Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Frequency | 24.125 GHz |
| Detection Range | Up to 8 meters |
| Beam Angle | Approx. 90 degrees |
| Supply Voltage | DC 3.3V - 5V |
| Current Consumption | < 20 mA |
| Output Signal | Analog voltage / Digital pulse |
| PCB Dimensions | 24mm x 16mm x 2mm |
| Operating Temperature | -20°C to +70°C |
| Material | FR-4 PCB with ceramic antenna |
| Application | Automatic lighting, security alarms, smart home |
Anonymous
Mar 28, 2026
Rating: 4/5
Good sensitivity, needs calibration
The sensor is very sensitive, which is great, but I had to tweak the gain resistor to stop false triggers from my ceiling fan. Once calibrated, it has been working flawlessly for my hallway lights.
Anonymous
Mar 24, 2026
Rating: 5/5
Great for student projects
We used these in our robotics club for obstacle avoidance and presence detection. They are robust and handle the 5V logic level easily with a simple comparator circuit. No issues so far.
Anonymous
Mar 21, 2026
Rating: 3/5
Works well but range varies
The module functions correctly, but I found the detection range drops significantly if there is metal nearby. Make sure to mount it away from large metal objects for best results.
Anonymous
Mar 08, 2026
Rating: 5/5
Perfect for my DIY security project
This HB100 module works exactly as described. The detection range is impressive for such a small component, and it picked up motion reliably through a thin plastic cover. Integration with my Arduino was straightforward.
Anonymous
Mar 06, 2026
Rating: 4/5
Compact and reliable
Small form factor makes it easy to hide in fixtures. The output signal is clean. Only giving 4 stars because the datasheet could be more detailed regarding the analog output scaling.
Anonymous
Mar 04, 2026
Rating: 5/5
Excellent value for money
I bought five of these for various prototypes. They are consistent in performance and the 24GHz frequency seems to penetrate materials better than the PIR sensors I used previously. Highly recommended.
Q: Can this sensor detect motion through a wooden door?
A: Yes, microwave radar signals can penetrate non-metallic materials like wood, plastic, and glass. However, the effective range will be reduced depending on the thickness and density of the material.
Q: Can I power this directly from a 3.3V pin on an ESP32?
A: Yes, the operating voltage range is 3.3V to 5V, so it is fully compatible with 3.3V logic systems like the ESP32 or Raspberry Pi without needing a level shifter.
Q: What is the difference between the HB100 and standard PIR sensors?
A: Unlike PIR sensors that detect heat changes, the HB100 uses Doppler radar to detect movement via frequency shifts. This allows it to detect stationary micro-movements (like breathing) and work through non-metallic obstacles, whereas PIR requires a direct line of sight and significant temperature contrast.
Q: Is the output digital or analog?
A: The raw output is an analog voltage proportional to the detected motion strength. Many users add a simple comparator circuit (like an LM393) to convert this into a clean digital HIGH/LOW signal for microcontrollers.
Q: Does this module come with a lens or housing?
A: No, this is a bare PCB module intended for integration into custom enclosures or products. You will need to design or source your own housing and lens if required for your specific application.
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