My ESP-32 EVK with sd card,codec and eth

frankie.zeng
Posts: 9
Joined: Mon Aug 21, 2017 12:54 am

My ESP-32 EVK with sd card,codec and eth

Postby frankie.zeng » Mon Aug 21, 2017 1:20 am

it looks like this:
Image
The evk board contains:
1.micro usb +cp2104 (use esptool.py can download the code to flash directly)
2.sd card (4 bits)
3.audio codec (wm8978,with headphone,5w speaker and mic)
4.eth phy(lan8720A)
more infomation:
https://www.whyengineer.com/esp32/

now you can only from taobao(china),if you are a foreigner,maybe you give me a email(frankie.zengfu@gmail.com) ,i will deliver to you.

ESP_igrr
Posts: 850
Joined: Tue Dec 01, 2015 8:37 am

Re: My ESP-32 EVK with sd card,codec and eth

Postby ESP_igrr » Mon Aug 21, 2017 3:25 am

Can you post the board schematic on the Wiki or on Github?

frankie.zeng
Posts: 9
Joined: Mon Aug 21, 2017 12:54 am

Re: My ESP-32 EVK with sd card,codec and eth

Postby frankie.zeng » Mon Aug 21, 2017 4:17 am

here is SCH and PCB. the wiki page.
https://wiki.whyengineer.com/doku.php?id=esp32:index

ESP_igrr
Posts: 850
Joined: Tue Dec 01, 2015 8:37 am

Re: My ESP-32 EVK with sd card,codec and eth

Postby ESP_igrr » Mon Aug 21, 2017 4:30 am

Thanks!
One note on the schematic — you may consider adding a capacitor on the EN line, see 3.1.2.2 in "ESP32 Hardware design guidelines".

(later)
It may also be nice to have all the connectors for cables (USB, Eth, audio) roughly on one side of the board.

frankie.zeng
Posts: 9
Joined: Mon Aug 21, 2017 12:54 am

Re: My ESP-32 EVK with sd card,codec and eth

Postby frankie.zeng » Mon Aug 21, 2017 5:41 am

ESP_igrr wrote:Thanks!
One note on the schematic — you may consider adding a capacitor on the EN line, see 3.1.2.2 in "ESP32 Hardware design guidelines".

(later)
It may also be nice to have all the connectors for cables (USB, Eth, audio) roughly on one side of the board.


yeah,i'm thinking more funning features based on esp32 and the shape will become more beautiful.

frankie.zeng
Posts: 9
Joined: Mon Aug 21, 2017 12:54 am

Re: My ESP-32 EVK with sd card,codec and eth

Postby frankie.zeng » Mon Aug 21, 2017 1:43 pm

use the voltage detect ic can avoild 50M emac clk making the esp32 enter into download mode

ESP_igrr
Posts: 850
Joined: Tue Dec 01, 2015 8:37 am

Re: My ESP-32 EVK with sd card,codec and eth

Postby ESP_igrr » Wed Aug 23, 2017 10:42 am

Please add a pin header for JTAG in the next version! Just realized that I have to go back to flashing over UART with this board...

frankie.zeng
Posts: 9
Joined: Mon Aug 21, 2017 12:54 am

Re: My ESP-32 EVK with sd card,codec and eth

Postby frankie.zeng » Fri Sep 08, 2017 4:14 am

this is simple demo video:
https://youtu.be/XmACCHjvG5k

ESP_igrr
Posts: 850
Joined: Tue Dec 01, 2015 8:37 am

Re: My ESP-32 EVK with sd card,codec and eth

Postby ESP_igrr » Fri Sep 08, 2017 6:46 am

Btw, i was a bit surprised that when i plugged an Ethernet cable into this board, short circuit happened and the regulator became very hot! Looking at the schematics, i see that you have implemented a kind of PoE where 5V can be fed to the board via the Ethernet cable.
However there is no protection for the case when the board is powered by USB and the cable happens to short 5V and GND... That part of the design definitely needs some kind of a protection circuit.

frankie.zeng
Posts: 9
Joined: Mon Aug 21, 2017 12:54 am

Re: My ESP-32 EVK with sd card,codec and eth

Postby frankie.zeng » Wed Sep 20, 2017 5:35 am

a new demo
ble and wifi gateway
https://youtu.be/ViGX7JULN0U

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