THE DESIGN OF LIQUID REFILL STATION FOR DISH SOAP PRODUCT BASED ON INTERNET OF THINGS (IOT)

• Main Author: Nurrahmawati, Aminah
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68110
• Institution: Institut Teknologi Bandung

A device for refilling dish soap or liquid refill station has been designed which aims to reduce plastic waste from dish soap containers. The tool works equipped with 2 pumps and a water flow sensor. So that customers can choose the volume and type of dish soap they want to buy from the 2 available brands. The selection of the brand and volume of dish soap is done by pressing the preset keypad character. Payment for product purchases is made using Near Field Communication (NFC) reader PN5322 technology and a Mifare card. With this Mifare card, customers can also top up their balance for payment. Data processing uses Arduino Mega 2560 which is connected serially with RaspberryPi 3 B as a mini computer to run the entire program. All purchase data in the form of customer ID, brand of laundry soap purchased, volume of laundry soap purchased and date of purchase and remaining volume in the tank are sent to the MySQL database via the NodeRED platform which has been installed on the Raspberry Pi 3B and connected to the Arduino Mega 2560. the residual volume in the tank is monitored and displayed on the Grafana dashboard. Prediction of the time-out of dish soap volume in the tank is done using linear regression. With the independent variable in the form of time (days) of purchase and the dependent variable in the form of the remaining volume of dish soap on the tank. Prediction uses training data taken from the remaining volume data in the tank when it is first filled until it is first used up. From the training data, it was found that the coefficient of determination R2 = 0.99 for the first and second brands.