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the wiring diagram is pretty straight forward, sorry for the loong response time, thehardest part would be desoldering the regulator and led from the arduino board
It could be done, you would have to, with a transistor or mosfet, turn the power to the gprs unit off when going to sleep> other than that it would be pretty easy, We could make it happen
About 15 dollars for transmitter and reciever. Without the batteries, although you can use any battery, like alkaline. With D alkalines the weather station will last around 7 years.
Yes, it has already been done, although the esp's quiescent current is higher, and it's deep sleep function is harder to use. But it is more convinient sending the data directly to your phone.
Arduino Ultra Low Power Wea...View Instructable »