Hey guys so I’ve got a uni project to solve a uk based issue I have chosen knife crime.
My idea is to design a knife set which is tracked by a centralised hub in the kitchen this would sound an alarm if the knife left the kitchen.
I’ve been looking at transponders and this thing called ez pass which uses transponders and antennas to detect cars https://auto.howstuffworks.com/e-zpass.htm
I’d need ideally the knives to not need a power source
If anyone can help me figure out what I should be looking into I’d appreciate it a lot I’m pretty new to all this though I do have a good understanding of electronics
How BIG are these knives you refer to?
Paul
Just standard kitchen knives sizes, they would vary in size
One aspect is how to clean those knifes, if any alarm stuff is added, it must sustain the dishing..
harryberry272:
Just standard kitchen knives sizes, they would vary in size
Would you modify existing knives or produce and assemble then yourself?
Paul
To clean them I wanted it all to be housed in a water tight handle, that’s why I didn’t want it to have a battery as that would mean it would need to be opened up, I was thinking of something similar to an nfc tag but a longer range one that would detect it up to a certain point then “disconnect” and the alarm would go off.
And with the assembly I haven’t got the far yet but I’d probably start with a 3D printed prototype
What technology do the shops use when they have attached stuff to expensive clothing starting the alarm when taken out of the shop? I don't think there's any battory in them but the detectors are "special".
Yes that’s another thing I’ve been looking into but they work on the principal that you walk past a detector so could be exploited if they put it through a window as you’d need on at each door.
But maybe that technology could still be used somehow and adapted to going off when it’s stops detecting it, but I’ll have to do some research on their range.
I was wondering if there was any arduino projects that used simulation technology but I’m not sure where to start
So after a quick google they all seem to use the same technology which is rfid and Rf.
So I guess my next step is to see if this is implemented in any existing ardiuno projects as I’m not sure what components I’d need to use
Why is it a problem if a knife leaves the kitchen?
Maybe it would be simpler and cheaper just to have a spare set?
...R
Railroader:
What technology do the shops use when they have attached stuff to expensive clothing starting the alarm when taken out of the shop? I don't think there's any battory in them but the detectors are "special".
Two magnetized metal strips that when shorted together make a resonant circuit that the sensors can detect as a change in the magnetic flux. When the clerk runs the item over the AC magnet, the strips open up and there is no longer a resonant circuit.
Paul
harryberry272:
Yes that’s another thing I’ve been looking into but they work on the principal that you walk past a detector so could be exploited if they put it through a window as you’d need on at each door.
But maybe that technology could still be used somehow and adapted to going off when it’s stops detecting it, but I’ll have to do some research on their range.
I was wondering if there was any arduino projects that used simulation technology but I’m not sure where to start
Ehhh. Maybe You should run a personality check of the people having access to the kitchen. Mounting detectors in several doorways, and windows kills the project.
Robin2:
Why is it a problem if a knife leaves the kitchen?Maybe it would be simpler and cheaper just have a spare set?
...R
Using technology is fun and sometimes the project is to find something to do with that technology...
Robin2:
Why is it a problem if a knife leaves the kitchen?Maybe it would be simpler and cheaper just to have a spare set?
...R
Its not an issue of losing the knives it’s an issue of teenagers stealing them from their kitchen draws and stabbing each other with them. Knife crime is on a massive rise in the uk
Railroader:
Ehhh. Maybe You should run a personality check of the people having access to the kitchen. Mounting detectors in several doorways, and windows kills the project.
Exactly I didn’t want to go down that route as I thought it be easily exploitable, I’m currently looking at using the rf sensors, I’m experimenting with a 13mhz one but I think to get the range I want I’d need a 900mhz one like the car tolls use as I have previously mentioned.
I’m struggling with the code so if anyone would like to give me a hand understanding it I’d appreciate a lot
I might be misunderstanding You but You You sound like almost desperate.
This is not an issue for just "code".
Use highly reliable personal in the kitchen and lock out all other people.
Railroader:
I might be misunderstanding You but You You sound like almost desperate.
This is not an issue for just "code".
Use highly reliable personal in the kitchen and lock out all other people.
I think u do misunderstand this is targeted at a home setting, you can’t just lock ur children out of ur kitchen
So this is your home?
Won't work in anyone else's! 
Your kids must be a bit of a worry! 
harryberry272:
Its not an issue of losing the knives it’s an issue of teenagers stealing them from their kitchen draws and stabbing each other with them. Knife crime is on a massive rise in the uk
Don't let that sort of teenager into your house, never mind into your kitchen.
And if your plan is to equip every UK household with your anti-kitchen-knife-theft system then forget it - think how difficult it has been to get people to comply with Covid restrictions.
...R
Keep the knives behind locked doors, maybe in a safe.