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“We all know how versatile the ESP8266-01 is. By “we”, of course I mean the 6 people that are still reading this after seeing the title! Sure, it does have its limitations: only 2 GPIOs; no analog GPIO; inability to use the ESP.deepSleep() function; We’ve looked at getting more GPIOs before here. We’ll look at analog options another time. But in this Instructable, we’ll deal with the Deep Sleep issue.”

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