Damn... cant think of anything else but to use a step-up board to 12v...
[Solved] Another screen problem :(
- correia5022
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Re: Another screen problem :(
Damn... cant think of anything else but to use a step-up board to 12v...
________________________________________
Starting on electronics
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Starting on electronics
My first build, 2 years later
https://sudomod.com/forum/viewtopic.php ... 8&start=30
Check out my Boombox: https://nrcboombox.wixsite.com/website
Re: Another screen problem :(
I saw with my multimeter that the display absorbs 90mA.McGyver wrote: ↑Fri Jan 25, 2019 6:13 amThe raspberry itself gives 3.3 out of one of its GPIO pins. Just google the pinout. Maybe the power consumption of the screen is too high for this output. Do you have power values measured from your screen to compare with the pi 3.3 output specs maybe before trying?
See this link about raspberry pi 3.3V rail:
https://www.element14.com/community/thr ... hread=true
The 3.3V pin on raspberry can give 50mA and over that value you can burn the board
I'll try with some generator to give 3.3volt to that display and hope that it will work with that voltage.
If it works with 3.3 volt, i need to reduce my 5v power supply to 3.3v.
Re: Another screen problem :(
Good news for me, the display works with 3.3V and 300 mAhcorreia5022 wrote: ↑Fri Jan 25, 2019 11:33 am
Damn... cant think of anything else but to use a step-up board to 12v...
So now i have 5V battery and i need to convert it to 3.3V, maybe using a lm3940 (if you know some other way, i'm ready to hear it )
The definition si very low (i can't even read the boot words and it's unreadable when i write some command) but it's the same when i use 12v, so the display is not so good.
Do you know some setting to make the display look better?
- correia5022
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Re: Another screen problem :(
You dont need the converter. The RPi0 has a 3.3v pin, just wire it there.Mike9490 wrote: ↑Sat Feb 09, 2019 9:37 am
Good news for me, the display works with 3.3V and 300 mAh
So now i have 5V battery and i need to convert it to 3.3V, maybe using a lm3940 (if you know some other way, i'm ready to hear it )
The definition si very low (i can't even read the boot words and it's unreadable when i write some command) but it's the same when i use 12v, so the display is not so good.
Do you know some setting to make the display look better?
As for screen adjustments, did your's came with a separate board with controls? (3 tactile switches) I boosted mine with 70 brightness, 70 contrast and 60 saturation. It betters the quality, but still hard to read.
Just install the GBZ35 theme and it will be much better.
(i usually make my configs in a hdmi monitor beforehand)
________________________________________
Starting on electronics
My first build, 2 years later
https://sudomod.com/forum/viewtopic.php ... 8&start=30
Check out my Boombox: https://nrcboombox.wixsite.com/website
Starting on electronics
My first build, 2 years later
https://sudomod.com/forum/viewtopic.php ... 8&start=30
Check out my Boombox: https://nrcboombox.wixsite.com/website
Re: Another screen problem :(
correia5022 wrote: ↑Sun Feb 10, 2019 8:06 amYou dont need the converter. The RPi0 has a 3.3v pin, just wire it there.Mike9490 wrote: ↑Sat Feb 09, 2019 9:37 am
Good news for me, the display works with 3.3V and 300 mAh
So now i have 5V battery and i need to convert it to 3.3V, maybe using a lm3940 (if you know some other way, i'm ready to hear it )
The definition si very low (i can't even read the boot words and it's unreadable when i write some command) but it's the same when i use 12v, so the display is not so good.
Do you know some setting to make the display look better?
As for screen adjustments, did your's came with a separate board with controls? (3 tactile switches) I boosted mine with 70 brightness, 70 contrast and 60 saturation. It betters the quality, but still hard to read.
Just install the GBZ35 theme and it will be much better.
(i usually make my configs in a hdmi monitor beforehand)
Yes, my screen contro board has the separate board with the 3 switches, i'll try to use it.
The problem is the 3.3V pin on the raspberry Pi Zero: i have read that the maximum permitted current draw from the 3.3 V pin is 50 mA and i need 300mA...
I don't think that the 3.3V pin can turn on the display ( and I'm afraid of burning my RPi0 ) ...
- correia5022
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Re: Another screen problem :(
Oh, yeah you are right about that 3.3v pin.Mike9490 wrote: ↑Sun Feb 10, 2019 9:01 amYes, my screen contro board has the separate board with the 3 switches, i'll try to use it.
The problem is the 3.3V pin on the raspberry Pi Zero: i have read that the maximum permitted current draw from the 3.3 V pin is 50 mA and i need 300mA...
I don't think that the 3.3V pin can turn on the display ( and I'm afraid of burning my RPi0 ) ...
Use a linear regulator, like 3.3V 800mA Linear Voltage Regulator - LD1117-3.3 TO-220
https://www.adafruit.com/product/2165
or a LM3940
http://www.ti.com/product/LM3940#
________________________________________
Starting on electronics
My first build, 2 years later
https://sudomod.com/forum/viewtopic.php ... 8&start=30
Check out my Boombox: https://nrcboombox.wixsite.com/website
Starting on electronics
My first build, 2 years later
https://sudomod.com/forum/viewtopic.php ... 8&start=30
Check out my Boombox: https://nrcboombox.wixsite.com/website
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