T-Display-S3-Pro
T-Display-S3-Pro copied to clipboard
Xinyuan-LilyGO
Touch not working reliable
I have the issue that the touch screen is not working reliable on my T-Display-S3-Pro. The problem is with the factory code as well as my custom code using Arduino GFX + LVGL. When using the "capacity touch" sample code it seems to detect all inputs so it does not really seem like the device itself is broken? I also have a second unit - same behaviour?
https://github.com/Xinyuan-LilyGO/T-Display-S3-Pro/assets/19491804/4728e317-8e50-4639-a78a-a0311a4c3041
https://github.com/Xinyuan-LilyGO/T-Display-S3-Pro/assets/19491804/d52b48f9-dbf8-43fa-9f5b-b6b743c385fd
First confirm whether the touch is normal, you can write https://github.com/Xinyuan-LilyGO/T-Display-S3-Pro/tree/master/examples/CapacitiveTouch to test.
First confirm whether the touch is normal, you can write https://github.com/Xinyuan-LilyGO/T-Display-S3-Pro/tree/master/examples/CapacitiveTouch to test.
Did you read my post? That is what I already confirmed „.. when using the "capacity touch" sample code it seems to detect all inputs so it does not really seem like the device itself is broken“.
Still troubleshooting … the issue seems to get worse when using battery instead of usb power?
I also read about battery related issues with other ESP32 projects:
„I had the same problem. The solution was to bild a touch pad with two areas (for example two half circles) , one for touch pin and the other one connected to ground. It seems that a pc has more "mass" and therfore a better ground for the circuit. With battery or another power suply the touch pad has to have an aditional pad to ground.“
When you apply it in your project, have you printed the touch output coordinates and are they normal? Or do you display it on the screen and observe whether the coordinates are the same as the actual touch position?
Which touch library are you using?
So I can confirm it has something to do with battery vs usb powered mode.
You can try my sample code yourself (https://github.com/pixelwave/t-display-s3-pro) with the following test setups:
- Power Switch "OFF", connected and powered from USB port (PC/Laptop)
- Power Switch "ON" battery powered only
In scenario 1) the touch inputs work reliably and 99% of the time. In Scenario 2) the touch is a hit and miss. Sometimes the buttons work sometimes not.
So in summary I assume a general hardware issue with the board design and how the battery is connected (GND issue?). I hope this can be resolved in an updated version (I have V1.1) because otherwise the product is quite awesome! But with that flaw currently unusable im battery mode.
Contacting support to find a solution ..
I used the sample code test above. In Scenario 2, touch is normal.
https://github.com/Xinyuan-LilyGO/T-Display-S3-Pro/assets/67771110/8f8f0560-88da-4a00-96f2-1e1b357753e2
Please tell me how many S3-Pro you bought in total, you can contact the after-sales service to return or replace the goods.
I bought 2 in total already contacted sales ([email protected]) and they forwarded it to the orders ([email protected]) team. Currently waiting for their feedback. I noticed you are using a different unit? Is it maybe a preproduction or newer unit? Has there been any updates since V1.1? Because both my units show the same behaviour I tend to believe it is more a general hardware design issue?
See below my production (V1.1) device with and without cable:
https://github.com/Xinyuan-LilyGO/T-Display-S3-Pro/assets/19491804/058bc7e9-1d75-4273-9e98-23b69ad9c587
https://github.com/Xinyuan-LilyGO/T-Display-S3-Pro/assets/19491804/4569dcfc-1853-47ad-8aff-7bc7a3949baa
I know what your problem is. Please change it to the following:
build_flags=
; -DARDUINO_USB_CDC_ON_BOOT=1
-UARDUINO_USB_CDC_ON_BOOT
If Cdc is turned on, the serial port will block the program from running.
The arguments are as written in the official lilygo sample code.
But I compiled it with the variables like you suggested:
No change same behaviour. When in "battery mode" touch screen does NOT work reliably.
Please note that
; -DARDUINO_USB_CDC_ON_BOOT=1
has been commented out and
-UARDUINO_USB_CDC_ON_BOOT
is enabled
Compiled now like this:
Still unchanged behaviour. USB powered = all fine. Battery powered = touch very janky.
If you can try to enter the binary file I provided, and test whether it is caused by environmental reasons.
The writing method can follow here
Flashing worked both times. I just wanted to try with different tools. Also both times completely erased flash.
The touch problem is still there.
I have received a message from customer service. I am very curious about what the problem is. Customer service will communicate with you next. I hope to send back these two boards. I want to find out the reason.
Yes me too! Would love to ultimately fix the problem and have working boards. Because the product on paper is great. So I am going to contact with customer support next to send the boards back? I will leave the code on there for you to check ...
The issue will be kept. If it can be received, I will continue to update it.
... support is not answering anymore? I asked how to return the product. Can you help or contact them?
Tomorrow I will ask how to deal with it, and I will reply to you here after I get the answer.
Did yesterday - thanks for pinging. But still waiting for their solution on how to ship back the products.
My unit also has the same issue, fine on USB power, but bad when self-powered.
After all testing I really think it is a hardware based issue. Maybe just for this specific revision (mine was V1.1). @lewisxhe BTW I am still waiting for the shipping cost refund until I can return the two units for you to test ...
@pixelwave Hi, have you not arranged how to ship it back after the sale? It's a little weird that both of them have problems. If I can ship them back, I will check what caused the problem.
I'm wondering if anyone knows if there is a solution for this. I recently came across the same issue - When I have the T-Display S3 Pro connected to my computer with a USB cable the touch screen reacts quickly and perfectly. However, when I disconnect the USB cable from the T-Display S3 Pro the touch because much less reliable and often doesn't sense my finger touching the screen. I have it set up so that it displays the x and y coordinates on the screen so I can see if it sees where I touched the screen and there I can see that the numbers do not change.
I have also recreated the problem I was seeing before - this time using the "CapacitiveTouch" example provided by LilyGo on their GITHUB page meaning I can rule out anyting in my code as being a problem. https://github.com/Xinyuan-LilyGO/T-Display-S3-Pro/tree/master/examples/CapacitiveTouch
To summarize, the problem is a follows, when the unit is powered from the USB port, it recognizes all touches on the screen without any problems. When the USB power is removed and the unit is powered by the internal battery it sometimes works and sometimes doesn't recognize the touches on the screen. This makes the T Display S3 Pro unusable for me as a battery powered, portable device.
I have sent LilyGo an email about this issue but I still have not heard back from them. Oh and my unit is version 1.1
