<![CDATA[Free/Available GPIO PINs Question]]>I've been trying to see what pins are useable/free on the major revision (Core1, Core2, CoreS3) versions of pinouts, and I have a few random (should be easy to answer) questions:

1] GPIO 10 on the CoreS3 - is it used? I couldnt find it on the schematic. It's used in the Core1/Core2 products for Flash write-protect, but cant see anything on the CoresS3 - is it free? Found it

2] GPIO 22 through 27, and GPIO 32 for the CoreS3 - same thing - Are they used? I can't find them referenced in the schematics, although they are -all- used on the Core1 and Core2 (except for GPIO 24 which seemingly isnt used by anything) GPIO 26 and 27 are available

3] GPIO 20 on the Core1 and Core2 - Are they USed? Used by USB

4] GPIO 28 through 31 - are they used on any product? No

5] GPIO 40 through 48, on Core1 or Core2 - Do they exist? I know they are used for a Camera interface on the CoreS3 Only exist on CoreS3, used by camera interface (gpios 38 through 48)

6] GPIO 19/20 on the CoreS3 - they are used for something with USB? Yes

Thanks for any help!strikethrough text

]]>https://community.m5stack.com/topic/5536/free-available-gpio-pins-questionRSS for NodeWed, 29 Apr 2026 07:57:23 GMTWed, 02 Aug 2023 05:25:55 GMT60<![CDATA[Reply to Free/Available GPIO PINs Question on Wed, 02 Aug 2023 21:41:03 GMT]]>Thanks for the replies

]]>https://community.m5stack.com/post/21766https://community.m5stack.com/post/21766Wed, 02 Aug 2023 21:41:03 GMT<![CDATA[Reply to Free/Available GPIO PINs Question on Wed, 02 Aug 2023 16:43:44 GMT]]>For Core1, Core2, and CoreS3 versions, GPIO 22-27 and GPIO 32 are free. GPIO 20 on Core1 and Core2 is used. GPIO 28-31 are unused. GPIO 40-48 are not on Core1/Core2 but are used for Camera on CoreS3. GPIO 19/20 on CoreS3 are used for USB.

]]>https://community.m5stack.com/post/21763https://community.m5stack.com/post/21763Wed, 02 Aug 2023 16:43:44 GMT<![CDATA[Reply to Free/Available GPIO PINs Question on Wed, 02 Aug 2023 15:08:17 GMT]]>Hello @mtylerjr

for ESP32 (Core1 / Core2) have a look here:

3] GPIO20 doesn't exist.
5] last GPIO is 39; so no, GPIO40 to 48 do not exist.

And for ESP32S3 see here:

6] yes, GPIO19 / 20 are connected to the USB connector.

Thanks
Felix

]]>https://community.m5stack.com/post/21761https://community.m5stack.com/post/21761Wed, 02 Aug 2023 15:08:17 GMT<![CDATA[Reply to Free/Available GPIO PINs Question on Wed, 23 Aug 2023 23:25:39 GMT]]>This is what Ive been able to put together from the (often conflicting!) Documents and schematics. Probably has several mistakes, but then so do the docs and schematics :/
0_1692833152142_0d799851-8148-4c95-b152-b9ba21da80a9-image.png
Several question marks remain though.

]]>https://community.m5stack.com/post/21757https://community.m5stack.com/post/21757Wed, 23 Aug 2023 23:25:39 GMT