This article discusses the design and development of an IoT-based temperature monitoring system using a custom PCB.The project includes the integration of a DHT11 temperature and humidity sensor, an ESP8266 Wi-Fi module, and a custom PCB manufactured by PCBONLINE.The article outlines the circuit design and PCB layout process, along with the steps to generate Gerber files for manufacturing.The ESP8266 module sends temperature data to an IoT platform for real-time monitoring, and the code for the temperature monitoring system is provided.