The designation typically refers to two common electronic components found in hobbyist and industrial circles: an nRF24L01 wireless module adapter board Go to product viewer dialog for this item. and a humidity/soil moisture sensor relay module . 1. YL-105 nRF24L01 Adapter Board
8-pin socket for direct plug-and-play with the nRF24L01+ module. yl-105 datasheet
Triggering water pumps when soil moisture drops below a set point. Rain Sensing: The designation typically refers to two common electronic