ESP8266 Community Forum

Hi all,

Another newbie in need of help here. I built a weather station based on this schematic:



The full instuctable is here:


Instead of nodemcu I used ESP-12E: and a break board


It runs in deep sleep mode (RESET connected to GPIO16) and wakes up every minute to send the sensor readings to ThingSpeak.

I put it inside a solar light like this one and it is power by its 1200mAh 4v battery

Everything works fine but after a couple of hours it stops.

Here is some charts from ThingSpeak that show the measured temperature and the battery level:

Temperature (C)

Battery level

Initially I suspected it was drawing too much current but this is not the case - the battery is not discharged.

I think it is just unstable and cannot wake up from deep sleep at some point. Are there any additional pins that I have to wire to VCC or GND?

For example according this GPIO 0 should be LOW during flashing and HIGH when running. I do not have this connected to anything:



If it has to be connected to VCC do I need a resistor?

Hi,
I made something similar from ESP-01, BME-280 (so only temp, hum, press), HT7333 and old LiIon cells.
It is running for over 1/2 year now with one recharge with a reading every 15' ... several reboots and even a change of WiFi-router didn't bring it to a halt (no values to TS, but no restart of ESP needed).

TS-public view

you can see that it is still in "project" status w/o any case and on breadboard, no extra parts on ESP except 1k from gpio16 to rst and 1k for chpd to Vcc. Pullups for gpio0/2 are integrated on bme280 breakout.
No need for pullup on rst (since connected via 1k to gpio16)

No need for pullup on rst (since connected via 1k to gpio16)

It is a good practice to have one, because GPIO16 is HIGH only during deepSleep() and LOW during WakeUP, the rest of the time, it is left High-Z.

I can tell I had same problem with my project...My case was very easy to find and fix and similar behavior like yours, fine work sending TCP for about 0.5-1 hour and then stops sending.

I did run it on serial adapter and was waiting for moment when it stops sending(about half-1h),
at this point when stopped working I got exception number 3

exception list :
https://github.com/esp8266/Arduino/blob ... _causes.md

Which means "Processor internal physical address or data error during load or store"

So I have looked in my code and found bug where I was using free() on none allocated memory space with malloc ,

my fix was :

this fixed the issue.