Search found 40 matches

by luisonoff
Fri Dec 14, 2018 9:26 am
Forum: Hardware
Topic: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?
Replies: 14
Views: 17643

Re: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?

This is effiency of TPS62136
Image
Image

From 0.5mA to 2.5A it is above 90%, with a maximum of 96% at 500mA. But at 20uA it is only 40%.
by luisonoff
Fri Dec 14, 2018 9:19 am
Forum: Hardware
Topic: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?
Replies: 14
Views: 17643

Re: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?

XC6203 is a good option, I didn't know about TorexSemi, thanks. Quite SMALL actually (3x3mm plus 2 capacitors) and easier to solder by hand and quite GOOD for deepsleep because dropout and supply current at low output current are very small. BUT bear in mind that it has a maximum output of 400mA, be...
by luisonoff
Fri Dec 14, 2018 8:05 am
Forum: Hardware
Topic: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?
Replies: 14
Views: 17643

Re: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?

I use Texas TPS62136 buck switching converter and I am very happy.
The full solution with caps and resistors needed is a bit large (7x7 or 8x8 mm), but it is extremely efficient, the best option I know of right now. Cost is around 2-3 eur for the entire solution.

Anyone using a better option?
by luisonoff
Thu Nov 29, 2018 10:49 am
Forum: General Discussion
Topic: About ESP32.com and censorship
Replies: 3
Views: 1677

Re: About ESP32.com and censorship

I believe that once the FCC makes that information PUBLICLY available (as it was the case with the information shared by rudi), and considering the FCC is not breaking any NDA of its own (with your client) by releasing it (I hope not), then this information is not protected anymore by your NDA and y...
by luisonoff
Thu Nov 22, 2018 10:10 am
Forum: General Discussion
Topic: esp_http_client_fetch_headers behaviour
Replies: 2
Views: 1517

Re: esp_http_client_fetch_headers behaviour

I think you should report this here: https://github.com/espressif/esp-idf/issues
And could be somehow related to: https://github.com/espressif/esp-idf/issues/2684
by luisonoff
Tue Oct 23, 2018 11:55 am
Forum: ESP-IDF
Topic: ESP32/MPU-9250 losing accuracy
Replies: 4
Views: 1973

Re: ESP32/MPU-9250 losing accuracy

Post code of your SPI driver (if any apart from IDF) and the functions using this SPI driver.
by luisonoff
Tue Oct 02, 2018 7:24 am
Forum: General Discussion
Topic: Encrypted OTA firmware
Replies: 22
Views: 9697

Re: Encrypted OTA firmware

Perhaps we should write up a guide to certificate "best practices" for ESP-IDF & IoT deployments in general. That would be great :). In my devices I am using some intermediate certificates I downloaded from somewhere, but not sure what servers they support, or how long they will be valid, or if one...
by luisonoff
Wed Sep 19, 2018 7:29 am
Forum: ESP-IDF
Topic: ESP32 IDF on Atom.io - full integration w/ ESP32-IDF on one package.
Replies: 2
Views: 2254

Re: ESP32 IDF on Atom.io - full integration w/ ESP32-IDF on one package.

Hello, Have you seen this other topic with tutorial? https://esp32.com/viewtopic.php?f=13&t=6383 Why are you not using newer CMake? Seems that is going to be the default option very soon. What is the difference between Atom.io and VSC? I understand from your post that you made an all-in-one IDE base...
by luisonoff
Thu Sep 06, 2018 10:45 am
Forum: ESP-IDF
Topic: Question about SPIRAM documentation
Replies: 0
Views: 865

Question about SPIRAM documentation

Hello, I found something missleading at the documentation. At the end of "Support for external RAM" section in "ESP-IDF Programming Guide", at "Chip revisions": ESP-IDF also takes other measures to make sure no combination of PSRAM access plus the offending instruction sets are used: it links to a v...
by luisonoff
Thu Aug 30, 2018 6:35 am
Forum: ESP-IDF
Topic: Serial Flashing factory and OTA
Replies: 3
Views: 1888

Re: Serial Flashing factory and OTA

Thank you Chegewara!
I didn't know about this tool, very handy!
I wish it could also read flash contents into bin file, in order to get actual state of ota_data partition, etc. But as you mentioned I may be able to do everything using esptool.py

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