ESP8266 Community Forum

- Sat Aug 08, 2020 6:40 am #88234 I sometimes have the problem, that it doesn't wake up from deep sleep. Currently I have that effect and plugged in the device to my computer.

Is there any way to further analyze this in the serial monitor?

Battery should be enough, about 90% power left (4000mAh LiPo battery)

- Sat Aug 08, 2020 1:04 pm #88237 More detail required.

Timed deep sleep or external wake up?

How have you wired for deep sleep?

Code used?

- Sun Aug 09, 2020 10:57 am #88252 Hi

How does your GPIO 0 and 2 are connected?
According to https://www.codeproject.com/articles/1152971/running-a-standalone-esp-and-returning-from-deep :
"The GPIO0 and GPIO2 should be connected to VCC with a 4.7k resistor in the middle. This is to prevent a so-called 'zombie-mode', in which the ESP8266-12 has trouble waking up from deep sleep."