Energy Harvesting System Based on Mini Wind Turbine for IoT Connected Devices

Connected devices are an essential component of the digital transformation as it plays a part in the acquisition of physical. The basic requirement of every connected device is an uninterrupted power supply. However, in practice it is difficult to access the power supply system everywhere. Energy harvesting systems are therefore very important in the digital transformation era. This paper presents Wind power harvesting with low wind speeds as a power source for connected devices. The proposed energy harvesting system consists of four parts: 1. Small wind turbine 2. Boost converter circuit 3. Battery and lithium battery charger circuit 4. Buck converter circuit and 5. Device. connect with sensor. To prove that the proposed system can produce electricity from low-cycle wind power to become a power source for connected devices, this article has created a prototype system. The experimental results showed that 1) Voltage value obtained from using wind turbines to generate wind power the average speed is 14.6 km/hr and give power is 10mW. 2) The result of the experiment of creating a boost converter circuit by generating a PWM signal from the NodeMCU ESP8266. The input voltage is 1V and the output voltage is 4.56V. 3) Result of assembling a boost converter circuit with a wind turbine the input power is 15.75mW, the output power is 9.873mW. By programming the microcontroller to work in active mode alternating with deep sleep, connected devices can work continuously for 24 hours.