Is my Schematic Ok?

MCUism
Posts: 51
Joined: Mon Jul 15, 2019 9:25 am

Is my Schematic Ok?

Postby MCUism » Sat May 09, 2020 11:54 pm

Hello guys,

I have developed a design with purely Espressif products and I attached the schematic in the attachments.
review_schematic.png
review_schematic.png (160.86 KiB) Viewed 1187 times


Hence I need thoughts on following things

1. Is my Rx and Tx toggling LED's connections are correct?

2. As I made voltage coming from USB as the common power source, will it be able to drive the whole circuit on the board? (This is my major concern) Please let me know.

3. The Io0 and EN toggling circuit is correct? I made this in order to automatically upload the code into ESP32-Wroom instead of pressing EN and BOOT buttons.

Please give me suggestions and do correct me in case I made any wrongs. Suggestions are much much appreciated. Thanks in advance guys...!!

ESP_Sprite
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Re: Is my Schematic Ok?

Postby ESP_Sprite » Sun May 10, 2020 12:45 pm

So you have locations for an ESP32 and two ESP8266 boards? Are those all powered at the same time? If so, you'll likely overrun the 500mA limit on USB...

MCUism
Posts: 51
Joined: Mon Jul 15, 2019 9:25 am

Re: Is my Schematic Ok?

Postby MCUism » Sun May 10, 2020 12:51 pm

ESP_Sprite wrote:
Sun May 10, 2020 12:45 pm
So you have locations for an ESP32 and two ESP8266 boards? Are those all powered at the same time? If so, you'll likely overrun the 500mA limit on USB...
Firsly thank you so much for the reply.
Yes, all are powered at the same time. Oh I see, so there will be a problem with my computer's USB port right?. What if I power the board with a battery bank? They can handle that right?

ESP_Sprite
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Re: Is my Schematic Ok?

Postby ESP_Sprite » Sun May 10, 2020 12:56 pm

It entirely depends on the battery bank, as well as the rest of the hardware (USB cables etc). Can't say for sure.

MCUism
Posts: 51
Joined: Mon Jul 15, 2019 9:25 am

Re: Is my Schematic Ok?

Postby MCUism » Sun May 10, 2020 1:03 pm

ESP_Sprite wrote:
Sun May 10, 2020 12:56 pm
It entirely depends on the battery bank, as well as the rest of the hardware (USB cables etc). Can't say for sure.
I see. What if I power the ESP01's separately from a different USB and ESP32 from a different USB. Will that be okay ESP_Sprite?

ESP_Sprite
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Re: Is my Schematic Ok?

Postby ESP_Sprite » Sun May 10, 2020 1:31 pm

That probably works... I don't know the power use of the ESP8266 off the top of my head, but I think you may be able to power two off an USB connector.

Alternatively, you could try using a buck-converter instead of the LDO. Plugging in all the 3 ESPs will probably still overload a 500mA PC USB port, but you should be fine is you use a power bank that can deliver 1A.

MCUism
Posts: 51
Joined: Mon Jul 15, 2019 9:25 am

Re: Is my Schematic Ok?

Postby MCUism » Sun May 10, 2020 2:16 pm

ESP_Sprite wrote:
Sun May 10, 2020 1:31 pm
That probably works... I don't know the power use of the ESP8266 off the top of my head, but I think you may be able to power two off an USB connector.

Alternatively, you could try using a buck-converter instead of the LDO. Plugging in all the 3 ESPs will probably still overload a 500mA PC USB port, but you should be fine is you use a power bank that can deliver 1A.
Thanks for the suggestion. The voltage regulator that I'm using in able to supply 1A which is good, Can I know the reason why exactly you are suggesting to have a buck converter.

ESP_Sprite
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Re: Is my Schematic Ok?

Postby ESP_Sprite » Mon May 11, 2020 12:50 pm

Because it's more efficient. LDOs piss the difference between 5V and 3.3V away as heat, buck converters won't.

MCUism
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Joined: Mon Jul 15, 2019 9:25 am

Re: Is my Schematic Ok?

Postby MCUism » Mon May 11, 2020 7:40 pm

ESP_Sprite wrote:
Mon May 11, 2020 12:50 pm
Because it's more efficient. LDOs piss the difference between 5V and 3.3V away as heat, buck converters won't.
I see. Can you suggest any good SMD Buck converter for my application? I know Texas instruments have some...but I really don't know what parameters I should look at while choosing an Buck converter.

ESP_Sprite
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Re: Is my Schematic Ok?

Postby ESP_Sprite » Tue May 12, 2020 7:58 am

Sorry, not off the top of my head.

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