LD2410c modules always reading HIGH

ESPHome
1

I recently received two LD2410c mmWave modules from Aliexpress. I configured them using the tool, and they correctly read motion.

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I connected them to an ESP32 using this configuration, but they always read motion, even when no one is home.

VCC → 3.3v
GND → GND
OUT → Pin 15

binary_sensor:
  - platform: gpio
    pin:
      number: GPIO15
      mode:
        input: true
        pullup: true
    name: Office Motion
    device_class: motion
    filters:
      - delayed_off: 30s

Any ideas are appreciated.

2

I’m pretty sure VCC should be 5V (at least)

3

Thanks @koying, I thought so too, so originally I had tried it with 5v, then found a spec sheet that said 3.3v.

I disconnected the sensor from the pin and it still reads that motion is detected, even with nothing connected to it. Based on that I think my issue might be different than originally expected, but I don’t know where to go from here.

4

Try pulling the pin down.

5

Thanks for the suggestion. That didn’t seem to help either.

6

My ESP32 also always detects even when noone is home. i only just discovered when troubleshooting that when i put the code on a esp8266 board it worked without issues.
i believe there is something happening with the ESP32 devices. as i tried 4 different esp32 boards and all the same result.