Supporting files for "DIY Arduino calorimeter: Converting commercial thermally insulated coffee-cups into precision isobaric calorimeters"

We present the design, construction, and validation of a low-cost digital calorimeter intended for teaching thermochemistry in chemistry, engineering, and life sciences curricula. The device repurposes a commercial 380 mL thermal container with integrated magnetic stirring, transforming it into a closed adiabatic system suitable for calorimetric experiments. Temperature monitoring is achieved with a waterproof Dallas DS18B20 digital sensor interfaced to an Arduino UNO board, allowing flexible resolution and automated data acquisition. Open-source software provides real-time graphical visualization, CSV export, and optional Windows executables for straightforward deployment. Compared to traditional educational calorimeters based on manual thermometry, this device offers improved reproducibility, elimination of reading errors, and enhanced student engagement through live data analysis. In contrast to professional-grade commercial calorimeters (US $15,000–100,000) and basic educational kits (US $50–500 without digital monitoring), our Arduino-based system (~US $30 in components) provides an accessible middle ground that democratizes laboratory experimentation. Validation experiments, including neutralization and dissolution reactions, confirm reliable thermometric response, stable equilibrium detection, and enthalpy values consistent with literature. This open-hardware calorimeter not only broadens access to thermochemistry education but also serves as a platform for interdisciplinary training in electronics, programming, and laboratory automation, fostering early exposure to modern research practices.本研究介绍了一款低成本数字热量计（digital calorimeter）的设计、搭建与验证流程，该设备专为化学、工程学与生命科学课程体系中的热化学教学场景开发。本设备通过改造一款集成磁力搅拌功能的商用380毫升保温容器，将其改造为适用于量热实验的封闭绝热系统。通过与Arduino UNO主控板相连的防水型Dallas DS18B20数字传感器实现温度监测，可灵活调整分辨率并支持自动化数据采集。配套开源软件可实现实时图形可视化、CSV格式数据导出，同时提供可选的Windows可执行程序，便于快速部署使用。 相较于传统基于人工测温的教学用热量计，本设备具备更高的实验重现性，可消除读数误差，并通过实时数据分析提升学生的参与度。与售价15000至100000美元的专业级商用热量计，以及不含数字监测功能、售价50至500美元的基础教学套件相比，本基于Arduino的系统（元件成本仅约30美元）提供了兼顾性价比与性能的中间方案，推动实验室实验的平民化普及。通过中和反应与溶解反应等验证实验，本设备的测温响应可靠、平衡检测稳定，所得焓值与文献报道结果一致。 这款开源硬件热量计不仅拓宽了热化学教学的可及性，同时可作为电子学、编程与实验室自动化跨学科培训的平台，帮助学生早期接触现代科研实践方法。