--- product_id: 635710759 title: "Gravity: mmWave C4001 24GHz Human Presence Detection Sensor (12 Meters, I2C & UART)" brand: "dfrobot" price: "ΰΈΏ1387" currency: THB in_stock: true reviews_count: 4 category: "Dfrobot" url: https://www.desertcart.co.th/products/635710759-gravity-mmwave-c4001-24ghz-human-presence-detection-sensor-12-meters store_origin: TH region: Thailand --- # 12m max detection range 24GHz mmWave tech I2C & UART interfaces Gravity: mmWave C4001 24GHz Human Presence Detection Sensor (12 Meters, I2C & UART) **Brand:** dfrobot **Price:** ΰΈΏ1387 **Availability:** βœ… In Stock ## Summary > πŸš€ Elevate your smart space with radar-precise presence sensing! ## Quick Answers - **What is this?** Gravity: mmWave C4001 24GHz Human Presence Detection Sensor (12 Meters, I2C & UART) by dfrobot - **How much does it cost?** ΰΈΏ1387 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/635710759-gravity-mmwave-c4001-24ghz-human-presence-detection-sensor-12-meters) ## Best For - dfrobot enthusiasts ## Why This Product - Trusted dfrobot brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Versatile Connectivity:** Plug & play with Arduino, Raspberry Pi, ESP32/8266 via I2C & UART for rapid prototyping. - β€’ **Reliable Motion Sensing:** Consistent presence detection ensures your projects stay responsive and intuitive. - β€’ **Compact & Power-Savvy Design:** Lightweight and easy to integrate, perfect for always-on smart sensing setups. - β€’ **Robust Environmental Immunity:** Operates flawlessly through snow, haze, dust, and noiseβ€”no false alarms, ever. - β€’ **Precision Human Presence Detection:** Detects humans up to 8m and motion up to 12m for seamless smart automation. ## Overview The Gravity: mmWave C4001 is a 24GHz human presence detection sensor capable of sensing human presence up to 8 meters and motion up to 12 meters. Featuring robust anti-interference capabilities, it performs reliably in diverse environmental conditions like snow, dust, and noise. With I2C and UART interfaces, it integrates easily with popular microcontrollers such as Arduino and Raspberry Pi, making it ideal for smart automation and IoT projects requiring precise, always-on human detection. ## Description Buy Gravity: mmWave C4001 24GHz Human Presence Detection Sensor (12 Meters, I2C & UART): Motion Detectors - desertcart.com βœ“ FREE DELIVERY possible on eligible purchases Review: Performs quite well as a mesh proximity sensor - I integrated this into a LoRa mesh node in my ChatterBox cluster so I could have an off-grid mesh proximity sensor, and it's been working reliably for months now. This is very sensitive. I still don't quite understand the detection area/angle, because it senses motion when I am nearby but seemingly out of its detection range. Thats not really a negative for my purposes, but it might be for yours. I am only using it for a motion/no motion check. The API offers the ability to measure speed and other things. I played with that for a while, just for curiosity, and never got that working consistently. The basic motion sensing does work consistently. The board does use a decent amount of power, so it will use up your battery fairly quickly if you don't have a decent sized one. It gets just a little warm too, nowhere near hot, just a little warm. I leave it running 24/7 and have had no issues from it. For the price and ease of use, I'd say it's quite a good value. Review: Presence mode GOOD -- Speed mode BAD - The sensor works pretty good if you want it to just be a static presence sensor. That of course is only if you drain 10+ hours of your life trying to get the code / communication working so you can configure it. The new protocol document on DFRobot's website helped with being able to actually talk to this thing but after 5 more hours of messing with it I have discovered that in "speedMode" the sensor is basically useless. The noise floor is so high that you cannot reliably detect anything. I have tried it indoors and outdoors with pretty much every possible configuration. I can place the sensor still on my desk and leave the room and it will still detect something every few seconds or so. I think this is due to speed modes reset cycles ( undocumented ) I can also turn the sensitivity to the max and sit right and front of it in speed mode and it will drop my presence every 2 seconds or so. TLDR: This thing is useless in speed mode and works fine in presence mode. Configuring it required 10+ hours of your time to figure out all the of errors in their SDK, documentation, and code. If enough people still want to give it a shot, I can put my code on github as i now have a reliable debug tool that actually works unlike DFRobots. ## Features - Human Detection: It can detect the presence of humans up to 8 meters and detect human motion up to 12 meters. - Distance Detection: It can measure distances from 1.2m to 12m. - Speed Detection: It can detect speeds from 0.1m/s to 3m/s. - Strong anti-interference capability: It is not affected by factors such as snow, haze, temperature, humidity, dust, light, and noise. - Compact size and easy integration. