Smart Saline Monitoring and Alert System Using IoT

Abstract: Giving a patient IV saline is about as routine as hospital care gets, yet how that drip is tracked has barely changed in decades — a nurse still walks over and eyeballs the bottle. Drip rates are set by hand, and hand-set rates drift, so pinning down exactly when a bag will run dry is more guesswork than science. If nobody catches an empty bottle in time, the consequences are not trivial: blood can back up into the line, the line can become contaminated, or, worse, air can enter the vein and trigger an embolism.The moment fluid drops into the Low band, the system does more than flash a light. A buzzer sounds close to the patient, and a SIM900 GSM/GPRS module sends an SMS directly to the caretaker's phone over the cellular network — a channel that keeps working even when hospital Wi-Fi is congested or down entirely, so the message gets through regardless. To stop staff being bombarded with repeat alerts for a single event, the firmware relies on state flags that cap each threshold breach at exactly one notification.Cost was a deliberate design constraint: every part is a common, off-the-shelf component, and the total build comes in well under the price of a commercial infusion-monitoring pump, which makes the system a realistic option for hospitals and clinics working with tight budgets.

Keywords: Smart Saline Monitoring, Internet of Things, ESP32, Load Cell, HX711 Amplifier, GSM Alert System, IV Fluid Monitoring, Patient Safety, Embedded Healthcare System, Alarm Fatigue Reduction.