Design and Implementation of Clothesline And Air Dryer Prototype Base on Internet of Things

Drying clothes is an activity that takes a lot of time if you have to wait and keep them dry. Not infrequently, clothes that have been dried in the sun get wet again because of the rain, and no one picks them up for various reasons. In addition, clothes that have been left on the clothesline for a long time have the potential to get moldy, especially when the humidity level is high. An IoT-based prototype automatic clothesline and air dryer were designed. The working system of this tool is briefly the Arduino Nano microcontroller processes input from 3 sensors (light sensor, rain sensor, and humidity sensor), then gives an instruction signal to the actuator (motor and fan) to respond to various input combinations. In addition, this tool is also integrated with the Internet of Things system (using the Node-Red application) for remote monitoring and control processes. This tool has been tested to respond to all conditions appropriately according to the desired specifications. Namely, the motor pulls the clothesline into the storage room when the system detects night (lighting 400 lux) or detects rain (water > 0.1 mL). Then the dryer fan will turn on when the system detects a high humidity level (> 65%), and the clothesline is in the storage room. The average delay of the motor in responding to input/instructions in manual mode is 1.42 seconds and in automatic mode is 0.66 seconds. The average fan delay in responding to input/instructions in manual mode is 1.20 seconds and in automatic mode is 0.91 seconds. Then, the average time it takes the dryer fan to reduce 1% humidity is 59.68 seconds.