I am in the process of making a burglar alarm system. There will be a main box with arduino nano in, that will be connected to the sensors (PIR Ect.) This will be in our back utility room.
I then want a pannel about 10- 20 meters away at the front door that will have an RFID reader and a I2c LCD panel. The plan at the moment is to have another Nano in here. This panel at the front door will send a digital pins out 5v signal back to the main Nano to turn the alarm on or off. The wiring will be the existing burglar alarm wireless installed in the house. 12v will be supplied down the cable to power the Nano at the front door.
Question 1. Will the nano 5v pin out be able to work over that distance?
- Any other better ideas?
I know that I could use a relay either end but I don't really want to have a big relay at the front door. (Maybe transistors?) I am not very experienced so go easy please!