Contributed to the esphome/esphome repository by expanding unit support within the configuration management system, specifically adding a millivolts constant to the core constants file. This enhancement allows users and maintainers to specify and report millivolt values directly in ESPHome configurations, improving the flexibility and accuracy of embedded systems monitoring. The work was implemented in Python, leveraging skills in configuration management and embedded systems to ensure seamless integration with existing unit handling. Although the contribution focused on a single feature and did not address bug fixes, it provided practical value for users requiring more granular voltage measurement options in their ESPHome setups.