Search found 513 matches

by loboris
Sun Dec 30, 2018 10:17 am
Forum: Hardware
Topic: ESP-Wroom-32 powering
Replies: 5
Views: 1523

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: 1099

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: 1523

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: 1099

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: 1703

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: 1573

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: 4
Views: 1426

Re: esp-wroom-32 deep sleep current

ESP-WROOM32 should have only 5 uA current in deepsleep.
How are you powering it?
by loboris
Tue Dec 18, 2018 9:24 am
Forum: General Discussion
Topic: esp_wifi_set_max_tx_power, help with programming guide info
Replies: 6
Views: 1814

Re: esp_wifi_set_max_tx_power, help with programming guide info

As the value range for CONFIG_ESP32_PHY_MAX_WIFI_TX_POWER in menuconfig is 0 - 20, I can only assume the range for esp_wifi_set_max_tx_power() is the same.
It is indeed not clear from the function description and the function source is not available.
by loboris
Mon Dec 17, 2018 10:27 am
Forum: Hardware
Topic: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?
Replies: 14
Views: 7740

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

What solar charge controller IC do you use? No special solar charge controller IC is used, just MP2315 switching regulator providing 6V to the TP5000 battery charger setup for LiFePO4 charging and some additional circuit to disconnect the panel on low voltage. Any panel (or other power source) 6V -...
by loboris
Sun Dec 16, 2018 2:50 pm
Forum: Hardware
Topic: ESP as wireless bridge for forgetful clients
Replies: 2
Views: 871

Re: ESP as wireless bridge for forgetful clients

Isn't it much easier for the client to use his smartphone to manage the email, or connect his PC to the smartphone acting as hotspot (adding the USB wifi adapter shouldn't be the problem)? :?

Go to advanced search