One of the great problems of humanity is the excessive amount of waste generated worldwide; therefore, it is of vital importance not only to reduce it but also to transform it into new products. Approximately 50% of the waste generated in cities is organic, and this waste can be given an added value when transformed into compost. In this paper, the development of embedded software for a smart home composter is presented. The development process of the proposed software is guided by a specific method for embedded systems which combines the techniques of spiral development and prototyping; it consists of eleven stages and three iterations. This paper presents the results of the first iteration of the software development process used.