I'd consider myself new to Arduino since the last project I did was 12 years ago lol.
I'm starting this project (where I think Arduino would be my only choice) where I need to create a proximity sensor alarm. It's a hatch that is locked after working hours (actually several of them) that I need to secure it by adding an inductive proximity sensor to detect when the hatch opens and automatically sends a text message to specific numbers.
I would need guidance on which Arduino to choose and have been suggested SIM800L to use for data. I will buy couple of sensors for testing purposes.
Checked the forum and found codes that I will be using, and this would be pretty basic stuff.
Thank you all in advance and apologies if done anything wrong xD
There are lots of sensors to chose from out there...
The hall effect sensors on my laser trigger to any Ferris material within it's range... the reed switch with a magnet and even optical sensors are used for this...
How you intend to implement it will help you isolate the right sensor... You generally don't want 'wires' going to the door, so you have a metal plate or magnet on the door ... ?
Many of the hall sensors (active sensors) require a supply voltage, that adds at least another wire to the bundle...
Some sensors have a limited distance from the computer that needs to be taken into consideration.
I have many options including old laptop power supplies that I have many on stock or some 5v/5a small power supplies. Would need to run from main hence the converters. Battery backup may be added later.
Optical is a no go as this setup will be used on tower cranes. It's outside and I don't want any false positive.
I have the freedom to do whatever I want as long as I get the best results. Can drill holes so magnets can be attached or anything that comes in mind. Inductive was the first thing that came across my mind the hole hatch is made of metal so that makes things easier. Will a run wire all the way down to the hatch from the crane cabin. Power is not an issue, and I can find/use whatever suits the project.
All will be enclosed in a waterproof box (the smaller the better) out of reach of intruders. We have CCTV in place but that's not enough. A notification of the event is a must.
The wire will be inside the metal rails of the crane. They would have to use a power tool to do that and 99% of intruders are some crazy guys who are willing to break in the site and climb the crane to take some pictures OR jump with a parachute....
I'm redesigning the hatch to hide the box in the best way possible. If Arduino nano is a possibility, I could hide that as well inside the metal frames.
I'll post pictures as soon as possible to help you get a better idea .
