Hi,

ESP and sensor do share a common ground, the sensors ground is directly hooked up to ESPs 3.3V and GND,

I dont have a USB to Serial Adapter, so i cant check.
But i got it to work somehow using HarwareSerial.h



#include <HardwareSerial.h>

#define RADAR_RX_PIN 33 // RX pin on ESP32
#define ...

Hi there,

i ordered some HLK LD2420 presence sensors from AliExpress ( https://www.aliexpress.com/item/1005005849700627.html?spm=a2g0o.productlist.main.1.29003034mdLCUH&algo_pvid=172376ad-a2df-4fa9-8ace-b5437439ba81&algo_exp_id=172376ad-a2df-4fa9-8ace-b5437439ba81-0&pdp_npi=4%40dis%21EUR%2113.05 ...