| Soap Usage (drops) |
The drops of soap used for current hand washing event |
The microcontroller records the total number of soap drops. |
| Lathering Time (second) |
Soap lathering time |
Once system software detects the soap dispenser being activated, it will start a timer for this parameter. This timer adds an average frame time (1second/frame rate) for every processed frame, if only one hand is detected (lathering) and the system software detects hand under water running faucet over one second, the lathering timer will be stopped. |
| Paper Towel Usage (piece, gram) |
The number and weight of the used paper towel (s). |
The microcontroller on the Wi-Fi module inside the paper dispenser counts the total number of paper used through trigger signals from the motor inside the dispenser. A scale is placed under the waste receptacle measuring the weight of a used paper towel. |
| Water Temperature (°C) |
Water temperature |
The MCU reads the temperature sensor once per iteration and stores the reading in to a 128 elements temperature buffer. If water is being turned on, MCU will send an averaged buffer temperature reading once every two seconds. The server program monitors the serial communication data from MCU for message that contains “TEMP”, and extracts the water temperature data and puts it in to another buffer. One averaged temperature data from this buffer is recorded into the log file for one hand washing event. |
| Water Usage (liter) |
The volume of water used during hand washing event |
The MCU reads Hall Effect flow sensors (in both hot and cold water pipe lines) and calculates of water usage at the end of a hand washing event. |
| Hand Washing Duration (second) |
Hand washing time including wetting time and rinsing time |
The system software monitors the hand location. Once it detects the hand under a water running faucet, it will start a timer for this parameter. |
