56key keyboard and 1.14 inch TFT screen enable easy data entry and clear viewing of information. The onboard SPM1423 digital MEMS microphone and builtin speaker support voice operations such as recording, wakeup and audio playback. The infrared emitter allows infrared control interaction with external devices such as air conditioners. Cardputer offers a HY2.04P interface for expanding I2C sensors such as temperature and humidity sensors, light sensors and pressure sensors, which allows users to add different functional modules according to their needs and unleash their creativity. Cardputer features a powerful dualcore processor, supports WiFi functionality and integrates various peripherals and sensors, making it suitable for rapid functional verification, industrial control and home automation systems. Cardputer is a portable computer that is for engineers. The heart of Cardputer is M5StampS3, a mini development board based on the ESP32S3 chip. Use scenarios Rapid functional verification and firmware testing: connect I2C sensors via the HY2.04P interface, utilize the 1.14 inch TFT display for monitoring, and use WiFi and builtin audio for testing cloud connectivity and voiceenabled features. Industrial control and monitoring: deploy sensors for environmental and process data, leverage the dualcore processor and WiFi for realtime data processing and remote access, and use IR control for compatible equipment. Home automation and field engineering: portable, plugandplay sensor expansion, onsite testing and debugging of smart devices, and voice or IR interactions to verify userfacing control workflows.