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by loboris
Tue Jan 15, 2019 8:53 pm
Forum: ESP32 IDF
Topic: SPI: received data shifted by 1bit right
Replies: 1
Views: 70

Re: SPI: received data shifted by 1bit right

Maybe you are using the wrong SPI mode. Try with mode 0.
by loboris
Mon Jan 14, 2019 10:47 am
Forum: General Discussion
Topic: running ESP32-D2WD at 240 MHz ??
Replies: 3
Views: 168

Re: running ESP32-D2WD at 240 MHz ??

Why not use ESP32-PICO-D4? It is only slightly larger (7x7mm), but you can save some space because of the components integrated on it.

ESP32 always executes code from SPI-Flash (some code is transfered to IRAM).
by loboris
Sat Jan 05, 2019 6:01 pm
Forum: Hardware
Topic: GPIO0 connected to GND makes the esp32 enter download mode
Replies: 2
Views: 158

Re: GPIO0 connected to GND makes the esp32 enter download mode

GPIO0 must be high on reset not to enter the bootloader mode, after booting you can use it as any GPIO.
Why is it held low and how is it driving SSR, via transistor or directly?
You should put a pull-up resistor on GPIO0 so that it is in high state during reset.
by loboris
Sun Dec 30, 2018 10:17 am
Forum: Hardware
Topic: ESP-Wroom-32 powering
Replies: 5
Views: 375

Re: ESP-Wroom-32 powering

You can start with a step-down module like this one.
I've used it and it works very good, I don't think you have to worry about noise emission.
Later, if you make your own PCB, you can integrate the circuit on it, the chip used is MP2315.

Image
by loboris
Sat Dec 29, 2018 12:55 am
Forum: Hardware
Topic: New board with WROVER doesn't produce WiFi network - is 16MB flash empty?
Replies: 4
Views: 270

Re: New board with WROVER doesn't produce WiFi network - is 16MB flash empty?

Not only it wouldn't make much sense selling the modules with some preprogrammed demo application (wich will be erased by the user anyway), the price (time) to flash the application on milions of modules would make them much more expensive.
by loboris
Fri Dec 28, 2018 9:23 pm
Forum: Hardware
Topic: ESP-Wroom-32 powering
Replies: 5
Views: 375

Re: ESP-Wroom-32 powering

Use switching instead of linear regulator :!:

You are building a commercial project and have to ask about how to power it !? :o
by loboris
Fri Dec 28, 2018 9:18 pm
Forum: Hardware
Topic: New board with WROVER doesn't produce WiFi network - is 16MB flash empty?
Replies: 4
Views: 270

Re: New board with WROVER doesn't produce WiFi network - is 16MB flash empty?

All WROOM and WROWER modules I've ever bought came with empty (erased) Flash, no firmware loaded.
Some sellers or board manufacturers may preload some firmware, but this should not be the case with bare WROOM/WROVER modules, no metter if it is 4,8 or 16MB.
by loboris
Thu Dec 27, 2018 9:40 am
Forum: ESP32 IDF
Topic: Is SPIFFS limited in size?
Replies: 3
Views: 225

Re: Is SPIFFS limited in size?

I've used 14 MB SPIFFS (on WROVER with 16MB Flash) without issues.
by loboris
Mon Dec 24, 2018 9:52 am
Forum: ESP32 IDF
Topic: SPIFFS performance too bad?
Replies: 6
Views: 322

Re: SPIFFS performance too bad?

This is definitely not normal.
Opening the file and reading should be quite fast (< 1ms per 4K block). Writing can be slow, as the sector has to be erased and that can take ~100 ms.
by loboris
Mon Dec 24, 2018 9:42 am
Forum: Hardware
Topic: esp-wroom-32 deep sleep current
Replies: 3
Views: 341

Re: esp-wroom-32 deep sleep current

ESP-WROOM32 should have only 5 uA current in deepsleep.
How are you powering it?

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