Inside a $1 radar motion sensor (10maurycy10.github.io)

Article summary

The article explores the inner workings of a $1 radar motion sensor, which uses a microwave oscillator and super-regenerative receiver to detect movement. The sensor's performance is inconsistent, working well indoors but poorly outdoors due to the lack of static returns. The author also experiments with modifying the sensor to create a bistatic radar setup, which improves its performance. The sensor's technology is compared to other methods, such as Wi-Fi sensing, which can also detect movement and vital signs.

Main themes

• Radar motion sensor technology
• Wi-Fi sensing
• Vital sign detection
• Bistatic radar
• Motion detection
• Sensor modification

What commenters say

• Some commenters discuss the potential of Wi-Fi sensing for detecting movement and vital signs, with applications in fields such as healthcare.
• Others share their experiences with using radar motion sensors and other technologies for presence detection, highlighting the limitations and challenges of these methods.
• There is a debate about the effectiveness of different sensors, including PIR sensors and mmWave sensors, for detecting stationary objects and small movements.
• Some commenters propose alternative solutions, such as using a sensor on a chair or a ceiling sensor, to improve the accuracy of presence detection.
• The discussion also touches on the topic of veganism, with some commenters joking about the ability of sensors to detect veganism, while others point out the limitations of this approach.
• The use of AI and machine learning for analyzing sensor data and detecting vital signs is also mentioned as a potential area of research and development.
• Some commenters share their own projects and experiments with sensor technology, including the use of ESP32 boards and Wi-Fi CSI sensing for detecting movement and presence.
• There is a discussion about the trade-offs between different technologies, including cost, accuracy, and ease of use, when it comes to choosing a sensor for a particular application.