{"product_id":"kit-carbon-monoxide-home-alert","title":"Carbon Monoxide Home Alert Kit with Arduino Uno + Sensor","description":"\u003ch1\u003eDIY Carbon Monoxide Home Alert System with Arduino Uno, MQ-7 Sensor \u0026amp; GSM SMS Alerts\u003c\/h1\u003e\n\n\u003cp class=\"value-summary\"\u003eEvery part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.\u003c\/p\u003e\n\n\u003cdiv class=\"specs-strip\"\u003e\n  \u003cspan\u003e\u003cstrong\u003eDifficulty:\u003c\/strong\u003e Intermediate\u003c\/span\u003e\n  \u003cspan\u003e\u003cstrong\u003eBuild Time:\u003c\/strong\u003e 3-4 hrs\u003c\/span\u003e\n  \u003cspan\u003e\u003cstrong\u003eAge:\u003c\/strong\u003e 15-18\u003c\/span\u003e\n  \u003cspan\u003e\u003cstrong\u003eSkill:\u003c\/strong\u003e Embedded safety system with GSM alerts\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eCarbon monoxide (CO) is odourless, colourless, and lethal—especially in Indian kitchens using gas stoves, water heaters, or during winter with room heaters. This kit lets you build a real-time CO home alert system that not only sounds a loud local alarm but also activates an exhaust fan and sends an SMS warning to your phone when gas concentrations cross safe limits. Unlike cloud-dependent smart alarms, this Arduino-based solution works independently using a SIM800L GSM module, ensuring your family is alerted even without Wi-Fi.\u003c\/p\u003e\n\n\u003ch2\u003eWhat You'll Build\u003c\/h2\u003e\n\u003cp\u003eA stand-alone carbon monoxide safety device. The MQ-7 sensor continuously measures CO levels; the Arduino Uno reads the analog output, compares it to a calibrated threshold, and upon detection of a dangerous concentration, triggers three actions: the active buzzer sounds an audible alarm, the 5V relay switches on a connected exhaust fan (or any mains appliance) to ventilate the space, and the SIM800L GSM module sends a pre-configured SMS alert to a mobile number. The entire circuit runs on a single 12V DC power adapter via the LM2596 buck converter, making it deployable in a kitchen, boiler room, or garage.\u003c\/p\u003e\n\n\u003ch2\u003eWhat You'll Learn\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eInterpret analog output of the MQ-7 CO sensor and map it to ppm using the datasheet curves.\u003c\/li\u003e\n  \u003cli\u003eConfigure Arduino ADC to read gas concentration and implement calibration routines.\u003c\/li\u003e\n  \u003cli\u003eSend SMS messages using AT commands with the SIM800L GSM module.\u003c\/li\u003e\n  \u003cli\u003eDrive a 5V relay to safely control AC-powered appliances like exhaust fans.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKit Contents\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eComponent\u003c\/th\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMQ-7 CO Sensor\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSIM800L GSM\u003c\/td\u003e\u0026lt;\n\n\u003cdiv class=\"kit-description\"\u003e\n  \u003cp\u003eMQ-7 CO triggers alarm and relay exhaust fan. SMS via SIM800L on dangerous CO level.\u003c\/p\u003e\n  \u003ch4\u003eWhat's in this kit\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/uno-r3-ch340g-atmega328p-board-arduino-compatible\"\u003eArduino Uno R3\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/mq-7-carbon-monoxide-gas-sensor-module-compoden-india\"\u003eMQ-7 CO Sensor\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/ttgo-t-call-esp32-sim800l-module-for-iot-gsm-projects\"\u003eSIM800L GSM\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/4-channel-relay-board-for-esp32-30-pin-5v-control\"\u003e5V Relay Module\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/lm2596-buck-converter-step-down-voltage-regulator-module\"\u003eLM2596 Buck Converter\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/active-buzzer-dc-3-5v-85db-sounder-module-for-arduino-raspberry-pi\"\u003eActive Buzzer\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e1000µF 25V Caps x2\u003c\/li\u003e\n    \u003cli\u003e\n\u003ca href=\"\/products\/resistor-variety-pack-100-pcs-10-values-14w-carbon-film\"\u003e10kΩ Resistors\u003c\/a\u003e x5\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/breadboard-standard-bundle-830400-tie-points-for-prototyping\"\u003e400-pt Breadboard\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003eM-M Wires x20\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is included in the Carbon Monoxide Home Alert Kit with Arduino Uno + Sensor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The Carbon Monoxide Home Alert Kit with Arduino Uno + Sensor includes all components needed: Arduino Uno R3, MQ-7 CO Sensor, SIM800L GSM, 5V Relay Module, LM2596 Buck Converter and more. Everything is pre-tested for compatibility and shipped from Bengaluru, India.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What skill level is required for the Carbon Monoxide Home Alert Kit with Arduino Uno + Sensor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This kit is designed for Intermediate level makers, suitable for ages 15-18. MQ-7 CO triggers alarm and relay exhaust fan. SMS via SIM800L on dangerous CO level. Estimated build time is 3-4 hrs.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I buy the Carbon Monoxide Home Alert Kit with Arduino Uno + Sensor online in India?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, the Carbon Monoxide Home Alert Kit with Arduino Uno + Sensor is available online at Compoden (compoden.in), India's AI-powered electronics and robotics store. Ships from Bengaluru in 1-5 business days across India.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Carbon Monoxide Home Alert Kit with Arduino Uno + Sensor\",\n  \"description\": \"MQ-7 CO triggers alarm and relay exhaust fan. SMS via SIM800L on dangerous CO level.\",\n  \"sku\": \"CDN-KIT-1658\",\n  \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"url\": \"https:\/\/compoden.in\/products\/kit-carbon-monoxide-home-alert\",\n    \"priceCurrency\": \"INR\",\n    \"price\": \"3205\",\n    \"availability\": \"https:\/\/schema.org\/InStock\",\n    \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\"}\n  },\n  \"category\": \"Smart Home \u0026 Living\"\n}\n\u003c\/script\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Compoden","offers":[{"title":"Clone","offer_id":53469253206381,"sku":"CDN-KIT-1658-CL","price":3720.0,"currency_code":"INR","in_stock":true},{"title":"R3 Original","offer_id":53469253239149,"sku":"CDN-KIT-1658-R3","price":5990.0,"currency_code":"INR","in_stock":true},{"title":"R4 WiFi","offer_id":53469253271917,"sku":"CDN-KIT-1658-R4","price":5350.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/kit-carbon-monoxide-home-alert.png?v=1782286444","url":"https:\/\/compoden.com\/products\/kit-carbon-monoxide-home-alert","provider":"Compoden","version":"1.0","type":"link"}