Search found 11 matches

by brown_x
Wed Oct 23, 2019 7:20 am
Forum: ESP-IDF
Topic: Building and running a module beyond the original image file
Replies: 12
Views: 5966

Re: Building and running a module beyond the original image file

Any news on this?
It was more than a year ago, wondering if that opensource code is available now or not :)
by brown_x
Fri Oct 11, 2019 11:15 am
Forum: Report Bugs
Topic: new operator kills logging
Replies: 0
Views: 1540

new operator kills logging

Noticed the issue with the esp-iot-solution/lvgl_example but might be overall issue - anyone knows a fix would be nice. I am afraid of a stack corruption or something since the log stops working in a new operator calling parent constructor and than child one. Parent is working ok, child constructor ...
by brown_x
Thu Jan 04, 2018 12:33 pm
Forum: Hardware
Topic: ESP32 ADC Calibration curves?
Replies: 17
Views: 14800

Re: ESP32 ADC Calibration curves?

As far as I understand: 1. we have to route the vref to a gpio internally 2. measure it manually 3. save that value somewhere and replace the #define V_REF 1100 with the saved value This is kinda produces unexpected steps in factory process and it is bad too since we already used all the GPIO's, con...
by brown_x
Wed Dec 06, 2017 10:49 am
Forum: Hardware
Topic: ESP32 ADC Calibration curves?
Replies: 17
Views: 14800

Re: ESP32 ADC Calibration curves?

Any update on this?
by brown_x
Wed Jul 12, 2017 10:17 am
Forum: Hardware
Topic: ESP32 ADC Calibration curves?
Replies: 17
Views: 14800

Re: ESP32 ADC Calibration curves?

The method seems to be fine.

The handlig of new chip/old chip is something we will need to take care - either ask for new batch, either do the calibration during our factory process I guess.

Ty for the feedback and we are waiting the new version.
by brown_x
Wed Jul 12, 2017 7:42 am
Forum: Hardware
Topic: ESP32 ADC Calibration curves?
Replies: 17
Views: 14800

Re: ESP32 ADC Calibration curves?

I really hope I'll get a feedback soon from Espressif since I need to know if I can use it for analog sensors (I can't use i2c sensors unless I use external AD but that will rise the price of the product which might push me towards another controller). It's not a problem if it is not linear, even if...
by brown_x
Thu Jul 06, 2017 10:31 am
Forum: Hardware
Topic: ESP32 ADC Calibration curves?
Replies: 17
Views: 14800

Re: ESP32 ADC Calibration curves?

Tested the formula for ADC digital value 1476, the voltage applied is 1.23V (measured with a multimeter). If I use the formula from Your screenshot y=1.0052x+169.41 the resulting value will be 1653.09 mV. Which is way off from 1.23V ... Did I identified wrong y being the voltage, x the digital read ...
by brown_x
Mon Jul 03, 2017 12:59 pm
Forum: Hardware
Topic: ESP32 ADC Calibration curves?
Replies: 17
Views: 14800

Re: ESP32 ADC Calibration curves?

Any ~date for the 3.0 release? Or is not known yet?
by brown_x
Mon Jul 03, 2017 8:22 am
Forum: Hardware
Topic: ESP32 ADC Calibration curves?
Replies: 17
Views: 14800

ESP32 ADC Calibration curves?

Is there anything new about ADC calibration curves? I need an ADC what works - the current raw value is dangling around but much worst is that I don't really know the maximum Voltage to which the ADC gives back 4095 on -11Db attenuation and neither how I can match the inner values to real voltages. ...
by brown_x
Fri Apr 21, 2017 11:05 am
Forum: ESP32 Arduino
Topic: Real ADC max sample rate?
Replies: 0
Views: 3603

Real ADC max sample rate?

I am interested in the ESP32's ADC maximum sample rate - I did search on this forum and found 6Khz, than on other one 100Khz.

Question is: what is the real rate when timer is on maximum? I could not find too much doc about the SAR ADC to know how many cycles it needs to make a complete conversion ...

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