GreenDetect is an open-source wireless sensor network platform designed for environmental monitoring in areas without internet connectivity. It supports up to 60 sensor nodes communicating via the ESP-NOW protocol to a central computer. The system includes an application for real-time monitoring, alarm detection, animated geographic mapping, and data logging. Hardware components encompass custom PCBs, Arduino-compatible firmware, and solar-powered modules. The project provides comprehensive documentation and design files to facilitate construction and deployment.