I was testing the deep sleep mode featured in the ESP8266.
I have a simple USB battery power supply associated with a 3.3V power regulator (https://www.adafruit.com/product/2165).
Everything is fine, I have a low current in the deep sleep mode.
Then I tried to power the thing with two 1.5V AA cells and eveything got messed up: my ESP keep restarting (led blinking). I both tried the ESP-01 and Huzzah from Adafruit.
I noticed two things:
(1) Input voltage drops at 2.8V when ESP is on.
(2) Input current raises over 130mA (compared to 70mA with the USB battery).
My conclusion would be that the voltage being too low, the chip trie desperately to power up at full throttle, .. and fails then reboots.
Am I right?
Edit: ESP8266 seems to be able to work ender 3.3V : http://www.esp8266.com/viewtopic.php?p=23790#p23790
What is the solution?
Thanks to you.