In March 2026, Michael Kerscher developed DeltaSol CS4 sensor support for the esphome repository, expanding its compatibility with Citrin Solar 1.3 hardware. He focused on embedded systems and IoT development, implementing robust error handling and comprehensive metrics collection for temperature and operational states. Using C++ and Python, Michael integrated sensor data streams to enhance monitoring capabilities for solar systems, addressing reliability and observability requirements. Although the work spanned a single feature over one month, it demonstrated depth in sensor integration and careful attention to system robustness, resulting in a maintainable addition that improved esphome’s hardware support for solar monitoring applications.