alarm","title":"Electric Fire Alarm","description":"\u003cp\u003eA \u003cstrong\u003efire alarm is an electronic sounder\u003c\/strong\u003e or a bell. The sounder makes a loud high pitched sound to alert people that there is a fire in the building. Here the fire alarm devices sense the heat and activate the loud noise. There are many typical and complex fire alarm circuits available in the form of standalone devices. But this is a simple fire alarm circuit using LM358. This is a simple project which detects the fire and triggers the siren sound or a buzzer.\u003cbr\u003e\u003cbr\u003e This \u003cstrong\u003eElectric Fire Alarm Circuit\u003c\/strong\u003e is based on IR(infra-red) sensors. Fire has a lot of IR rays. In the given circuit IR sensor and R2 works as resistance divider networks. As the infrared rays fall on the sensor its resistance decreases and the value of R2 is fixed. This causes the voltage at pin 3 of the operational amplifier to increase. (on its non-inverting terminal). If the voltage set at pin2 of the operational amplifier (LM358) becomes less than the voltage of pin 3 then the output of the op-amp(operational amplifier) becomes high.\u003c\/p\u003e\n\u003cp\u003eThis\u003cstrong\u003e Electric Fire Alarm \u003cspan data-mce-fragment=\"1\" mce-data-marked=\"1\"\u003eKit\u003c\/span\u003e \u003c\/strong\u003eis the fundamental principle of operation of any operational amplifier ie if the voltage of the non-inverting amplifier becomes higher than the voltage of the inverting amplifier the output becomes high. The led D1 is used here for indication purposes only. The resistance R1 is used to protect the LED from overcurrent damage. The buzzer is an active buzzer(BZ1), whenever its pin1 goes high, it starts beeping.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eSchematic Diagram\u003c\/h3\u003e\n\u003cdiv id=\"p_info\" style=\"text-align: center;\"\u003e\u003cimg height=\"480x480\" width=\"480x480\" style=\"float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/files\/fire-alarm-circuit-diagram_480x480.jpg?v=1634539965\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003ePhysical Attributes\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cul class=\"pro-ds\"\u003e\n\u003cli\u003eDimensions (cm) L x W x H : 15 x 12 x 5\u003c\/li\u003e\n\u003cli\u003eWeight (gm): 50\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eProduct Video\u003c\/h3\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe width=\"800\" height=\"400\" src=\"https:\/\/www.youtube.com\/embed\/XeItj7-sedw\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/Ova8HD60UCE\" height=\"400\" width=\"800\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe width=\"800\" height=\"400\" src=\"https:\/\/www.youtube.com\/embed\/Pjsoq-ZejRM\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"KitsGuru","offers":[{"title":"DO IT YOURSELF","offer_id":40708939808949,"sku":"LGZK001","price":129.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/products\/fire-alarm-project-using-arduino.jpg?v=1634376013"},{"product_id":"security-system-using-ldr","title":"Security System Using LDR","description":"This\u003cstrong\u003e Security System Using LDR Circuit\u003c\/strong\u003e is based on the operational amplifier IC 741, which is acting here as a comparator. As the light falls on the LDR R3, its resistance decreases, and the voltage at the V+ terminal of the opamp increases, as soon as it becomes more than V- set by the potentiometer R5, the output becomes high. Consequently, the buzzer and LED get turned on.\u003cbr\u003e \u003cbr\u003eThis prototype model can be placed at dark places where the entry of any person is prohibited. This \u003cstrong\u003eElectronic\u003c\/strong\u003e \u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003eSecurity System Using LDR Circuit\u003c\/strong\u003e is made of high-quality material. This is the product for you if you enjoy being scared every day of your life. \u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eCircuit Diagram\u003c\/h3\u003e\n\u003cdiv id=\"p_info\" style=\"text-align: center;\"\u003e\u003cimg alt=\"Security-System-block-diagram\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/files\/Security-System-Using-LDR.jpg?v=1633673595\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003ePhysical Attributes\u003c\/h3\u003e\n\u003cdiv id=\"p_info\"\u003e\n\u003cul class=\"pro-ds\"\u003e\n\u003cli\u003eDimensions (cm) L x W x H : 15 x 12 x 5\u003c\/li\u003e\n\u003cli\u003eWeight (gm): 50\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003cdiv class=\"product_info\"\u003e\n\u003ch3 class=\"sing--sub-heading\"\u003eProduct Video\u003c\/h3\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/HhOufS_4rBk\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cbr\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe width=\"800\" height=\"400\" src=\"https:\/\/www.youtube.com\/embed\/wMqj6D6YZB4\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cbr\u003e\n\u003cdiv id=\"p_video\"\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/W6mixXsn-Vc\" height=\"400\" width=\"800\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"KitsGuru","offers":[{"title":"DO IT YOURSELF KIT","offer_id":40708940660917,"sku":"LGBK010","price":199.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/products\/security-system-project.jpg?v=1633673704"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/2130\/4757\/collections\/gas-leakage-detector-project.jpg?v=1736592905","url":"https:\/\/kitsguru.com\/es\/collections\/electronics-diy-bestsellers.oembed","provider":"KitsGuru","version":"1.0","type":"link"}