It seems our divider circuit connected to the ADC of the ESP8266ex has damaged the wifi radio. Our configuration is running at 10 seconds deep sleep interval and after waking up, the voltage of the battery is read from the ADC, wifi connects and sends the data over wifi and sleeps again.
The supply voltage has a maximum of 3.6V. To the ADC a divider circuit brings down the voltage lower than 1V. The divider circuit resistors R1 is 10MOhm a R2 is 2.7MOhm. The divider circuit is directly connected to the battery positive and ground.
Somehow, after running a couple of hours fine, the wifi fails to connect and it will never connect again (even after a power off and on).
I've tested multiple chips and all of them seems to be broken after a while. Everything else still works, so it does wakeup and goes to sleep again but it does not connect to wifi anymore. After flashing the firmware again it still does not connect. If I take an other ESP8266 chip with the same firmware it works.
Has somebody any idea what the problem could be?
If the ADC is not connected it's perfectly working all the time so the firmware seems OK.
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