ESP8266 Community Forum

Hi,

I have powered the ESP-01 with 3 x AAA battery via MCP1700 LDO regulator, I have 1000uf cap and 1uf decoupling cap close to the ESP V and gnd pin and 1000uF at the input of the LDO
It starts up correctly but it cannot wake up from the deep sleep. Using a regulated 3.3V from other source is waking up correctly from deep sleep.

Any thoughts ?

You need to connect GPIO16 to reset for deepsleep to work properly. Since you are using an ESP-01, which does not have GPIO16 routed to the pin header, I assume you failed to do that.
Unless you are willing to solder wires to the chip itself, I suggest you get another ESP module with a header for GPIO16.

lethe wrote:You need to connect GPIO16 to reset for deepsleep to work properly. Since you are using an ESP-01, which does not have GPIO16 routed to the pin header, I assume you failed to do that.
Unless you are willing to solder wires to the chip itself, I suggest you get another ESP module with a header for GPIO16.

GPIO16 is already soldered to RST pin

Do you mean that you added yourself a small wire on your ESP-01 ?
Otherwise, No, it is not connected by default ...