[Done] Salami's 1st GBZ Modded-HDMI UART Shift-Buttons Brightness Control

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salami738
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Re: [WIP] Salami's 1st GBZ Modded-HDMI I2C Shift-Button Brightness Control

Post by salami738 » Thu Jan 04, 2018 5:43 am

LilJosh wrote:
Thu Jan 04, 2018 2:32 am
@salami738
Any tips on how to get the screen to fit correctly into the case? I just started my build and have been having issues with screen clearance even after cutting pcb. Also Very nice build so far! :D
Hi,

i had problems fitting the MPI3508 screen too. I written something about this display in: https://www.sudomod.com/forum/viewtopic ... 242#p51467 (power usage fix for +25% battery runtime is included).
Conclusion: You have to cut the white plastic on the side with the ribbon cable too, to make it fit.
I would recommend the following procedure: Remove the metal backside, then remove a mm or two of the white plastic on the ribbon side (the side with the backlight leds).
BUT: Be careful, dont bend the ribbon cable too much, dont cut into it.
And dont apply pressure, when you insert this into the case, or you have to repair it: https://www.sudomod.com/forum/viewtopic.php?f=53&t=4831.

Take your time and good luck!

greetings

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Re: [WIP] Salami's 1st GBZ Modded-HDMI I2C Shift-Button Brightness Control

Post by LilJosh » Fri Jan 05, 2018 1:30 am

salami738 wrote:
Thu Jan 04, 2018 5:43 am
LilJosh wrote:
Thu Jan 04, 2018 2:32 am
@salami738
Any tips on how to get the screen to fit correctly into the case? I just started my build and have been having issues with screen clearance even after cutting pcb. Also Very nice build so far! :D
Hi,

i had problems fitting the MPI3508 screen too. I written something about this display in: https://www.sudomod.com/forum/viewtopic ... 242#p51467 (power usage fix for +25% battery runtime is included).
Conclusion: You have to cut the white plastic on the side with the ribbon cable too, to make it fit.
I would recommend the following procedure: Remove the metal backside, then remove a mm or two of the white plastic on the ribbon side (the side with the backlight leds).
BUT: Be careful, dont bend the ribbon cable too much, dont cut into it.
And dont apply pressure, when you insert this into the case, or you have to repair it: https://www.sudomod.com/forum/viewtopic.php?f=53&t=4831.

Take your time and good luck!

greetings
Thank you so much! I got the screen to fit using your method will definitely look into saving more battery life. Your linked post is incredibly detailed awesome stuff.

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144TECH
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Re: [WIP] Salami's 1st GBZ Modded-HDMI I2C Shift-Button Brightness Control

Post by 144TECH » Sun Jan 07, 2018 11:02 am

Ah sehr gut ;-), einfach klasse, good you fixed the audio in stereo instead of failing diagrams :lol: Thumbs up !
* Very Rare * GBZ 640x480 v3 Stock Looks 6000MAH
http://www.sudomod.com/forum/viewtopic.php?f=43&t=4863

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Re: [WIP] Salami's 1st GBZ Modded-HDMI I2C Shift-Button Brightness Control

Post by salami738 » Fri Feb 16, 2018 2:01 pm

Hi,
i had some back luck with the arduino leonardos. I killed the first one by shorting wires to GND (probing with a multimeter). On the second one the usb port lifted up, so I am currently using the third one :-)

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Re: [WIP] Salami's 1st GBZ Modded-HDMI I2C Shift-Button Brightness Control

Post by salami738 » Fri Feb 16, 2018 2:04 pm

For the build log, a current picture of the build (16.02.2018):

Image

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Re: [WIP] Salami's 1st GBZ Modded-HDMI I2C Shift-Button Brightness Control

Post by salami738 » Fri Feb 16, 2018 2:07 pm

I have now switched to UART communication between the Arduino and the Raspberry to communicate the battery voltage, calibrate the ADC and get the special button states.

If someone is interested in the code:
- Raspberry: https://gist.github.com/salami738/17994 ... fc1c03797e
- Arduino: https://gist.github.com/salami738/776e5 ... b52935fd75

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Merlin
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Re: [WIP] Salami's 1st GBZ Modded-HDMI UART Shift-Buttons Brightness Control

Post by Merlin » Thu Oct 04, 2018 12:34 pm

Very interesting and clean wip!
About audio diagram...why R input (unused) is grounded?There'is a technical reason?

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Re: [WIP] Salami's 1st GBZ Modded-HDMI UART Shift-Buttons Brightness Control

Post by salami738 » Sat Oct 06, 2018 3:22 am

Merlin wrote:
Thu Oct 04, 2018 12:34 pm
Very interesting and clean wip!
About audio diagram...why R input (unused) is grounded?There'is a technical reason?
Hi, i am only using the LEFT channel of the amp, because I use a mono speaker.
The RIGHT amp channel is grounded to reduce noise.

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Re: [WIP] Salami's 1st GBZ Modded-HDMI UART Shift-Buttons Brightness Control

Post by salami738 » Sat Oct 06, 2018 3:25 am

I saw a member in an other thread with a very interesting solution. He uses the potenziometer between the screen and the headphone jack. So you will have a mechanial loudness trimmer, better than my software idea.

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Re: [WIP] Salami's 1st GBZ Modded-HDMI UART Shift-Buttons Brightness Control

Post by Merlin » Sat Oct 06, 2018 6:45 am

I like your solution.
I don't know why most people can live with mono audio and so lost part of music and sound effect.
(Original game boy is stereo and even if has only one speaker,it's output sound is the sum of L and R without losses)

My setup is: USB SOUND CARD>POTENTIOMETER>HEADPHONE JACK(Stereo)>SPEAKER(with L and R mixed toghether without resistors like Wermy's mintypi build)
Audio is very clear,volume level on headphone is excellent and volume level on speaker is acceptable.
SpoilerShow
Image
In the past I tried to add a PAM8403 amplifier before speaker but sound was very loud and distorted.Maybe because input on ampli was too high!
Now I have to try to add the amplifier and adding resistors to mix L and R and then connect R input to ground like your build!

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