I have now purchased three of Part No. 2090. Two are working perfectly as expected with my hardware and firmware. However, the last unit received from my last purchase appears to have a faulty touch screen while connected to the same hardware running the same firmware. It appears to be intermittent to the touch in one corner of the screen while its interrupt pin appears to be active without touching the screen. The display itself appears to be ok but it is of no use to me without a working touchscreen.
I would like to request a replacement ASAP as I am building multiple devices that use this product.
Faulty Cap Touchscreen on 2.8 TFT LCD Breakout Board
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- harvtech
- Posts: 11
- Joined: Sun Sep 29, 2013 8:22 pm
- mikeysklar
- Posts: 13936
- Joined: Mon Aug 01, 2016 8:10 pm
Re: Faulty Cap Touchscreen on 2.8 TFT LCD Breakout Board
What was the date of purchase for the non-working touchscreen?
Can you post a photo of the setup?
Can you post a photo of the setup?
- harvtech
- Posts: 11
- Joined: Sun Sep 29, 2013 8:22 pm
Re: Faulty Cap Touchscreen on 2.8 TFT LCD Breakout Board
Thank you for your response. Purchase date was 5/28/23. The setup was simply a swap with a working unit in a working setup so a photo will not provide any clue as to what was happening with the new unit.
As I reported it appeared to be an intermittent problem. I am happy to report that after reconnecting an EYESPI cable to the unit today the intermittent touch screen behavior did not happen. All I can think of is that it might have been something to do with the way the cable was aligned in the connector on the breakout board because there was no problem when another unit was connected to the same cable. I also cannot be sure if the cable I used today was the same one used when I experienced the problem because I put that one back in a bag along with others I had purchased.
So it appears that there really is nothing wrong with the new unit and there is no need to replace it.
As I reported it appeared to be an intermittent problem. I am happy to report that after reconnecting an EYESPI cable to the unit today the intermittent touch screen behavior did not happen. All I can think of is that it might have been something to do with the way the cable was aligned in the connector on the breakout board because there was no problem when another unit was connected to the same cable. I also cannot be sure if the cable I used today was the same one used when I experienced the problem because I put that one back in a bag along with others I had purchased.
So it appears that there really is nothing wrong with the new unit and there is no need to replace it.
- harvtech
- Posts: 11
- Joined: Sun Sep 29, 2013 8:22 pm
Re: Faulty Cap Touchscreen on 2.8 TFT LCD Breakout Board
I would like this unit to be replaced as it is of no use to be without a working touch screen.
- harvtech
- Posts: 11
- Joined: Sun Sep 29, 2013 8:22 pm
Re: Faulty Cap Touchscreen on 2.8 TFT LCD Breakout Board
To illustrate this issue my application code uses the touch screen interrupt output as an external interrupt that toggles the state off bool touch_flag.
//ISR
ICACHE_RAM_ATTR void touchdetect()
{
touch_flag = !touch_flag;
digitalWrite(touchInd_pin, touch_flag);
}
The state of touch_flag is monitored at an ESP32 output defined as touchInd_pin.
Attached are DSO waveforms of random events captured at that output that should not have occurred because the screen had not been touched.
//ISR
ICACHE_RAM_ATTR void touchdetect()
{
touch_flag = !touch_flag;
digitalWrite(touchInd_pin, touch_flag);
}
The state of touch_flag is monitored at an ESP32 output defined as touchInd_pin.
Attached are DSO waveforms of random events captured at that output that should not have occurred because the screen had not been touched.
- Attachments
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- bogus touch 3.png (14.66 KiB) Viewed 83 times
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- bogus touch 2.png (12.79 KiB) Viewed 83 times
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- bogus touch 1.png (11.89 KiB) Viewed 83 times
- mikeysklar
- Posts: 13936
- Joined: Mon Aug 01, 2016 8:10 pm
Re: Faulty Cap Touchscreen on 2.8 TFT LCD Breakout Board
Sure, we can replace this unit.
Please e-mail [email protected] to request a replacement. They will need your order# and a link to this forum thread as your authorization. Thank you for the extensive testing.
Please e-mail [email protected] to request a replacement. They will need your order# and a link to this forum thread as your authorization. Thank you for the extensive testing.
- harvtech
- Posts: 11
- Joined: Sun Sep 29, 2013 8:22 pm
Re: Faulty Cap Touchscreen on 2.8 TFT LCD Breakout Board
Thank you for your response. I have made that request.
Please be positive and constructive with your questions and comments.