Hello DFRobot Support Team,

I’m integrating the C1001 mmWave Human Detection Sensor into my fall‑detection project but have run into a few issues and would appreciate your guidance.

1. Human Presence Issue
Even when no one is in the room or very far away , the LED is on and the web page reports that a human is present. Do you think the sensor has gone bad? It wasn’t like this before. Do you think it could be an ESD issue? I’ve taken the necessary precautions—using an ESD cover and handling the module by its edges.

2. Fall Detection Issue
The sensor never transitions to “Fallen,” even when a person remains on the floor for several minutes or actually falls. These are my current settings:

hu.dmInstallHeight(270); // Sensor mounted 270 cm above ground
hu.dmFallTime(5); // Wait 5 s before confirming a fall
hu.dmUnmannedTime(1); // Wait 1 s before reporting “no one present”
hu.dmFallConfig(hu.eResidenceTime, 200); // 200 s of stillness = “stationary dwell”
hu.dmFallConfig(hu.eFallSensitivityC, 3); // Maximum fall sensitivity
hu.configLEDLight(hu.eFALLLed, 1); // Enable fall‑status LED
hu.configLEDLight(hu.eHPLed, 1); // Enable presence‑status LED
hu.sensorRet(); // Apply settings

Are there any additional parameters or calibration steps I should adjust to improve fall‑detection reliability?

3. Enclosure Concerns
We plan to enclose the sensor in a 3D‑printed PLA case. Could you please advise on:

Material penetration: Will the radar pulses reliably penetrate standard PLA palstic?

Antenna clearance: Is there a recommended minimum distance between the sensor’s antenna and the inner surface of the case?

Case thickness: What wall thickness (if any) do you recommend to minimize signal attenuation?

I currently have this 3d case printed :

4. Soldering Precautions
Are there any precautions I need to take or new considerations when soldering the module onto the board via header pins?

We are participating in a global competition and our idea has been selected. May 5 is the deadline, so your quick support would be highly appreciated. Here is the link to our project:
https://www.hackster.io/nikhilbhatprofessionemail24/sentinel-fall-smart-radar-ble-based-fall-detection-system-265fd4
https://www.hackster.io/contests/board-designer

Thank you very much for your assistance and any tips you can share.

Best regards,
Nikhil Bhat