Why is the output of my mmWave Radar - 24GHz Human Presence Detection Sensor always 1?

1. Due to the high sensitivity of this millimeter-wave radar sensor, please ensure that the sensor is fixed firmly when using it. When holding it, the sensor will continuously output high level due to slight shaking.

2. Please try to change the sensor measurement range in the code or serial port settings, and make sure that there is no object moving within the range, and check whether the sensor value returns to normal.