Food chain visibility and safety problems have caused huge loss of money and threat to public food safety. The blooming Wireless Sensor Network (WSN) technology has been highlighted as a promising solution to resolve these problems. Because nowadays food chains has become highly distributed, heterogeneous, cooperative, and globalized, a comprehensive system-picture is needed in design practices to meet the extremely diverse requirements. In this paper, a universal WSN platform is designed for food chain monitoring applications based on a scenario-based method. It classifies the complicated real food chains into five typical scenarios (
Produce, Store, Transport, Sell, and Consume
). All scenarios are supported by convergence of all the necessary technical requirements. And corresponding operation models, networking protocols, hardware, and software are implemented. Comparing to existing researches, this paper provides a more comprehensive system-picture and its technical feasibility is approved by practical implementation as well as field experiments.