CQRobot Ocean: 10.525GHz Doppler Effect Microwave Motion Sensor Compatible with Raspberry Pi and Arduino Board. for Industrial, Measurement, Automatic Doors, Sensor Lights, Reversing Radar, etc.

"What is the specific purpose of this sensor?" is the question that every sensor must answer. I do not know what the target application for this sensor is for this sensor is for this sensor is for this sensor is Although the vendor compares it to a PIR sensor, I don't believe the two sensors are interchangeable. Objects that come in front of the sensor as well as those that leave the sensor can be detected by a PIR sensor. When an object is in front of an atypical PIR sensor, it emits a HIGH signal, and when there are no objects, it emits a LOW signal. It accomplishes this by detecting IR reflected back into the sensor from an object. As a result, PIRs are popular for security applications because they can detect motionless objects as long as they are in front of the sensor. br>br>It appears that this device only detects motion. It's obvious that when an object moves, the signal can be detected as LOW using simple code that reads the status of the device signal as HGH or LOW. When the signal is HIGH, it means there are no moving objects in the area. br>br>However, the statement above isn't entirely accurate. My oscilloscope showed a very different behavior when I looked at the output signal. When there is no motion in front of the device, it outputs 5V on the signal line; when there is motion, the output is a square wave with the duty cycle (not frequency) adjusted based on the speed of the moving object. If you can decipher the output and convert it to velocity and/or acceleration, this is a fantastic tool. However, this information is not included in the documentation. br>br>Save your money if you intend to use this instead of a PIR. For this price, you can get five PIRs and distribute them throughout a large room. You might also want to include a small Wi-Fi hotspot. To make them wireless, all you need is a Wi-Fi card and a battery, and you won't break the bank. br>br>If you want to improve your security application by being able to detect when an object enters a room as well as when it moves around the room, this sensor in combination with a PIR could be very useful. br>br>If you can decode the output, you might be able to detect the speed of an object using this sensor. I didn't waste any time attempting to solve the problem. That is something I may do at a later time, and if it is possible, the vendor should be able to provide information. br>br>I've mentioned the "front" of this device a few times, but which side is it? The documentation states that the potentiometer is on the back, but the device is most sensitive on the back side, and that the side with the wire should face the objects to be detected later in the documentation. This is consistent, but it appears that this side is less sensitive to movement of objects. So, based on observation, the sensor appears to be on the back of this device, but documentation indicates that it is on the front. Why not label the sensor side as well as the rest of the board? I did discover, however, that this device works well from the front when the back is against a hard surface. br>br>Although documentation is available, it has a number of flaws, the first of which is that it provides a lot of useless information. It explains the sensor's theory but doesn't go into much detail about how the signal is generated. Second, the Arduino and Raspberry Pi examples use the sensor in completely different ways, and the documentation doesn't really explain why. If the sensor can be used in a variety of ways, please describe them. Finally, the Pi example was obviously not tested because it contains a major syntax error that prevents it from compiling. br>br>On the back of the device, there is a switch to change the logic level from 5V to 3V3. This is a great feature to have. You can use a 5V device in 3V3 mode, but 3V3 devices cannot be used in 5V mode. br>br>Is there a conclusion? This is an excellent example of a well-written essay. This is a custom-made sensor with unrivaled motion sensitivity. This sensor may be able to provide even more functionality with the right software.

Elian Baird

| Jan 03, 2021

My only real gripe is that the signal "S" output was wired with green wire. Is this for real? Who uses green for such a thing? Blue, orange, and yellow are the most common colors seen. Green, rather than brown? In my opinion, this was a poor design decision. It's all too easy for someone to mistakenly believe it's supposed to be ground and wire both green and black to ground before realizing their mistake. If you pay attention, it's a minor issue, but I think it's worth noting! br>br>It appears to be well packed, with a standard static bag and a decent plastic clamshell inside. I like the clamshells that come with CQRobot products because they help with shipping protection, unlike many other companies who just throw the module/device/etc into a static bag and hope the bubble envelope protects it. Which it frequently does not, resulting in bent pins and other issues. br>br>The PCB appears to be well made; I'm not judging the layout or anything, but the soldering appears to be nice, components are straight, and there are no obvious poor joints or other issues that are common on cheaper electronics modules. br>br>I love how they include a link to the item's wiki page right in the item description! That's fantastic, because a lot of these businesses require you to email them or contact them through Amazon's "contact seller" methods, which is inconvenient. They don't just give you a link; they give you a wiki page! Again, this is a good score because many only send you a crappy pdf and a text file or something after you ask for it. So far, the documentation availability and delivery have been excellent. br>br>So far, it appears to be performing as expected. I've been using it on a Keyestudio Uno board and haven't encountered any issues. The blue LED on the pictures indicates that the code thresholds have been tripped and motion has been detected according to my parameters. When the amber LED illuminates but the blue does not, it indicates that the sensor detects motion but not enough to meet my code's threshold. br>br>I'd say go for it if you require microwave detection.

Aleah Calderon

| Jun 08, 2021

Without a doubt, this is an excellent breakout board. It has a pre-installed pre-installed pre-installed preinstall The cable is terminated, which is nice, though the pins are female, which isn't ideal for arduino use (but should work fine for a Pi). On the board itself, there are nice power and activity LEDs, which is great for debugging, as well as a sensitivity pot that is clearly labeled in which direction to turn it. br>br>From tinkering with this, it's clear that this thing is extremely sensitive and can see through objects. That's cool, and it makes it more interesting than a PIR sensor, but I'm not sure how useful this would be in a real-world situation. It has the ability to see through walls and in all directions at once. If it was a narrow beam or something, it would be far more useful. To find out, I'll have to conduct additional testing. br>br>However, my main complaint is that, despite the fact that it is well documented, it still has some obvious flaws. It's unclear which side is the "front," and the documentation mentions that it can see through walls and that you should orient it to avoid this, but only provides an illegible drawing and no explanation.

Charley Douglas

| Jan 13, 2021