Small ESP32-S2 dev board for handsoldering

Miraculix
Posts: 20
Joined: Wed Sep 16, 2020 9:43 am

Small ESP32-S2 dev board for handsoldering

Postby Miraculix » Wed Jan 06, 2021 10:06 pm

I see only one thread with ESP32-S2 in the Showcase forum, so here's another one.

This is a small breadboard friendly dev board I designed which is compatible with ESP32-S2 WROVER and WROOM. Many pins are not accessible to make it smaller. It includes a MCP1700 or MCP1702 voltage regulator which has a very low quiescent current, so the board only draws 26uA during deep sleep.

For reverse polarity protection it uses a cheap P-Channel MOSFET instead of a diode.

Capacitors and resistor use a 0805 footprint to make it easy to handsolder.

Schematic and PCB design can be accessed here: https://oshwlab.com/Miraculix200/s2-tiny

Image
Image

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lowtolerance
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Location: Virginia Beach, Virginia, United States of America

Re: Small ESP32-S2 dev board for handsoldering

Postby lowtolerance » Mon Feb 15, 2021 2:49 pm

Very nice! I’m working on a couple of esp32-s2-based projects and its astounding how easy (and CHEAP!!) it is to make a custom pcb for these modules. I’m using the new MINI modules for one, and the PCB is only as wide as the module (<17mm), and the BOM for it is less than $2 USD, including the module 😂

chegewara
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Joined: Wed Jun 14, 2017 9:00 pm

Re: Small ESP32-S2 dev board for handsoldering

Postby chegewara » Mon Feb 15, 2021 7:51 pm

lowtolerance wrote: Very nice! I’m working on a couple of esp32-s2-based projects and its astounding how easy (and CHEAP!!) it is to make a custom pcb for these modules. I’m using the new MINI modules for one, and the PCB is only as wide as the module (<17mm), and the BOM for it is less than $2 USD, including the module 😂
Only about half pins exposed, and missing pins 19 and 20, so no possible to use native USB.

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lowtolerance
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Location: Virginia Beach, Virginia, United States of America

Re: Small ESP32-S2 dev board for handsoldering

Postby lowtolerance » Wed Mar 17, 2021 4:30 pm

chegewara wrote:
Mon Feb 15, 2021 7:51 pm
lowtolerance wrote: Very nice! I’m working on a couple of esp32-s2-based projects and its astounding how easy (and CHEAP!!) it is to make a custom pcb for these modules. I’m using the new MINI modules for one, and the PCB is only as wide as the module (<17mm), and the BOM for it is less than $2 USD, including the module 😂
Only about half pins exposed, and missing pins 19 and 20, so no possible to use native USB.
The ESP32-S2-MINI modules definitely do expose pins 19 and 20

abdel1254
Posts: 1
Joined: Sun Jun 13, 2021 9:42 am

Re: Small ESP32-S2 dev board for handsoldering

Postby abdel1254 » Sun Jun 13, 2021 9:55 am

hello,

I would like to ask questions. i built the circuit board as you showed, i used the same components. but the problem is when the ESP32 S2 tries to connect to the WLAN does not work. I also use a 18650 battery.
Have you tried to connect the board to WiFi? did that work for you?

Thanks

chegewara
Posts: 2362
Joined: Wed Jun 14, 2017 9:00 pm

Re: Small ESP32-S2 dev board for handsoldering

Postby chegewara » Tue Jun 15, 2021 7:01 am

abdel1254 wrote:
Sun Jun 13, 2021 9:55 am
hello,

I would like to ask questions. i built the circuit board as you showed, i used the same components. but the problem is when the ESP32 S2 tries to connect to the WLAN does not work. I also use a 18650 battery.
Have you tried to connect the board to WiFi? did that work for you?

Thanks
Can you check power source, especially voltage on 3.3V pin. Wifi is not tolerant and not accepting over-voltage.
I did once it by accident and connected 5V to 3.3V. esp32 did work normally except that i had issue with connecting to wifi.

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