OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › sprinklers_pi – An alternative sprinkler control program › Re: Re: sprinklers_pi – An alternative sprinkler control program March 12, 2014 at 8:10 am #25069 LeighGrParticipant @QMan wrote: Here is how you tell OpenSprinkler that you have an Extension board: This is not the case for Richard’s alternative sprinkler control program. AFAIK, this only supports one expansion board, and does work, as I’m using 13 of the available 15 zones.