{"product_id":"ens160-aht21-co2-tvoc-air-quality-temp-humidity-sensor-arduino","title":"ENS160 AHT21 CO2 TVOC Air Quality Temp Humidity Sensor Arduino","description":"\u003ch2\u003eENS160 + AHT21 Air Quality, CO2, TVOC, Temperature \u0026amp; Humidity Sensor Module\u003c\/h2\u003e\n\u003cp\u003eUpgrade your Arduino or microcontroller project with this powerful \u003cstrong\u003eENS160 + AHT21 combo sensor module\u003c\/strong\u003e. Designed as a modern drop-in replacement for the CCS811, this board simultaneously measures \u003cstrong\u003eequivalent CO₂ (eCO₂)\u003c\/strong\u003e, \u003cstrong\u003eTotal Volatile Organic Compounds (TVOC)\u003c\/strong\u003e, \u003cstrong\u003eambient temperature\u003c\/strong\u003e, and \u003cstrong\u003erelative humidity\u003c\/strong\u003e — all from a single compact board over a standard I²C interface.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're building a smart home air quality monitor, an HVAC automation system, or a classroom environmental logger, this sensor gives you the real-time data you need to make informed decisions about indoor air conditions.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eENS160 Gas Sensor:\u003c\/strong\u003e Accurately measures eCO₂ (400–65,000 ppm) and TVOC (0–65,000 ppb) using a multi-pixel metal-oxide (MOX) sensing element\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAHT21 Humidity \u0026amp; Temperature Sensor:\u003c\/strong\u003e High-precision readings for relative humidity (0–100% RH) and temperature (-40°C to +85°C)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCCS811 Replacement:\u003c\/strong\u003e Fully compatible drop-in upgrade — same I²C interface, improved accuracy and faster response\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eArduino \u0026amp; Raspberry Pi Ready:\u003c\/strong\u003e Breadboard-friendly breakout with clearly labeled pins (VCC, GND, SDA, SCL, INT, ADDR)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3.3V \/ 5V Compatible:\u003c\/strong\u003e Onboard voltage regulator and level shifter for hassle-free integration\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e Lightweight PCB module, ideal for embedded and wearable projects\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePolymer Construction:\u003c\/strong\u003e Durable housing material for reliable long-term use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensors\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eENS160 (eCO₂, TVOC) + AHT21 (Temp, Humidity)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eI²C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eeCO₂ Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e400 – 65,000 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTVOC Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0 – 65,000 ppb\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTemperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40°C to +85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHumidity Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0 – 100% RH\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.3V \/ 5V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDigital (I²C)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolymer PCB\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eThis module is perfect for:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eArduino, ESP32, ESP8266, and Raspberry Pi makers\u003c\/li\u003e\n  \u003cli\u003eSmart home and IoT developers building indoor air quality monitors\u003c\/li\u003e\n  \u003cli\u003eHVAC and ventilation control systems\u003c\/li\u003e\n  \u003cli\u003eSchool science projects and environmental data logging\u003c\/li\u003e\n  \u003cli\u003eAnyone upgrading from a CCS811 module who wants improved sensor performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/360-bicycle-chain-cleaner-tool-gear-cleaning-kit\"\u003e360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Is the ENS160 + AHT21 sensor module a direct replacement for the CCS811?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The ENS160 + AHT21 module is designed as a compatible upgrade to the CCS811. It uses the same I²C communication protocol, making it straightforward to swap into existing Arduino or microcontroller projects. The ENS160 chip offers improved eCO₂ and TVOC sensing accuracy compared to the CCS811.\u003c\/p\u003e\n\u003ch4\u003eQ: What microcontrollers are compatible with this sensor?\u003c\/h4\u003e\n\u003cp\u003eA: This module works with any microcontroller that supports I²C communication, including Arduino Uno, Arduino Mega, Arduino Nano, ESP32, ESP8266, STM32, and Raspberry Pi. It supports both 3.3V and 5V logic levels thanks to the onboard level shifter.\u003c\/p\u003e\n\u003ch4\u003eQ: Does this module measure actual CO₂ or equivalent CO₂ (eCO₂)?\u003c\/h4\u003e\n\u003cp\u003eA: The ENS160 sensor measures \u003cstrong\u003eequivalent CO₂ (eCO₂)\u003c\/strong\u003e, which is an estimated CO₂ concentration derived from detected volatile organic compounds. This is a cost-effective alternative to NDIR-based direct CO₂ measurement and is well-suited for indoor air quality monitoring applications.\u003c\/p\u003e\n\u003ch4\u003eQ: What library should I use to program this sensor with Arduino?\u003c\/h4\u003e\n\u003cp\u003eA: Several open-source Arduino libraries support the ENS160 and AHT21 sensors. You can use the ScioSense ENS160 library combined with an AHT21\/AHTxx library, both available in the Arduino Library Manager. Many community examples are also available on GitHub for quick project setup.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is the ENS160 + AHT21 sensor module a direct replacement for the CCS811?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The ENS160 + AHT21 module is designed as a compatible upgrade to the CCS811. 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