kelderkold
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Location: Danmark
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3v out when lcd occupied the pins

Sun Aug 19, 2018 8:04 am

Hi
I bought a 3.5 inch lcd screen where the screen uses all pins with 3 volt
how can i get 3 volt out then?

I need the 3 volt to my ir sensors

this screen:
https://www.ebay.com/itm/3-5-Inch-LCD-D ... 0005.m1851

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FTrevorGowen
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Re: 3v out when lcd occupied the pins

Sun Aug 19, 2018 5:16 pm

kelderkold wrote:
Sun Aug 19, 2018 8:04 am
Hi
I bought a 3.5 inch lcd screen where the screen uses all pins with 3 volt
how can i get 3 volt out then?

I need the 3 volt to my ir sensors

this screen:
https://www.ebay.com/itm/3-5-Inch-LCD-D ... 0005.m1851
By "all pins with 3 volt" do you mean physical pins 1 & 17 together with some of the ground (0V) pins (6, 9, 14, 20, 25, 30, 34 & 39)?
How is the display (physically) connected, ie. what type, size of connector - photo. perhaps?
The available current from the Pi's "on-board" 3.3V supply is limited so, where a few 3.3V devices are in use it's quite common to add an external 3.3V voltage regulator, fed by the Pi's 5V supply eg: http://www.cpmspectrepi.uk/raspberry_pi ... V3Lcd.html
also some "level-shifter modules" may provide a similar supply: http://www.cpmspectrepi.uk/raspberry_pi ... dules.html
Also there are "multiple header expansion boards" eg. http://www.cpmspectrepi.uk/raspberry_pi ... Stack.html
Trev.
Still running Raspbian Jessie or Stretch on some older Pi's (an A, B1, 2xB2, B+, P2B, 3xP0, P0W, 2xP3A+, P3B+, P3B, B+, and a A+) but Buster on the P4B's. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm

DirkS
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Joined: Tue Jun 19, 2012 9:46 pm
Location: Essex, UK

Re: 3v out when lcd occupied the pins

Sun Aug 19, 2018 6:10 pm

FTrevorGowen wrote:
Sun Aug 19, 2018 5:16 pm
How is the display (physically) connected, ie. what type, size of connector - photo. perhaps?
https://ae01.alicdn.com/kf/HTB1I7hPSXXX ... c99ccf3554
26pin GPIO connector. Screen is HDMI, Touch probably uses spi0.1 and 1 or 2 more GPIO. and of course power / ground pins

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