Multimode optical fiber interrogator-based LiDAR for intravenous drip monitoring

•A new intravenous drip monitoring system was proposed and demonstrated using low-cost LiDAR and multimode optical fiber.•The ESP32 microchip and the TF-mini-s LiDAR module are embedded in a 3D printed case, then a compact device is achieved.•The fiber optic system offers a resolution time of 20 ms, a good SNR(13dB), low power consumption, and a flow rate of 93 dpi.