Dreamcast VMU Pi [Completed]

Show off your completed VMµ, or post your build logs here!
satri360
Posts: 43
Joined: Wed Mar 22, 2017 12:59 am
Has thanked: 9 times
Been thanked: 54 times

Re: Dreamcast VMU Pi

Post by satri360 » Tue Mar 28, 2017 10:10 am

moosepr wrote:You don't technically need the power boost! You can actually run the pi as low as 3v (I have read it will even run as low as 2.7v) so in my projects I have been powering the pi straight from the li-po battery! The only thing you need to be sure of, is that the battery is protected so it doesn't become over discharged. Some battery's have a tiny pcb attached to them which allow this.
Good to know that Zero can run at 3V or even directly from the VBAT. OTG and HDMI won't work without 5V but I removed the connectors anyway. I am still using the Boost as to have the kill switch.

satri360
Posts: 43
Joined: Wed Mar 22, 2017 12:59 am
Has thanked: 9 times
Been thanked: 54 times

Re: Dreamcast VMU Pi

Post by satri360 » Tue Mar 28, 2017 10:20 am

moosepr wrote:best i have found is 128*160

https://www.aliexpress.com/item/1-44-in ... 84209.html

but that will probably just be a little taller to make space for the extra 32 pixel rows
Wow... a lot of 1.44 inch LCD screen out there. You've already found out that backlight LED can be driven by 3.3V supply with a series current limiter R = (3.3-Vf)/If ~= 22Ω at least for Nokia 5110 LCD copy. Then we can get rid of all boosters. Very good idea.

satri360
Posts: 43
Joined: Wed Mar 22, 2017 12:59 am
Has thanked: 9 times
Been thanked: 54 times

Re: Dreamcast VMU Pi

Post by satri360 » Tue Mar 28, 2017 3:41 pm

obsidianspider wrote:I managed to find your test video on YouTube last night at around 2 AM, so of course now I am attempting this as well. Thanks to @moosepr for directing me to this thread from my post over at the RetroPie forum.

Which OLED are you using? Is it the 1431? https://www.adafruit.com/products/1431
Yep!

satri360
Posts: 43
Joined: Wed Mar 22, 2017 12:59 am
Has thanked: 9 times
Been thanked: 54 times

Re: Dreamcast VMU Pi

Post by satri360 » Sat Apr 15, 2017 10:39 am

I've got extra VMUs last week. Some of them are missing the cap. Is this something we can easily design in 3D printer ?
Attachments
IMG_1331_clipped.png
IMG_1331_clipped.png (1.16 MiB) Viewed 4761 times

User avatar
moosepr
Posts: 523
Joined: Wed Jan 25, 2017 6:18 am
Has thanked: 69 times
Been thanked: 241 times
Contact:

Re: Dreamcast VMU Pi

Post by moosepr » Sat Apr 15, 2017 1:38 pm

That's a whole lot of vmu's!

Are you going into production?
Get a small cheep LCD in your project https://www.sudomod.com/forum/viewtopic.php?f=22&t=2312
Wrap it all round a battery https://www.sudomod.com/forum/viewtopic.php?f=13&t=2292
Or use a custom PCB to make it really small https://www.sudomod.com/forum/viewtopic.php?f=13&t=2512
or make it really really really really tiny!! https://www.sudomod.com/forum/viewtopic.php?f=13&t=2919

User avatar
RetroRocket
Posts: 145
Joined: Sun Apr 09, 2017 8:53 pm
Location: Seattle
Has thanked: 59 times
Been thanked: 64 times
Contact:

Re: Dreamcast VMU Pi

Post by RetroRocket » Sat Apr 15, 2017 3:06 pm

satri360 wrote:
Sat Apr 15, 2017 10:39 am
I've got extra VMUs last week. Some of them are missing the cap. Is this something we can easily design in 3D printer ?
Depending on the wall thickness, I shouldn't think it would be difficult. I'm a bit overwhelmed with work atm, but could take a crack at it in a couple weeks. I'll keep an eye out for an original cap and can probably duplicate it reasonably quickly. Or would you want to modify it for extra space?
http://www.josephquinndesign.com

Current Projects:
GBZ - Clear
GBZ - Two-Tone


RetroBro - Fully Custom Orange Pi PC Handheld Fully Custom Orange Pi PC Handheld

satri360
Posts: 43
Joined: Wed Mar 22, 2017 12:59 am
Has thanked: 9 times
Been thanked: 54 times

Re: Dreamcast VMU Pi

Post by satri360 » Sun Apr 16, 2017 6:13 am

moosepr wrote:
Sat Apr 15, 2017 1:38 pm
That's a whole lot of vmu's!

Are you going into production?
Hehe. I start to collect all the variants of the VMUs but found red/black/godzilla versions are way too pricy. This should be good enough to play with casing and give pi-powered-vmu to friends eventually. ;)

satri360
Posts: 43
Joined: Wed Mar 22, 2017 12:59 am
Has thanked: 9 times
Been thanked: 54 times

Re: Dreamcast VMU Pi

Post by satri360 » Sun Apr 16, 2017 6:22 am

RetroRocket wrote:
Sat Apr 15, 2017 3:06 pm
satri360 wrote:
Sat Apr 15, 2017 10:39 am
I've got extra VMUs last week. Some of them are missing the cap. Is this something we can easily design in 3D printer ?
Depending on the wall thickness, I shouldn't think it would be difficult. I'm a bit overwhelmed with work atm, but could take a crack at it in a couple weeks. I'll keep an eye out for an original cap and can probably duplicate it reasonably quickly. Or would you want to modify it for extra space?
That would be very nice if you can help duping the cap! The thickness is 1.50mm. Actually I need to remove the internal rib otherwise SD won't fit in the case.
Attachments
VMU_lid_rib.png
VMU_lid_rib.png (20.96 KiB) Viewed 4740 times

satri360
Posts: 43
Joined: Wed Mar 22, 2017 12:59 am
Has thanked: 9 times
Been thanked: 54 times

Re: Dreamcast VMU Pi

Post by satri360 » Sun Apr 16, 2017 6:32 am

My VMU regains the audio thanks to moosepr and obsidianspider in the thread https://retropie.org.uk/forum/topic/917 ... ild-wip/33

# Edit /boot/config.txt

Code: Select all

dtoverlay=pwm,pin=18,func=2
# Boost up the volume

Code: Select all

$ amixer cset numid=1 -- 100%
numid=1,iface=MIXER,name='PCM Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=-10239,max=400,step=0
  : values=400
  | dBscale-min=-102.39dB,step=0.01dB,mute=1
https://youtu.be/vX30hkX5Ims

User avatar
moosepr
Posts: 523
Joined: Wed Jan 25, 2017 6:18 am
Has thanked: 69 times
Been thanked: 241 times
Contact:

Re: Dreamcast VMU Pi

Post by moosepr » Sun Apr 16, 2017 6:52 am

Glad to be of assistance! :)

The sound isn't really loud, but it's enough to add to the fun
Get a small cheep LCD in your project https://www.sudomod.com/forum/viewtopic.php?f=22&t=2312
Wrap it all round a battery https://www.sudomod.com/forum/viewtopic.php?f=13&t=2292
Or use a custom PCB to make it really small https://www.sudomod.com/forum/viewtopic.php?f=13&t=2512
or make it really really really really tiny!! https://www.sudomod.com/forum/viewtopic.php?f=13&t=2919

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest