Hi, I am new to arduino and have a project todo: battery powered photoelectric outside application. To be clear: I am thinking of garage door photoelectric type sensor.
For ‘outside’ the device should be outside waterproof and contain a windshield to see the other device. When someone passes thru the sensors, the master device would send a text message.
Please make a recommendation on setup & purchasing recommendations.
My obvious big concern is how to make the batteries last so they would not have to be replaced often; if possible
Thanks for any help or advice, is very appreciated.