About HLK-LD2420, you can also try the software in this link: https://github.com/JoaoSandrini/LD2420-Radar.

I have an improoved version of HLK-LD2420 running on ESP32 with SSD1306 display. It also has a diagnostic. I'm not a programmer (my expertise is hardware/IoT), so I had help form Artificial Inteligence. /*
* BasicUsage.ino - Basic example for LD2420 Radar Sensor Library - ESP32 Version
*
* This ...

Hellow, I have the HLK-2420 working fine. I have two versions: one with ESP32 only and another one with ESP32 + SSD1306 display. I used the reference from: https://github.com/cyrixninja/LD2420. /*
* BasicUsage.ino - Basic example for LD2420 Radar Sensor Library - ESP32 Version
*
* This example ...