I think the inclusion of a 6LoWpan radio interface would make it such a widely usable solution!

A better approach would be to get a sample lybrary in a .wav formats, convert it down to 8kHz sample rate PCM (10bit or 8bit for speech is enough), and store every sample as a binary array in a header file, with every character having it's own array. This is the way people store character font info ...

After suggesting, I included an audio circuit into the Schematic. First post updated.

To inhibit the voltage I layout jumper pins directly in front of the devC board usb connector with a tall jumper :D . The jumper physically prevents inserting a usb cable but connects internal power when installed. Remove for development. If that is what that rpi circuit is for. https://www.digikey...

Which display you've had in mind for the 50-pin connector? On Buydisplay I couldn't find any matching your 50-pin connector pinuot. I have one of this, and also in it's devboard version. https://www.buydisplay.com/default/serial-spi-3-5-inch-tft-lcd-module-in-320x480-optl-touchscreen-ili9488 https:...

The reason is quite simple: I wanna make this thing as simle as possible, with minimalistic BOM, easy assembly. I don't want to spend more work with this yet until the software is figured out, for which this board is totally enough. Audio was not a key design goal, as (as far as I know) it is pretty...

REV. List: V1.0 - Initial version V1.1 - Updated connector names, added jumper to CON3, added pull-downs to CON2 Pin 35,39, Corrected descriptions here'n'there. V1.2 - Included audio circuit as mentioned in Datasheet of FT81X. So, what a good way to start after switching to KiCAD? Design a board lo...

- I think that having a ports that could drive 1A or more would be awesome No MCU or SoC around the world can provide 1A on GPIOs ! It is up to you to add some MOSFET to drive such current ... - Sleep power modes that have WOR (Wake On Radio) feature. (beside other waking functions) WOR can not be ...

Honestly, I would not use the OPamp in the ESP, rather an external one, or a PIC with a built-in OPamp, which will do the conversion and use either SPI or I2C with the ESP to do the data sharing.

Hello Ahmed, designing with esp-idf you can call "make menuconfig" and set the PA output power, check line 1064 of https://github.com/espressif/esp-idf/blob/master/components/esp32/Kconfig Actually this mentioned section it's not for the OPamp, rather the wifi. I just noticed that the OPa...