Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Frequency | 24 GHz ISM Band |
| Detection Range | 0.5m to 8m (Adjustable) |
| Communication Interface | UART / TTL |
| Supply Voltage | 3.3V DC ±0.3V |
| Current Consumption | < 60mA (Active Mode) |
| Beam Angle | ±60° Horizontal, ±40° Vertical |
| Micro-Motion Sensitivity | Detects breathing and chest movement |
| Operating Temperature | -40°C to +85°C |
| Dimensions | 24mm x 16mm x 2.5mm |
| Protocol Support | Hi-Link Custom Protocol & Modbus |
Anonymous
Mar 27, 2026
Rating: 4/5
Good value for money
For the price point, the performance is outstanding. It handles through-plastic detection well, so I could mount it inside a junction box. Deducting one star because the default firmware settings are a bit too aggressive out of the box.
Anonymous
Mar 26, 2026
Rating: 5/5
Perfect for smart home presence detection
This sensor is incredibly sensitive. It detects my breathing even when I am sitting completely still reading a book, which solved the issue of lights turning off automatically in my office. The UART interface was easy to connect to my ESP32.
Anonymous
Mar 26, 2026
Rating: 5/5
Superior to standard PIR sensors
Unlike traditional PIR sensors that only detect gross motion, this millimeter wave radar picks up micro-movements. I used it for a bedroom automation project, and it never fails to detect occupancy. Highly recommended for advanced projects.
Anonymous
Mar 13, 2026
Rating: 5/5
Game changer for lighting control
Finally, a sensor that doesn't turn off the lights while I'm working at my desk. The micro-motion detection is the key feature here. Integration with my custom controller was straightforward using the provided protocol docs.
Anonymous
Mar 10, 2026
Rating: 4/5
Great range, needs calibration
The 8-meter range claim is accurate in open spaces. However, you need to spend time configuring the sensitivity thresholds via the serial tool to avoid false positives from ceiling fans. Once tuned, it works flawlessly.
Anonymous
Mar 06, 2026
Rating: 5/5
Reliable and compact
The form factor is tiny, making it easy to hide behind fixtures. The documentation provided by Hi-Link is decent, and the community support helps with integration into Home Assistant. No issues after 3 months of continuous operation.
Q: Can this sensor detect humans through a thin wooden door?
A: Yes, the 24GHz millimeter wave can penetrate non-metallic materials like wood, plastic, and drywall to some extent. However, detection range and sensitivity will be reduced depending on the thickness and density of the material.
Q: Does this module come with an antenna included?
A: Yes, the module comes with a built-in PCB antenna. You do not need to purchase or attach an external antenna for standard operation.
Q: Is there a Python library available for parsing the UART data?
A: Hi-Link does not provide an official Python library, but the communication protocol is documented in the datasheet. Many users have created open-source parsers for Python and Node-RED which you can find on GitHub.
Q: Can I adjust the detection distance via software?
A: Absolutely. You can configure the maximum detection range, sensitivity levels, and blanking areas using the Hi-Link debugging tool over the UART interface to suit your specific environment.
Q: What is the maximum number of targets this module can track simultaneously?
A: The LD2420 is primarily designed for single-target presence detection and micro-motion sensing. While it can filter out clutter, it is optimized for determining if a specific zone is occupied rather than multi-target tracking.
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