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Existing techniques for diagnosing gastrointestinal disorders in stomach, small and large intestines, and colon depend on biopsy, endoscopy or colonoscopy methods which are invasive, expensive and time-consuming. In fact, such methods also lack the ability to access large parts of the small intestine. In this article, we demonstrate a smart ingestible biosensing capsule that is capable of monitoring pH activity in small and large intestines. pH is a known biomarker for several gastrointestinal disorders such as inflammatory bowel disease. Functionalized threads utilized as pH sensing mechanism are integrated with front-end readout electronics and 3D-printed case. This paper demonstrates a modular sensing system design that alleviates the sensor fabrication difficulties as well as the overall assembly of the ingestible capsule.