<![CDATA[This study aims to analyze the reliability and accuracy of the HC-SR04 ultrasonic sensor compared to manual measurement results. The data used in this study are secondary data obtained from five previous studies in the form of distance measurement results using the HC-SR04 ultrasonic sensor and manual measurements as reference values. The data were analyzed using several statistical methods, including error analysis, mean, standard deviation, linear regression, correlation coefficient (R), Root Mean Square Error (RMSE), and sensor calibration. The results showed that the HC-SR04 ultrasonic sensor has good accuracy and reliability in distance measurement. The average relative error values obtained from each study were 0.81%, 1.54%, 1.52%, 2.28%, and 7.29%, while the RMSE values obtained were 0.6325 cm, 0.8367 cm, 0.1745 cm, 0.2429 cm, and 0.4323 cm. The correlation coefficient analysis showed a very strong relationship between the sensor readings and manual measurements, with R values ranging from 0.9827 to 1.0000. Furthermore, the linear regression analysis indicated that the changes in sensor readings followed the changes in manual measurement results linearly. The regression equations obtained were then used as the basis for the calibration process to reduce deviations between sensor measurement results and reference values. Based on the analysis results, the HC-SR04 ultrasonic sensor has good measurement performance, high consistency, and is suitable for use as an alternative digital distance measuring instrument.]]>
