OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › Who accept a challenge to write plugin with soil moisture? › Re: Re: Who accept a challenge to write plugin with soil moistur
Dan in CA
With RS-485 you can have up to 32 nodes on a single cable. I am looking at using Arduino micro controllers at the nodes. you could have say, 4 sensors at each node at different soil depths. That would give you up to 128 individually addressable sensors per cable.
I purchased some MAX487CPA transceiver chips from Mouser for ~$2.00 ea. There is already software available on the internet to make it work. All I need is some spare time…