ESP8266 Developer Zone

Re: ADC positive offset on 0V

2017-09-19T23:05:17+08:00

Anything? Our client is asking for answers!

Statistics: Posted by gjump — Tue Sep 19, 2017 11:05 pm

Re: View first unread post

2017-09-15T19:23:44+08:00

Jamartox wrote:
Dont you have the down arrow to the left of the thread title?

Down arrow? I don't think so. What's that for?

Statistics: Posted by gjump — Fri Sep 15, 2017 7:23 pm

View first unread post

2017-09-15T17:40:48+08:00

Dont you have the down arrow to the left of the thread title?

Statistics: Posted by Jamartox — Fri Sep 15, 2017 5:40 pm

Re: ADC positive offset on 0V

2017-09-14T21:36:47+08:00

@ESP_Faye
Things i've tried:
Switched the ESPs between boards to to be sure that isn't the circuit, the problem followed the ESPs.
Wrote a simple code using system_adc_read_fast(), wifi off and got the same result, with the ADC pin grounded it reads 10-12 points.
Yesterday I've built 3 more boards, 2 ok and 1 with this offset. I have now 3 with offset and 4 working.

Don't know what's going on;

Regards,

Statistics: Posted by gjump — Thu Sep 14, 2017 9:36 pm

Re: ADC positive offset on 0V

2017-09-13T03:56:45+08:00

ESP_Faye wrote:
Hi,

Could you have a try with the latest ESP8266_NONOS_SDK?

Thanks for your interest in ESP8266!

Faye, same problem, same offset. I'll try on more boards, but I got 50% working and 50% with this problem and I'm always checking the voltage at the pin with a calibrated equipment to be sure.
Any thoughts?

Regards,

Statistics: Posted by gjump — Wed Sep 13, 2017 3:56 am

Re: ADC positive offset on 0V

2017-09-12T23:48:58+08:00

ESP_Faye wrote:
Hi,

Could you have a try with the latest ESP8266_NONOS_SDK?

Thanks for your interest in ESP8266!

Going to try that.

Statistics: Posted by gjump — Tue Sep 12, 2017 11:48 pm

Re: ADC positive offset on 0V

2017-09-12T14:10:56+08:00

Hi,

Could you have a try with the latest ESP8266_NONOS_SDK?

Thanks for your interest in ESP8266!

Statistics: Posted by ESP_Faye — Tue Sep 12, 2017 2:10 pm

ADC positive offset on 0V

2017-09-12T02:10:05+08:00

I'm getting a very annoying problem: I have a project using esp12e and on some boards I got wrong ADC readings(using system_adc_read SDK 2.0.0 NONOS), even when I ground the ADC pin I can read a value ~10mV. I tried to change WiFi modes(all of them) but didn't changed significantly.
Any help is appreciated!

Regards,

Statistics: Posted by gjump — Tue Sep 12, 2017 2:10 am