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karrika
Posts: 1045
Joined: Mon Oct 19, 2015 6:21 am
Location: Finland

Touch is very sensitive to high frequency PSU noise

Thu Feb 15, 2018 1:41 pm

I have been wondering why the touchscreen is sometimes sensitive and sometimes not. If the PSU has a small high frequency ripple the touch screen is jumpy. If I swap to a good quality PSU it works like a dream.

The interesting thing is that a PSU that works perfectly with RPi 3 still does not work well with the touch screen.

The "official" white PSU for Raspberry has no problems with the touch screen.

Most ebay stuff makes the touch jumpy.

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