ESP8266 Developer Zone

Re: Wifi radio not working

2015-03-07T03:38:36+08:00

Yes, I can confirm it's related to the voltage regulator. Somehow, if the voltage is getting unstable the ESP chip becomes in a state it does not connect anymore. Also, if the voltage is to low the regulator will enable the ESP chip but is does not boot and it draws a very large current (200-300mA) and it jams all other near wifi and bluetooth devices (!). I will take a look at it closer with a scope.

Statistics: Posted by systemsconnect — Sat Mar 07, 2015 3:38 am

Re: Wifi radio not working

2015-03-04T21:22:12+08:00

Just thought of one other thing. Are you monitoring the UART serial communications to debug what your code is doing? There is some discussion in another thread about the parameters of deep sleep being reset to default under certain conditions. I have no idea if this might apply to your situation, but the thread is
Re: 【BETA】esp_iot_sdk_v0.9.6_b1 released ！

Scott

Statistics: Posted by ScottR — Wed Mar 04, 2015 9:22 pm

Re: Wifi radio not working

2015-03-04T21:18:05+08:00

I had a similar problem where after a while it would simply stop connecting to my network. I found that it was related to the power supply I used at the time of flashing the chip. I used a more robust, stable power supply during flashing the chip and my connectivity issues went away. I do not know anything about your firmware obviously, nor am I an experienced programmer (but spending a lot of time these days learning about this chip). I am simply making small modifications to the IoT_Demo code and I noticed it is absolutely critical to have a very stable power supply during flashing the chip.

From what I can see, the parameters for the network login get stored in the memory area programmed by the file blank.bin. Whenever I have issues with network login I simply re-flash blank.bin (clear out the garbage). But I haven't had any issues since using a high quality power supply during flashing.

Hope this helps.

Scott.

Statistics: Posted by ScottR — Wed Mar 04, 2015 9:18 pm

Re: Wifi radio not working

2015-02-25T01:16:23+08:00

The problem still exists! So it's not related to the flash memory addresses.
Somehow it stops connecting to wifi after a short while.

Statistics: Posted by systemsconnect — Wed Feb 25, 2015 1:16 am

Re: Wifi radio not working

2015-02-24T17:17:13+08:00

Strangely, the firmware is not writing to flash. I don't know why these addresses get corrupted. It's strange why are they affected after running a while and not from the first run? Apparently, somehow the firmware makes something corrupt during runtime.

Statistics: Posted by systemsconnect — Tue Feb 24, 2015 5:17 pm

Re: ADC damages Wifi radio?

2015-02-21T01:51:51+08:00

Well I guess your firmware is writing to flash? You should make sure it does not touch flash blocks 7c to 7f.

Statistics: Posted by joostn — Sat Feb 21, 2015 1:51 am

Re: ADC damages Wifi radio?

2015-02-20T23:41:07+08:00

OK, that works! Many thanks. It does somehow get corrupted, what's wrong with my firmware?

Please, can you explain why these address get corrupted and why did you think this address causes the problem?

Statistics: Posted by systemsconnect — Fri Feb 20, 2015 11:41 pm

Re: ADC damages Wifi radio?

2015-02-20T17:24:22+08:00

Perhaps your firmware is somehow corrupting the flash configuration area used by the ESP libs (flash blocks 7C - 7F)?
You might try erasing those blocks and filling with zeros.

Statistics: Posted by joostn — Fri Feb 20, 2015 5:24 pm

Re: ADC damages Wifi radio?

2015-02-19T21:30:31+08:00

OK, it does seems not related to the ADC. A new test run did face the same problem and does not use the ADC.
I don't know what te problem is.

Statistics: Posted by systemsconnect — Thu Feb 19, 2015 9:30 pm

Re: ADC damages Wifi radio?

2015-02-18T23:11:40+08:00

OK, I've tried option 0 but still it does not connect. I don't understand why it should working in the first hours and just stops after a while. I've tried multiple ESP chips.
If the ADC is not connected it's perfectly working all the time so the firmware seems OK.

Statistics: Posted by systemsconnect — Wed Feb 18, 2015 11:11 pm

Re: ADC damages Wifi radio?

2015-02-18T21:03:34+08:00

what about others options? maybe (0) ?
maybe some bug, and RF is not calibrated ?

Statistics: Posted by reaper7 — Wed Feb 18, 2015 9:03 pm

Re: ADC damages Wifi radio?

2015-02-18T20:49:11+08:00

Thanks for your answer, but I'm already calling deep_sleep_set_option(1) before deep sleep. This does not solve the problem.

Statistics: Posted by systemsconnect — Wed Feb 18, 2015 8:49 pm

Re: ADC damages Wifi radio?

2015-02-18T20:07:16+08:00

maybe try to set for a tests:

Code:

deep_sleep_set_option(1)

RF_CAL after deep-sleep wake up, there will be large current.

before execute system_deep_sleep

Statistics: Posted by reaper7 — Wed Feb 18, 2015 8:07 pm

Wifi radio not working

2015-02-24T17:12:57+08:00

Hi,

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?

Statistics: Posted by systemsconnect — Wed Feb 18, 2015 6:58 pm