Search found 44 matches

by seonroz
Sun Jul 07, 2019 9:58 pm
Forum: General Discussion
Topic: espressif's "Chip7 2-2-A" spotted in the wild
Replies: 52
Views: 7849

Re: espressif's "Chip7 2-2-A" spotted in the wild

I'll have a follow up video out soon with more details and an update on the specs, stay tuned!

Seon
unexpectedmaker.com
by seonroz
Fri Feb 01, 2019 7:43 am
Forum: Hardware
Topic: ESP-WROOM-32 design help for boot + I2C
Replies: 4
Views: 575

Re: ESP-WROOM-32 design help for boot + I2C

Hello, possibly I used wrong picture of ESP-WROOM-32 pinouts, because I have not noticed any warning that I can not use some pins because they are reserved. Now I know it which is good but I am only at half step. Now I am confused and not know for sure which another pins are forbidden too. Can I us...
by seonroz
Fri Feb 01, 2019 7:32 am
Forum: Hardware
Topic: ESP 32 auto reset transistor design
Replies: 3
Views: 681

Re: ESP 32 auto reset transistor design

Kentfielddude wrote:
Fri Feb 01, 2019 5:53 am
Thanks. I've seen some designs using UMH3N dual transistor with 4.7k pre-bias which eliminates the need for the 10k external resistors.
Yup, exactly the same circuit, just all inside the die to save space and component count, though not always cheaper to go that way.
by seonroz
Fri Feb 01, 2019 5:06 am
Forum: Hardware
Topic: ESP 32 auto reset transistor design
Replies: 3
Views: 681

Re: ESP 32 auto reset transistor design

The resistors are just biasing resistors and to drop current between the base and emitter. 10k is a common value for biasing in something like an auto-reset as the transistors isn't being used to amplify current, but just as a signal level switch, so a higher resistor means less saturation on the ba...
by seonroz
Thu Nov 29, 2018 11:12 pm
Forum: General Discussion
Topic: Small ESP32 Modul ( all include in new ESP32-PICO )
Replies: 122
Views: 26448

Re: Small ESP32 Modul ( all include in new ESP32-PICO )

.. I've just sent off a rev6 PCB for manufacturing with 2 final little tweaks, and then TinyPICO is done and I start the journey of "how am I going to manufacture them" ;) Hi Seon well done - i saw you have pSRAM working now on TinyPICO Rev6 relax :) you did it now. best wishes rudi ;-) Thanks rudi...
by seonroz
Thu Nov 29, 2018 10:03 pm
Forum: General Discussion
Topic: About ESP32.com and censorship
Replies: 3
Views: 712

Re: About ESP32.com and censorship

This all sounds reasonable to me... thanks for the openness and honesty about what happened. Clearly no malice involved and the desire to go above and beyond to protect your clients interests is admirable!
by seonroz
Wed Nov 21, 2018 8:32 pm
Forum: General Discussion
Topic: Small ESP32 Modul ( all include in new ESP32-PICO )
Replies: 122
Views: 26448

Re: Small ESP32 Modul ( all include in new ESP32-PICO )

Hi Everyone, I just got back from Shenzhen on Sunday with my rev5 PCBs in hand, so I built one and TADA! PSRAM working like a champ! I'm so glad I got past this little hurdle, and wanted to thank everyone here for your help and support on this Tiny journey ;) rudi made an image from my LiveStream ye...
by seonroz
Wed Nov 07, 2018 6:09 am
Forum: General Discussion
Topic: Small ESP32 Modul ( all include in new ESP32-PICO )
Replies: 122
Views: 26448

Re: Small ESP32 Modul ( all include in new ESP32-PICO )

Ok, I finally got PSRAM working on y PICO-KIT... even using Dupont connecters (I know, a stupid idea) but I only have 1 PICO-KIT and didn't want to solder directly to it. So I am SUPER relieved about that - and big thanks to rudi for all of your info and posting all of your steps. BUT... One thing t...
by seonroz
Sun Nov 04, 2018 9:55 pm
Forum: General Discussion
Topic: Small ESP32 Modul ( all include in new ESP32-PICO )
Replies: 122
Views: 26448

Re: Small ESP32 Modul ( all include in new ESP32-PICO )

rudi ;-) wrote:
detail_pullup.png
Great shot! Thanks rudi!

I might try again today to make a smaller adapter.

Cheers,
by seonroz
Sun Nov 04, 2018 9:44 pm
Forum: General Discussion
Topic: Small ESP32 Modul ( all include in new ESP32-PICO )
Replies: 122
Views: 26448

Re: Small ESP32 Modul ( all include in new ESP32-PICO )

Hey rudi, Can I get a hi-res shot of a close up around the PSRAM? I can't see what you did about 10k pull-up or any decoupling caps. The images you posted are hard to see, thanks :-) Thanks Seon unexpectedmaker.com yes will upload next time the 10k pull up is sitting at the psram in this mod and co...

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