Hi i want to do a project that is needed many arduino than 50+. Fist i want to put arduino(nano or pro mini) in to a mat and through single core wire to provide power to each connected mats. Last i would use esp32 as the master to require data with arduino. The square mat is 30x30 cm that the combined shape is not specific. So i have a question which communication method is better ?
I want to use cheap solution so i think of i2c or rs485(can bus is not cheap) amd NRF24L01, can any one give me some advice ?