C4001 Sensor problem when in case

Hi all,

I am using the Gravity: mmWave C4001 24GHz Human Presence Detection Sensor (12 Meters, I2C & UART) sensor. It works fine when outside the case. When inside the ABS case, the energy level goes crazy and have seen values up-to 60K. Any help is highly appreciated.

Logs :

speed=-3.280 m/s, range=0.53 m, energy=40290

My settings are:

C4001 (DFRobot) connected at 0x2A

min range = 55

max range = 300

threshold range = 500

code:

c4001.setSensorMode(eSpeedMode);

/*

* min Detection range Minimum distance, unit cm, range 0.3~20m (30~2000)

* max Detection range Maximum distance, unit cm, range 2.4~20m (240~2000)

* thres Target detection threshold, 0.1 units, range 0~65535

*/

if (c4001.setDetectThres(55, 300, 500)) {

log_i("set detect threshold successfully");

}

// set Fretting Detection

c4001.setFrettingDetection( eON );

log_i("min range = %d", c4001.getTMinRange());

log_i("max range = %d", c4001.getTMaxRange());

log_i("threshold range = %d", c4001.getThresRange());

log_i("fretting detection = %d", c4001.getFrettingDetection());

log_i("");