Development of Ultrasonic Anemometer Using HC-SR04 with Kalman Filter Based on Microcontroller Integrated IoTIvan Adi Kuncara, Jatmiko Endro Suseno, Setyawan Agus and Isnain GunadiE3S Web Conf., 202 (2020) 15011DOI: https://doi.org/10.1051/e3sconf/202020215011