This article describes an information technology for green software engineering for IoT devices. For the using of proposed information technology, we should know only source assembler code of the program and the types of CPU and RAM. This technology consists of three steps: scanning of assembler code and determination types of each assembler instruction and their volume in bits; applying of the method for computer's estimating power consumption based on assembler source code and finally estimating of RAM energy consumption. Proposed information technology especially useful for development of software for the devices of Internet of Things.