Iot manhole monitor for manhole cover gas and temperature sensor

Urban drainage and sewer manholes often pose serious safety risks due to the accumulation of toxic gases and abnormal temperature rise, which can lead to explosions, health hazards, and infrastructure damage. This project presents an IoT-based Manhole Monitoring System designed to continuously monitor hazardous gas levels and temperature inside manholes in real time. The system employs gas sensors to detect harmful gases such as methane, hydrogen sulfide, and carbon monoxide, along with temperature sensors to identify overheating or fire risks. Sensor data is collected by a microcontroller and transmitted wirelessly to a cloud platform using IoT communication technologies. When abnormal conditions are detected, instant alerts are sent to authorities via a web or mobile application, enabling quick preventive action. The proposed system improves worker safety, enhances public safety, reduces manual inspection efforts, and supports smart city infrastructure by providing reliable, real-time monitoring of underground manhole conditions.