A Low-Cost wet Diaper Detector Based on Smart Phone and BLE Sensor

People who have severe retardation or dementia are not able to handle their urination themselves, wet diaper detection is very important for them. Wet diaper creates several types of rashes such as irritation, candidal infection, allergic reactions, Seborrhea etc. As a result, guardians always need to check whether the diaper is dry or wet. Though there are several system and sensor for detecting wet diaper, they are expensive and complex. In this paper, a low-cost smart care system is designed to detect wet diaper based on Smartphone and Bluetooth low energy (BLE) transmitter. The flexible conductors placed into the most urine absorption area into the diaper. The wetting of the diaper decreases the resistance between two terminals which are connected with conductors. As a result, terminals resistance fall down below the predefine resistance value and BLE transmitter send the warning alarm to the Smartphone application and the phone starts ringing.