Two ESP8266s and an Arduino?

good morning,

i'm getting started arduino , esp8266, have ambitious project i'd appreciate with.

as understand it, acting wifi arduino, esp8266 module can programmed run simple code (using arduino bridge) , has single, digital i/o pin can attached sensor or button. correct?

if that's case, i'd have esp8266 attached rain sensor , esp8266 attached arduino uno has relay shield attached. once there enough rain max out digital pin (i realise won't have ability set rain trigger level input digital, not analogue), esp8266 send message esp8266 equipped arduino , make activate relays in specific sequence - i.e. close set of windows?

is possible? can esp8266's made communicate directly or require router?

all appreciated!

an esp8266 in nodemcu format has multiple pins.  can use tipping bucket digital pulses of rain quantity.  higher frequency harder rain, total counts per hour or day amount of rain.

then have wifi alert phone

and have pins send out signals sprinkler.
and have pins left on recording light level
and have pins left on data logging this.

are using pins , need more pins ?   one esp can control greenhouse of dozen sensors , dozen relays sprinklers.

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