Proximity sensing is a very common application in electronics. There are several ways to accomplish this. The most common way is by using a PIR sensor. PIR Sensor senses the change in ambient infrared radiation caused by warm bodies. I have already covered this in my Tutorial No. 5: "PIR Sensor Tutorial - With or Without Arduino". However, since PIR sensors detect movement from living objects, they can generate false alarms. These sensors are also inefficient in hot environments, as they rely on heat signatures. The other common methods of proximity sensing involve, using reflected ultrasonic or light beams. Using these sensors, the intruding object is detected by the reflected beam back to its source. The time delay between transmission and reception is measured to calculate the distance to the object. In this tutorial, we are going to look at another method of proximity sensing using "Microwaves" and "Doppler Effect". In my hand is an inexpensive RCWL-0516 Microwave Radar Motion Sensor. The RCWL-0516 microwave sensor detects "any movement" from "any object" and does not rely on heat, making it more reliable in hot environments. I am going to use this sensor to create a geo-fence around my house to detect motion and get notifications. Video: https://www.youtube.com/watch?v=JOVd3sKEFaI Full Blog Post: http://diy-projects4u.blogspot.com/2023/09/blog-post.html Code: https://github.com/tarantula3/RCWL-0516/blob/main/Code.ino Datasheet: https://github.com/tarantula3/RCWL-0516/blob/main/rcwl-0516-data-sheet.pdf Schema: https://github.com/tarantula3/RCWL-0516/blob/main/rcwl-0516-schematic.png Other Links: PIR Sensor Tutorial - With or Without Arduino: https://www.youtube.com/watch?v=jvGOtvnPU9Q DIY Relay Module: https://www.youtube.com/watch?v=3n69b4sdDjk All About nRF24L01 Modules: https://www.youtube.com/watch?v=LhBIRMMAGGE DIY - NodeMCU Development Board: https://www.youtube.com/watch?v=y2m2nh7wHaY Contactless Wireless Door Bell Using Arduino: https://www.youtube.com/watch?v=DF6Xojd7OvA Doppler Effect: Wikipedia https://en.wikipedia.org/wiki/Doppler_effect Support My Work BTC: 1Hrr83W2zu2hmDcmYqZMhgPQ71oLj5b7v5 LTC: LPh69qxUqaHKYuFPJVJsNQjpBHWK7hZ9TZ DOGE: DEU2Wz3TK95119HMNZv2kpU7PkWbGNs9K3 ETH: 0xD64fb51C74E0206cB6702aB922C765c68B97dCD4 BAT: 0x9D9E77cA360b53cD89cc01dC37A5314C0113FFc3 LBC: bZ8ANEJFsd2MNFfpoxBhtFNPboh7PmD7M2 COS: bnb136ns6lfw4zs5hg4n85vdthaad7hq5m4gtkgf23 Memo: 572187879 BNB: 0xD64fb51C74E0206cB6702aB922C765c68B97dCD4 MATIC: 0xD64fb51C74E0206cB6702aB922C765c68B97dCD4 Thanks, ca gain in my next tutorial. #RCWL0516 #MicrowaveRadarMotionSensor #PIRsensor