The DHT11 Sensor Relay Module is a widely used combination of two essential components in the world of electronics and embedded systems： the DHT11 temperature and humidity sensor, and a relay module for controlling external devices. This module is highly useful in various applications such as home automation, environmental monitoring, and industrial control systems. In this article, we will dive into the functionality of both the DHT11 sensor and the relay module, and explore how they can be combined to create an effective temperature and humidity control system.

The DHT11 Sensor： Measuring Temperature and Humidity The DHT11 is a low-cost, digital temperature and humidity sensor that is popular among hobbyists and professionals alike for its simplicity and ease of integration with microcontrollers such as Arduino and Raspberry Pi. It measures both the relative humidity (RH) and temperature of the surrounding environment and communicates the data using a single-wire digital protocol. Key Features of the DHT11 Sensor： Temperature Range： The DHT11 can measure temperatures between 0°C and 50°C with a margin of error of ±2°C. Humidity Range： It can measure humidity between 20% and 90% with an accuracy of ±5% RH.