Aqara’s cord-free presence sensor runs for up to three years on battery power

The $50 sensor runs on two coin cell batteries so you don’t need a nearby power source for installation.
GitHub

Deneyap Temperature&Humidity, Barometer Sensor SHT4X Arduino Library

This Arduino library allows you to use Deneyap Temperature&Humidity, Barometer SHT4X with I2C peripheral. You can use this library in your projects with any Arduino compatible board with I2C ...
IEEE

Temperature Display on Web Browser Using Ethernet Shield And LM35 Sensor based on Arduino Board

Abstract: This work presents temperature display on web browser using Ethernet Shield And LM 35 Sensor based on Arduino IDE Environment. The web page programming was realized with Arduino Mega 2560 ...
C&EN

Highly Sensitive Flexible Humidity Sensor Based on Bacterial Cellulose/MXene/Graphene Oxide Composite Film

School of Interdisciplinary Science, Beijing Institute of Technology, Beijing 100081, China State Key Laboratory of Chips and Systems for Advanced Light Field Display, Center for Interdisciplinary ...
IEEE

High-Sensitivity and Temperature-Compensated Fiber-Optic Humidity Sensor Based on Agarose-Coated Fabry-Perot Microsphere

Abstract: A Fabry-Perot fiber sensor using agarose-coated microspheres achieves 3.109 nm/%RH (30-55% RH) and 2.029 nm/%RH (55-80% RH) sensitivity. Fusion splicing and dip-coating enable simple, ...