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Forum Index : Microcontroller and PC projects : 2.4" ILI9341 LCD
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palcal Guru  Joined: 12/10/2011 Location: AustraliaPosts: 1993 |
I have a problem with these screens I have 3 where touch has stopped working and I find if I try to calibrate them I can touch the first 2 targets then no more appear. I get an error 'touch hardware failure'. I haven't had it happen with 2.8" screens. I tried the screens with another board but no go. The screens must be stuffed. Anyone else had this problem? Edit...I just had a look to buy some more and noticed that it says "5v compatible use on 3.3V". I am running them on 5v. maybe I should use 3.3v> There is a 3.3v regulator on the display so I think it runs off 3.3v anyway and the LED pin is separate and connected to 5v., in my case anyway. Edited 2020-12-09 13:53 by palcal "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2950 |
Hi Paul, I think there is some incompatibility on many of the newer batches of TFTs, you can try cutting the MISO pin off as this fixed some of the 2.8" that didnt work. Kind Regards Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3292 |
Disabling MISO only applies to the ILI9488 3.5" display. The ILI9341 should not need this. When the firmware reads the position given by the touch controller it cannot tell if it is a genuine reading or rubbish given by a failed controller. However, on the second touch point in can tell if the controller has failed when it gets the same rubbish. This is why it requires two touches before you get 'touch hardware failure' error. I have found the ILI9341 LCDs to be quite flakey. However, with them being so cheap you can afford to buy a few extra as backups. They are also VERY sensitive to static. When I started taking precautions and grounding myself the rate of failures markedly decreased. Geoff Geoff Graham - http://geoffg.net |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1993 |
Thanks for that, funny thing is I managed to get one to calibrate and with one that would not calibrate I found touch worked if I plugged it onto a board that had been previously calibrated. I have three screens and many MMs and I'm going in circles at the moment. I'll get some new screens and make sure I earth myself properly, my usual method is just bare feet on the tiled floor. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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CaptainBoing Guru Joined: 07/09/2016 Location: United KingdomPosts: 2170 |
Treat yourself for Xmas. ebay anti-stat then attach the other cable to an electrical earth. I always use a full anti-stat set up while assembling electronics like this, especially modules and FETs. Old habits... and few casualties Edited 2020-12-09 20:21 by CaptainBoing |
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| Paul_L Guru Joined: 03/03/2016 Location: United StatesPosts: 769 |
At Pan Am in the Inertial Navigation System and Central Air Data Computer shops we installed grounding strips in the floor, grounded metal benches, wrist straps and room air humidifiers in order to stop the static damage to all those custom CMOS chips! Paul in NY |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
I've got a pair of conductive sole boots that will do the job nicely! Used when working close to live EHV transmission gear to stop your hair standing up. Not a problem for me anymore. Jim VK7JH MMedit |
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