Comments on: Designing the ESP32 Dev Board I always wanted https://blog.squix.org/2020/01/designing-the-esp32-dev-board-i-always-wanted.html Sun, 14 Feb 2021 07:52:24 +0000 hourly 1 https://wordpress.org/?v=6.5.8 By: squix78 https://blog.squix.org/2020/01/designing-the-esp32-dev-board-i-always-wanted.html#comment-9930 Sun, 14 Feb 2021 07:52:24 +0000 https://blog.squix.org/?p=4677#comment-9930 In reply to Dan-Catalin.

Hi Dan-Catalin
Yes, that’s correct. We led out all pins available on the Wrover module, actually rather too many. In hindsight leading out the pins used by the flash chip (GPIO6-11) was rather useless… Do you have any special interest in those pins? How would your perfect board look like?

KR, Dani

]]> By: Dan-Catalin https://blog.squix.org/2020/01/designing-the-esp32-dev-board-i-always-wanted.html#comment-9929 Sat, 13 Feb 2021 21:57:37 +0000 https://blog.squix.org/?p=4677#comment-9929 Hi Daniel,

Why the GPIO 16 and 17 are missing? Are not available from the Wroom or it is a design intend? I need the board to connect to other devices GPS and NB-IoT over serial interfaces. Do you have any suggestion?

]]> By: squix78 https://blog.squix.org/2020/01/designing-the-esp32-dev-board-i-always-wanted.html#comment-9817 Thu, 30 Jan 2020 15:34:08 +0000 https://blog.squix.org/?p=4677#comment-9817 In reply to Vincent Himpe.

Wow, the TPS6205x is indeed impressive. Never too late to learn something.

Thank you, Vincent

]]> By: Vincent Himpe https://blog.squix.org/2020/01/designing-the-esp32-dev-board-i-always-wanted.html#comment-9816 Thu, 30 Jan 2020 15:30:27 +0000 https://blog.squix.org/?p=4677#comment-9816 In reply to Francis Ak’enamé (@SithElephant).

Not really. There’s many out there that can do it. TPS6205x series for example. 5uA standby current and 12uA quiescent , which is better than that TS9013..
This opens up powering from Lithium batteries… If the battery goes down to 3.3 volt these devices become a simple ‘on-switch’ passing the battery voltage.

]]> By: squix78 https://blog.squix.org/2020/01/designing-the-esp32-dev-board-i-always-wanted.html#comment-9815 Thu, 30 Jan 2020 14:48:11 +0000 https://blog.squix.org/?p=4677#comment-9815 In reply to Urs Eppenberger.

Hi Urs!
I think 3 AA or AAA type cells would be a good fit. The VIN pin should be used for this. I plan to also do a LiPo version with a charger. The ESP32 has 16 ADC channels and with the proper settings they can accept voltages of up to 3V. That being said you’ll have to use a voltage divider to measure the voltage.

]]> By: Urs Eppenberger https://blog.squix.org/2020/01/designing-the-esp32-dev-board-i-always-wanted.html#comment-9814 Thu, 30 Jan 2020 13:55:18 +0000 https://blog.squix.org/?p=4677#comment-9814 Interesting board. Many thanks.
Do you have any recommendations about powering the board with a battery:
– which battery type, which pins
– how to measure battery voltage, to send this information to a central device monitoring application

]]> By: Francis Ak'enamé (@SithElephant) https://blog.squix.org/2020/01/designing-the-esp32-dev-board-i-always-wanted.html#comment-9813 Wed, 29 Jan 2020 20:35:56 +0000 https://blog.squix.org/?p=4677#comment-9813 In reply to Vincent Himpe.

Many SMPS get problematic if you actually want to keep a supply current at near 25uA.

]]> By: Vincent Himpe https://blog.squix.org/2020/01/designing-the-esp32-dev-board-i-always-wanted.html#comment-9812 Wed, 29 Jan 2020 20:11:08 +0000 https://blog.squix.org/?p=4677#comment-9812 In reply to Vincent Himpe.

you should also remove the copper plane on the two stubs next to the antenna section.

]]> By: Vincent Himpe https://blog.squix.org/2020/01/designing-the-esp32-dev-board-i-always-wanted.html#comment-9811 Wed, 29 Jan 2020 20:10:08 +0000 https://blog.squix.org/?p=4677#comment-9811 why an LDO ? That is a waste of power. Especially when battery powered.

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