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Forum Index : Microcontroller and PC projects : Need Help to Remember

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OA47

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Joined: 11/04/2012
Location: Australia
Posts: 1013
Posted: 04:32am 22 Mar 2024
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I am away from the shed at the moment so I can't refer to previous projects and I did a bit of trawling thru the forum but couldn't find an answer. Is it Ok to run an ILI9341 directly off the VBUS pin of the Pi-Pico if the 3T reg is not bypassed?
If so do I need a current limiting resistor to the backlight LED?

0A47
 
phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2837
Posted: 05:40am 22 Mar 2024
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It depends on the version. Older ones have the backlight LEDs going directly to the LED pin so require a resistor. Later ones have a transistor Q1 with a resistor to the LEDs and a 1kΩ base resistor so don't need it, but it won't hurt up to 10kΩ.

I think most people run them from 5V. Just look for Q1.
 
OA47

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Joined: 11/04/2012
Location: Australia
Posts: 1013
Posted: 09:11am 22 Mar 2024
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Thankyou Phil, I put a 33R resistor in just in case.
0A47
 
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