5.8GHz Doppler Effect Microwave Motion Sensor Compatible with Arduino and Raspberry Pi Motherboard. for Industry, Transportation, Agriculture, Smart Home, Security Monitoring, etc.

I just ordered this, it seems like.I'm qualified enough to incorporated into my robotic system. Honestly, the simple concept of this device in this size I'm sure we'll be seeing more similar devices. With many different uses.I just received the board. My plan Is by using four of them behind drywall to make a hallway impossible 2 Get through without detecting motion. These things work perfect for hidden motion sensor.I will update more opinion when im further along in my projectin the project.

This works but I have trouble with it picking up the 433HMz transmitter that I use to communicate to the base station. I have tried to disable it during the transmit with limited success.

THIS ROCKS. 10/10. For the 10ghz model. Make sure to twist the physical knob more in the middle for range, it comes dialed all the way down out of box and if you're over eager and wire and code a test w/o reading the instructions you'll miss that crucial step. Lastly make sure you understand the positioning described for how to aim it. It's not hard but again if you skip the step your readings will be all over and it's not the device it's your lack of aim for it. Works extremely well and super fun and great price and great documentation (when you stop to read it lol). Bravo. P.S. tip to seller for "6 star" product lol, dial the sensitivity dial half way before shipping it works better out of box for the basic "does it really work!?!" test. Second, would be cool to print on the board an arrow with tiny text to the effect of "point this way" (and we know that means the target area for the sensor). Minor suggestions ! Love the device and seriously want to order so many more.

I've been playing with these radar modules of different types for the last couple years and had high hopes but somewhat dissapointing

Nice module. I have the 10Ghz unit. Very easy to test, all you need is a 5v power source.I did have glitches on the detection if I used the Arduino's power, so I used a battery with the grounds connected.The test code for Arduino is available on the CQROBOT WIKI. The code will detect the amount of movement detected.Basically it detects if someone or something is moving, and has a range adjustment to control the distance. It seems quite sensitive to the main beam coverage. Movement will make the LED blink on the back of the module.You could hook this up to a warning light, alarm, or trigger a camera for security, with additional circuitry.

This the question for any sensor is "what is its specific purpose"? I am not 100% sure the target application for this sensor. The vendor compares this to a PIR sensor, but I do not see these two sensors being interchangeable.A PIR sensor can detect objects that come in front of the sensor as well as when they leave the sensor. Atypical PIR sensor will out a HIGH signal when an object is in front of it and a LOW signal when there are no objects present. It does this by detecting IR that is reflected off an object into the sensor. Therefore, a PIR can detect motionless objects, as long as they are in front of the sensor, making these popular for security applications.This device appears to only detect motion. Using simple code that reads the status of the device signal as HGH or LOW, it is evident that when an object is moving the signal can be detected as LOW. When the signal is HIGH, it indicates no moving objects.The above statement is not entirely true though. When I observed output signal in my oscilloscope, I saw a much different behavior. The device outputs 5V on the signal line when there is absolutely no motion in front of the device. When an object begins to move, the output is a square wave where the duty cycle (not frequency) is adjusted based on the speed of the object moving. This is pretty awesome if you can interpret the output and convert it to velocity and/or acceleration. The documentation, however, does not provide this information.If you plan to use this in place of a PIR, save your money. You can purchase five PIR’s or this price and spread them out around a large room. You could also add a small Wi-Fi card and a battery to make them wireless and still not spend this much.If you want to make your security application better by being able to detect when an object comes into a room as well as detect it moving around the room, this sensor paired with a PIR could work very well.If you want to detect the speed of an object, this sensor may be able to do that if you can decode the output. I did not spend any time trying to figure this out. I may do that at a later time. If this is possible, it would be nice if the vendor could provide information.Several times I mentioned the “front” of this device. Well, which side is that? The documentation says the potentiometer is on the back, but the device is most sensitive on the back side. Later in the documentation its states to make sure the side with the wire is facing the objects to be detected. This is consistent, but this seems to be the side that is not as sensitive to object movement. So, the sensor appears to be on the back of this device based on observation, but on the front based on documentation. Everything else is labeled very well on the board so why not just label the sensor side? I did find, however, that this device works well from the front when the back is against a hard surface.Although there is documentation, it has some issues. First, it gives a lot of information that does not help. It explains the theory behind the sensor but provides very little detail about the signal output. Second, the Arduino example and the Raspberry Pi examples are completely different approaches to using the sensor and the documentation does not really explain why. If there are different ways to use the sensor, please explain them. Finally, the Pi example was clearly not tested because it has a glaring syntax error that will prevent it from compiling.There is a switch on the back of the device to change between a 5V and 3V3 logic level. This is a nice feature. When using an a 5V device you can get away with using it in 3V3 mode, but you cannot use it in 5V mode for 3V3 devices.Conclusion? This is a well-made sensor that offers great sensitivity to motion that you will not find in any other sensor. With the right software, this sensor could potentially offer even more functionality.

The device appears to be well built. The instructions are not very clear but the operation is fairly obvious. One thing not mentioned in the ad is that the module outputs a roughly square wave which is the digital version of the Doppler signal. It is unsuitable to directly drive a relay. You need a one-shot or the digital equivalent using a micro controller if you want to drive a relay. On the other hand, by measuring the frequency of the signal, you get an idea of how fast the object is approaching or going away.The antenna pattern is not omnidirectional. The beam is narrower in the plane of the longest dimension. But I found that sensitivity is still good at almost 90 degrees from the main axis of the sensor (I was detected at 10-15 feet coming off the side when adjusted to the highest sensitivity), so that may be enough for many applications.I like that it has 4 mounting holes and comes with the connector and wire harness and LED indicators.

perfect just what i needed