I’m involve in a project where I need to read sensors in a maximun distance of 100 meters. I have seen other posts and main posibilities are:
Consider using RS485 an arduino as master, and sensors plugged to an inexpensive microcontroller ATTiny to read the sensor, but I saw that RS485 has a limit of devices connected (32?) a need 100 or so. And it would be nice if I could plugged the sensor directly to RS485 but if the sensor should have a microcontroller inside or something
Consider other protocol?
Consider wireless communication, but to me that is not an option as I need to make it consumption efficient.
Do you think I am in the right direction using RS485? Do you know any other protocolo I could take into account?
Thank you very much in advance.