How to work with HLK-LD1115H and Wemos D1 Mini for Human Presence Detection

ESPHome
1

I have a HLK-LD1115H and a Wemos D1 Mini that I am trying to set up for mmWave Presense Detection like this (mmWave Presence Detection - ESPHome style - Share your Projects! - Home Assistant Community (home-assistant.io)) as one of my first more advanced projects using EspHome.

  • When logging the UART interaction I do see mov_ and occ_ values when moving in front of the sensor and when nothing is moving in front of the sensor.
  • I’m not sure how to use the Vo, sensor output pin and if it provides anything useful. I thought it would be similar to the DFRobot chip and output true/false depending on if motion is detected.
  • If the Vo pin doesn’t provide anything useful, I still need to figure out how to translate the mov_ and occ_ values to a binary sensor for use in home assistant automations.

Here is the sensor schematic for the HLK-LD1115H.

image
image791×788 15.4 KB

Here is the additional documentation on the HLK-LD1115H.

Screenshot 2022-06-22 at 17.08.59
Screenshot 2022-06-22 at 17.08.591540×1844 257 KB

Here is my yaml code:

esphome:
  name: human-presense

esp8266:
  board: d1_mini

# Enable logging
logger:
  level: VERY_VERBOSE
  baud_rate: 0

# Enable Home Assistant API
api:

uart:
  id: uart_bus
  tx_pin: GPIO4
  rx_pin: GPIO5
  baud_rate: 115200
  debug:
    direction: BOTH
    dummy_receiver: true
    after:
      delimiter: "\n"
    sequence:
      - lambda: UARTDebug::log_string(direction, bytes);
      
binary_sensor:
- platform: gpio
  name: mmwave_in_bedroom
  pin:
    number: D6
    mode:
      input: true
      pullup: false

ota:
  password: otaPassword

wifi:
  ssid: SsidName
  password: SsidPassword

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Human-Presense Fallback Hotspot"
    password: "hotSpotPassword"

captive_portal:

Here’s how I wired it up:

Untitled
Untitled1600×900 136 KB

10 Likes
2

Have you broken out the multi-meter and checked Vo to see what voltage is reported with and without motion/presence?

3

I now have a multimeter. I’m not 100% sure how to test the pin. Would I just put the multimeter on DC voltage and then put the common on the wemos d1 mini’s ground and then the red tester on the GPIO pin and then simulate motion?

4

Ok that worked, when there is movement, the voltage reads 3.0v. When there is no movement, the pin reads 0.

5

That’s good to hear, sounds like it works as expected.

6

I still don’t have the esphome configuration setup correctly though. I tried to use a binary_sensor like this, but it just always stays on.

binary_sensor:
- platform: gpio
  name: mmwave_in_bedroom
  pin:
    number: GPIO16
7

I think the next logical step in testing would be;

  • disconnect everything from GPIO16 and confirm state
  • apply 3-3.3V to GPIO16 from a DC PSU and confirm state
8

Use option mode:INPUT_PULLDOWN

9 
binary_sensor:
  - platform: gpio
    name: mmwave_in_bedroom
    pin:
      number: GPIO16
      mode: INPUT_PULLDOWN

Tired this, no luck. The binary sensor always stays off.

10

Here is mine reporting both presence and occupancy.
I use only UART.

Screenshot 2022-07-04 at 11.39.09
Screenshot 2022-07-04 at 11.39.092026×1154 320 KB

11

Hi, I use this config and works for me, try changing the port and config:

binary_sensor:
- platform: gpio
  name: occup_cozinha
  pin:
    number: GPIO17
    mode:
      input: true
      pulldown: true
12

Great work !

13

LD1115H
LD1115H914×395 15.5 KB

Some time need to power down the radar or plug out the Tx Cable, or ESP32 might boot fail.

2 Likes
14

Here is the config I’m using in the last week. If you put in right position works every time.

15

I get this error

ERROR Error while reading config: Invalid YAML syntax:

while parsing a block mapping
in “/config/esphome/esphome-web-d25724.yaml”, line 154, column 3:
- platform: gpio
^
expected , but found ‘’
in “/config/esphome/esphome-web-d25724.yaml”, line 159, column 5:
mode:
^

Edit: number: ${LD1115H_INPUT_PIN} has extra indent

binary_sensor:
- platform: gpio
  name: occup_${location}
  device_class: occupancy
  pin:
      number: ${LD1115H_INPUT_PIN}
    mode:
      input: true
      pulldown: true
16

I can get yours running for a few seconds then the esp32 will hang

Edit:
If i don’t open the web server or put my hand to close to the sensor it doesn’t hang the esp32 anymore.

17

To avoid esp32 hangs try removing this options:

logger:
  level: VERY_VERBOSE
  baud_rate: 0
18

Hello. Can you please share the whole datasheet for the sensor? I hope what is in the photo is not the whole document. I have the sensor working and outputting data right now but I want to make it configurable via ESPHome. Now I am sending commands and nothing changes.

1 Like
19

Hi Vladimir,

I’ve also requested the “datasheet” from the supplier. You can find it here

1 Like
20

I’m so glad I found this thread! I’ve also ordered the HiLink HLK0LD1115H as a substitute to the DFrobot-variant. I had some trouble hooking everything up, but using this thread helped me a lot.

I’ll come back if I get some of the solution above working :slight_smile: