{"product_id":"kit-classroom-co2-monitor-plus-kit-with-arduino-uno-plus-sensor","title":"Classroom CO2 Monitor Plus Kit with Arduino Uno + Sensor","description":"\u003ch1\u003eClassroom CO2 Monitor Plus Kit — Build a Real-Time Ventilation Score with Arduino\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 4-5 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 Multi-Sensor Air Quality Monitoring \u0026amp; Composite Indexing\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eTransform how you think about indoor air. This kit puts a scientific tool in your hands — a portable, Arduino-powered monitor that reads CO₂, volatile gases, and comfort parameters to generate a single ventilation score. Designed specifically for school environments, it lets you prove when a classroom needs airflow, turning raw sensor numbers into actionable colour-coded advice on a crisp TFT screen.\u003c\/p\u003e\n\n\u003ch2\u003eWhat You'll Build\u003c\/h2\u003e\n\u003cp\u003eA battery-operated air quality station built on a breadboard. It continuously pulls data from an MH-Z19B NDIR CO₂ sensor, an MQ-135 for airborne contaminants, and a DHT22 for temperature and humidity. The Arduino Uno processes those three streams, computes a weighted ventilation index, and renders the results — CO₂ in ppm, gas level as a percentage, thermal comfort, plus a clear “open window” or “air safe” recommendation — on the 1.8″ TFT display. The whole unit runs off a 9 V battery, making it easy to carry from classroom to lab.\u003c\/p\u003e\n\n\u003ch2\u003eWhat You'll Learn\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eHow to communicate with an MH-Z19B over UART and retrieve calibrated CO₂ readings\u003c\/li\u003e\n  \u003cli\u003eHow to interface the MQ-135 analog gas sensor and apply linearization for real‑world use\u003c\/li\u003e\n  \u003cli\u003eHow to read the DHT22’s digital temperature\/humidity data using a one‑wire library\u003c\/li\u003e\n  \u003cli\u003eHow to drive a 1.8″ ST7735 TFT display and design a multi‑zone dashboard\u003c\/li\u003e\n  \u003cli\u003eHow to fuse three disparate sensor inputs into a single, intuitive ventilation score\u003c\/li\u003e\n  \u003cli\u003eHow to power a portable circuit from a 9 V battery and manage current budget\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\u003eMH-Z19B CO₂ sensor\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMQ-135 gas sensor\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDHT22 temperature\/humidity sensor\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e1.8in TFT ST7735 display\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e10kΩ resistors\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e100nF ceramic capacitors\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e400-point breadboard\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMale-to-male jumper wires\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e9V battery snap\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhy Buy This Kit Instead of Sourcing Parts Separately\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFactor\u003c\/th\u003e\n\u003cth\u003eSourcing Separately\u003c\/th\u003e\n\u003cth\u003eCompoden Kit\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompatibility checks\u003c\/td\u003e\n\u003ctd\u003eYou verify every part\u003c\/td\u003e\n\u003ctd\u003ePre-tested as a system\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBuild support\u003c\/td\u003e\n\u003ctd\u003eForums and scattered tutorials\u003c\/td\u003e\n\u003ctd\u003eAI companion trained on this exact project\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTime to first working build\u003c\/td\u003e\n\u003ctd\u003eDays of debugging\u003c\/td\u003e\n\u003ctd\u003eHours, with step-by-step guidance\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eShipping coordination\u003c\/td\u003e\n\u003ctd\u003eMultiple sellers, multiple delays\u003c\/td\u003e\n\u003ctd\u003eOne shipment from Bengaluru in 3-5 days\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWho This Kit Is For\u003c\/h2\u003e\n\u003cp\u003eIt fits CBSE Class 11–12 students taking up physics or computer science investigatory projects, B.Tech ECE\/EEE undergraduates building mini projects, ATL Tinkering Labs focusing on health‑tech themes, and Smart India Hackathon teams prototyping ventilation awareness tools. Whether you study at an IIT, NIT, VIT, BITS, or a local polytechnic, this kit delivers a real, measurable outcome you can showcase.\u003c\/p\u003e\n\n\u003ch2\u003eBuilt and Backed by Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eWhat if I get stuck during the build?