Quick start: only four pins required to operate (VCC, GND, SDA, SCL). Two of those lines (SDA and SCL) provide standard I2C communication for easy integration with microcontrollers and development boards. Built‑in I2C pullups: the board includes 4.7 kΩ pullup resistors on the I2C lines so it works out of the box. If you connect multiple I2C devices on the same bus, the pullups can be disabled to avoid interfering with bus termination. Accurate environmental sensing: provides relative humidity readings and very accurate temperature measurements through the same twowire I2C interface. Drop‑in SHT20/SHT21 replacement: designed as a direct replacement for SHT20 and SHT21 sensors. It matches the original interface while improving durability against electromagnetic interference (EMI), making it more robust in electrically noisy environments. Key benefits — why this module solves problems Saves time and wiring effort: only four connections and built‑in pullups let you prototype or deploy quickly. Simplifies multisensor setups: easily share the I2C bus with other devices; disable onboard pullups when needed. Reliable readings in noisy environments: enhanced EMI resistance reduces measurement errors and improves stability in industrial or crowded RF environments. Straightforward upgrade path: compatible replacement for SHT20/SHT21 means no firmware or hardware redesign when swapping sensors. Important attributes Function: measures relative humidity and temperature, communicates over I2C. Compatibility: works with standard I2C hosts and is a direct replacement for SHT20/SHT21 sensors. Connectivity: four pins (VCC, GND, SDA, SCL); two data lines for I2C. Electronics: onboard 4.7 kΩ pullup resistors on SDA and SCL, with the option to disable if required. Performance: provides precise temperature readings and reliable humidity measurements; engineered to better withstand electromagnetic interference. Typical use scenarios Home and building automation: monitor indoor humidity and temperature for HVAC control, dehumidifiers, and airquality systems. IoT and data logging: integrate into microcontrollerbased projects and remote sensors that report environmental conditions over I2C. Greenhouse and agricultural monitoring: accurately track humidity and temperature to support plant health and automated climate control. Quick integration tips Connect VCC and GND, then SDA and SCL to your microcontroller's I2C pins. The module is ready to use with its onboard 4.7 kΩ pullups. If multiple I2C devices are present on the same bus, disable the module's pullups (if provided) to prevent parallel resistor conflicts. Use the same I2C addresses and commands as SHT20/SHT21 for seamless replacement. This module provides a compact, easy‑to‑connect way to add reliable humidity and precise temperature sensing to your projects while remaining compatible with existing SHT20/SHT21 implementations and offering improved EMI durability.