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CZ9D56KK | | Antenna Location | Walkway | | Best Sellers Rank | #76,021 in Electronics ( See Top 100 in Electronics ) #289 in Motion Detectors (Electronics) | | Brand | DFROBOT | | Built-In Media | Gravity-4P I2C/UART Sensor Connector x1, Gravity: mmWave 24GHz Human Presence Detection Sensor (12 Meters, I2C & UART) x1 | | Color | Gold | | Compatible Devices | Arduino, Raspberry Pi, ESP32, ESP8266 | | Customer Reviews | 3.2 3.2 out of 5 stars (7) | | Frequency | 24 GHz | | Item Type Name | motiondetectordevice | | Item Weight | 0.01 Kilograms | | Manufacturer | DFROBOT | | Maximum Range | 12 Meters | | Mfr Part Number | SEN0610 | | Model Number | SEN0610 | | Power Source | Battery Powered | | Smart Home Compatibility | Smart Home Compatible | | Unit Count | 1.0 Count | ## Product Details - **Brand:** DFROBOT - **Color:** Gold - **Item Weight:** 0.01 Kilograms - **Maximum Range:** 12 Meters - **Power Source:** Battery Powered ## Images ![Gravity: mmWave C4001 24GHz Human Presence Detection Sensor (12 Meters, I2C & UART) - Image 1](https://m.media-amazon.com/images/I/51kw9xom8FL.jpg) ![Gravity: mmWave C4001 24GHz Human Presence Detection Sensor (12 Meters, I2C & UART) - Image 2](https://m.media-amazon.com/images/I/513JmGbMROL.jpg) ![Gravity: mmWave C4001 24GHz Human Presence Detection Sensor (12 Meters, I2C & UART) - Image 3](https://m.media-amazon.com/images/I/61cMI0zM1hL.jpg) ![Gravity: mmWave C4001 24GHz Human Presence Detection Sensor (12 Meters, I2C & UART) - Image 4](https://m.media-amazon.com/images/I/616uQd8f-7L.jpg) ![Gravity: mmWave C4001 24GHz Human Presence Detection Sensor (12 Meters, I2C & UART) - Image 5](https://m.media-amazon.com/images/I/6128UbH7VhL.jpg) ## Available Options This product comes in different **Model** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Performs quite well as a mesh proximity sensor *by M***N on February 20, 2025* I integrated this into a LoRa mesh node in my ChatterBox cluster so I could have an off-grid mesh proximity sensor, and it's been working reliably for months now. This is very sensitive. I still don't quite understand the detection area/angle, because it senses motion when I am nearby but seemingly out of its detection range. Thats not really a negative for my purposes, but it might be for yours. I am only using it for a motion/no motion check. The API offers the ability to measure speed and other things. I played with that for a while, just for curiosity, and never got that working consistently. The basic motion sensing does work consistently. The board does use a decent amount of power, so it will use up your battery fairly quickly if you don't have a decent sized one. It gets just a little warm too, nowhere near hot, just a little warm. I leave it running 24/7 and have had no issues from it. For the price and ease of use, I'd say it's quite a good value. ### ⭐⭐ Presence mode GOOD -- Speed mode BAD *by A***R on August 17, 2025* The sensor works pretty good if you want it to just be a static presence sensor. That of course is only if you drain 10+ hours of your life trying to get the code / communication working so you can configure it. The new protocol document on DFRobot's website helped with being able to actually talk to this thing but after 5 more hours of messing with it I have discovered that in "speedMode" the sensor is basically useless. The noise floor is so high that you cannot reliably detect anything. I have tried it indoors and outdoors with pretty much every possible configuration. I can place the sensor still on my desk and leave the room and it will still detect something every few seconds or so. I think this is due to speed modes reset cycles ( undocumented ) I can also turn the sensitivity to the max and sit right and front of it in speed mode and it will drop my presence every 2 seconds or so. TLDR: This thing is useless in speed mode and works fine in presence mode. Configuring it required 10+ hours of your time to figure out all the of errors in their SDK, documentation, and code. If enough people still want to give it a shot, I can put my code on github as i now have a reliable debug tool that actually works unlike DFRobots. ### ⭐ Shorted two ESP controllers. *by A***R on April 16, 2025* The unit I got is defective and ended up shorting two of my micro controllers when wiring it in the recommended way on their website. DFRobot also deleted their C4001 library for Arduino including the GitHub project, so even if my unit was working you now have to manually figure out the data input. ## Frequently Bought Together - Gravity: mmWave C4001 24GHz Human Presence Detection Sensor (12 Meters, I2C & UART) - EC Buying LD2420 Radar Sensor Module 24GHz ISM Human Body Micromotion Millimeter Wave Radar Sensor Module AIOT Smart Home 8M 3.3V 50A --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.th/products/635710759-gravity-mmwave-c4001-24ghz-human-presence-detection-sensor-12-meters](https://www.desertcart.co.th/products/635710759-gravity-mmwave-c4001-24ghz-human-presence-detection-sensor-12-meters) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-04-24*