\u003c\/summary\u003e\u003cp\u003eOpen the AI companion from the QR code — it explains every connection, code block, and calibration step. If you still have doubts, drop a WhatsApp message to our support team; they typically reply within a few hours.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan this monitor be used for a school science exhibition?\u003c\/summary\u003e\u003cp\u003eYes, it is designed for portable, battery‑powered demonstration. The TFT display shows live readings and a colour‑coded ventilation recommendation, making it a compelling exhibit for CBSE, ICSE, or state board science fairs.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes the kit include ready‑to‑upload Arduino code?\u003c\/summary\u003e\u003cp\u003eThe AI companion provides the full Arduino sketch, wiring diagram, and library instructions. You simply copy the code into the Arduino IDE and upload — no blank‑screen guesswork.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I log the air quality data over time?\u003c\/summary\u003e\u003cp\u003eThe core kit focuses on real‑time display, but the Arduino Uno’s USB port lets you send serial data to a computer for logging. With a small addition like an SD card module (not included), you can store hours of readings for later analysis.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003cdiv class=\"kit-description\"\u003e\n  \u003cp\u003eSchool Ventilation — MH-Z19B and MQ-135 and DHT22 give composite air quality score on TFT with recommendations.\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\u003eMH-Z19B CO2\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/mq-135-air-quality-gas-sensor-module-detects-ammonia-benzene-smoke\"\u003eMQ-135 Gas Sensor\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/dht22-temperature-humidity-sensor-module-accurate-readings\"\u003eDHT22\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/18-inch-spi-128x160-tft-lcd-display-module-for-arduino\"\u003e1.8in TFT ST7735\u003c\/a\u003e\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\n\u003ca href=\"\/products\/capacitor-variety-pack-6-values-100nf-to-470uf-30-pieces\"\u003e100nF Caps\u003c\/a\u003e x10\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 x25\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/9v-battery-snap-connector-with-15cm-wires-compoden\"\u003e9V Battery Snap\u003c\/a\u003e\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 Classroom CO2 Monitor Plus Kit with Arduino Uno + Sensor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The Classroom CO2 Monitor Plus Kit with Arduino Uno + Sensor includes all components needed: Arduino Uno R3, MH-Z19B CO2, MQ-135 Gas Sensor, DHT22, 1.8in TFT ST7735 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 Classroom CO2 Monitor Plus 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. School Ventilation — MH-Z19B and MQ-135 and DHT22 give composite air quality score on TFT with recommendations. Estimated build time is 4-5 hrs.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I buy the Classroom CO2 Monitor Plus Kit with Arduino Uno + Sensor online in India?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, the Classroom CO2 Monitor Plus 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\": \"Classroom CO2 Monitor Plus Kit with Arduino Uno + Sensor\",\n  \"description\": \"School Ventilation — MH-Z19B and MQ-135 and DHT22 give composite air quality score on TFT with recommendations.\",\n  \"sku\": \"CDN-KIT-3693\",\n  \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"url\": \"https:\/\/compoden.in\/products\/kit-classroom-co2-monitor-plus-kit-with-arduino-uno-plus-sensor\",\n    \"priceCurrency\": \"INR\",\n    \"price\": \"1675\",\n    \"availability\": \"https:\/\/schema.org\/InStock\",\n    \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\"}\n  },\n  \"category\": \"Smart Home \u0026 Living\"\n}\n\u003c\/script\u003e","brand":"Compoden","offers":[{"title":"Clone","offer_id":53463905927533,"sku":"CDN-KIT-3693-CL","price":2250.0,"currency_code":"INR","in_stock":true},{"title":"R3 Original","offer_id":53463905960301,"sku":"CDN-KIT-3693-R3","price":4530.0,"currency_code":"INR","in_stock":true},{"title":"R4 WiFi","offer_id":53463905993069,"sku":"CDN-KIT-3693-R4","price":3890.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/kit-classroom-co2-monitor-plus-kit-with-arduino-uno-plus-sensor.png?v=1781949501","url":"https:\/\/compoden.com\/products\/kit-classroom-co2-monitor-plus-kit-with-arduino-uno-plus-sensor","provider":"Compoden","version":"1.0","type":"link"}