I need some help with a RFID project that I would like to start.
My wonderful wife has 2 Chihuahuas and for the most part the miserable little creatures and I have been able to maintain a fairly amiable coexistence but they cause some trouble. They are sneaky, and and they sneak off when no one is looking and do things ... naughty things.
So far I have been able to cope with the occasional dog turd showing up behind the couch but last night I discovered something that was the last straw. One of them peed on my 'man chair'. Its a double wide Lazy-Boy recliner and my place of refuge.
This cannot stand, action must be taken.
As I was frantically trying to clean my chair ideas started flowing. The first ideas I came up with concluded with me trying to design a aesthetic splatter shield and how to limit splatter radius so were rejected.
After calming myself a bit, I settled on this Idea.
I want to build a device that does the following.
- Uses a PIR sensor to detect motion
- Uses a RFID tag to identify if the motion detected by the PIR is caused by a evil varmint.
- If the PIR sensor senses movement and there is a RFID tag in range, deploy a evil varmint deterrent.
I want to use 2 methods of detection to prevent as many false triggers as possible. The device will be positioned next to my chair and when the evil varmint shows his furry pointy eared little face, the deterrent is deployed.
I will place the device next to my chair and where it will guard my chair. If this experiment proves successful, I will build multiple devices to place in other locations. Next high priority location will be next to the Christmas tree.
I have used ATtiny microcontrollers with PIR sensors for some Halloween projects and a small device that would light up a pair of led eyes and growl when someone walked by for a little bit of camping fun so I can figure out that part.
My problem is the RFID aspect of it. I have no experience with RFID and am struggling to find the information I need. I want to be able to detect if an RFID tag is in range when the PIR detects motion. Ideally, it needs to detect something in a 3-6ft radius (adjustable if possible). I don’t even care if I can read the RFID info, I just want to know if its close. The RFID info could be used later for targeting specific deterrents for specific pets but right now, I just want to determine if its ‘close’.
Could I get some help figuring out identifying RFID components that could be used for this? The RFID tag can have some size to it as it will be attached to the pet like a dog tag. It needs to be passive because I don’t want to mess with batteries. Something about the size of a quarter and maybe a little thicker would be perfect. I would love to build something but need direction. I don’t want to spend a ton on the RFID and would prefer to keep the RFID stuff under $30. I have everything else I need. (micro controllers \ programmer \ PIR sensor etc).
To be honest, I dont care if its RFID but that was the only thing I could think of that I could attach to the dogs that would allow the device to easily discriminate between movement from a person and movement from a pet.
Oh, my initial deterrent will be the grim reaper seen in this video:
I pick things like these up in after Halloween sales for cheap. They are easy to set up a trigger from a microcontroller when they are in demo mode.
So any help with the RFID or an RFID alternative would be greatly appreciated.