S3 Amoled Touch, H681 different board layout

Reply to S3 Amoled Touch, H681 different board layout on Sat, 23 Dec 2023 20:06:53 GMT

teastain2 — Sat, 23 Dec 2023 20:06:53 GMT

@pike2k It was worse a year ago, I had to make my own LilyGO T-Display S3 (not AMOLED) GitHub repository to help people once I got it figured out.
The one on the left of the schematic image that I sent you is
U0RXD = SCL (GPIO 44) (The 'U' stands for Universal)
U0TXD = SDA (GPIO 43) use Wire.begin(43, 44);

The other connector is marked correctly.
It might have been added as an after thought because the ancient but very common Dallas Semiconductor DS18B20 won't run from the GPIO pins 43 or 44.
ESP32 S3 can use almost any pins for almost any function .
But when setting up I2C you have to call Wire.begin(3, 2);
Or whatever pins you want, within reason. (There is a complicated datasheet for the ESP32 S3 and it points out the only no-no's.)
-Terry

Reply to S3 Amoled Touch, H681 different board layout on Sat, 23 Dec 2023 17:10:30 GMT

pike2k — Sat, 23 Dec 2023 17:10:30 GMT

@teastain2 Thank you for the additional information.

Where do you see that the 2nd connector can also be used for i2c?
And also, which connector is which?
So little information from Lilygo

Reply to S3 Amoled Touch, H681 different board layout on Sat, 23 Dec 2023 15:55:11 GMT

teastain2 — Sat, 23 Dec 2023 15:55:11 GMT

@pike2k https://github.com/Xinyuan-LilyGO/LilyGo-AMOLED-Series/blob/master/schematic/T-Display-S3-AMOLED-Touch.pdf
second I2C / qwiic connector bonus!

CN1 is labeled as a UART port but can host I2C.

Reply to S3 Amoled Touch, H681 different board layout on Sat, 23 Dec 2023 11:51:51 GMT

pike2k — Sat, 23 Dec 2023 11:51:51 GMT

@teastain2

The H681 model is a different board completely. See the extra QWIIC? connector? I find zero documentation on this layout.

Reply to S3 Amoled Touch, H681 different board layout on Fri, 22 Dec 2023 21:01:23 GMT

teastain2 — Fri, 22 Dec 2023 21:01:23 GMT

@teastain2 These are just LilyGO T-Display S3 but same connectors...

-Terry

Reply to S3 Amoled Touch, H681 different board layout on Fri, 22 Dec 2023 20:50:25 GMT

teastain2 — Fri, 22 Dec 2023 20:50:25 GMT

@pike2k They have screwed up and made it very confusing. Here is the info for the LilyGO T-Display S3 AMOLED:
https://github.com/Xinyuan-LilyGO/T-Display-S3-AMOLED
and the touch version here:
https://github.com/Xinyuan-LilyGO/LilyGo-AMOLED-Series/blob/master/examples/Touchpad/Touchpad.ino

The side connector that is available?
It is the standard 0.1" DIP/SIP standard from the 70s (!) It is often incorrectly referred to as "Dupont"
You can order them with, or without.
Product Pno. H681 does not come with them soldered, but loose in the box!
They are challenging to solder!
I will post pics in a minute...
-Terry