Pi in a Sega Genesis USB Hub Build

obsidianspider

@hansolo77 yeah, sometimes I wish the forum had a DM feature, but I can also see it being abused where developers would be inundated with stuff. Oh well. I made these build threads to show how I'm making my projects, mistakes and all, to try to help others. Some just show off the end product, and that's fine, but I still largely have no clue what I'm doing, so if I can write up how I solved problems maybe that can help someone else learn too.

edmaul69

@obsidianspider if yo decide to add a usb audio aplifier you could make the volume slide work for a headphone jack with a 20mm slide potentiometer.

ebay link

cyperghost

@edmaul69 @obsidianspider
Come on use your fantasy :) You both inspire me to do stupid things :)
Set two switches on the volume slider and connect to GPIO :)
Then you should be able to raise and lower volume .... Is that a good idea?
If it does not work via ES then it works 100% with alsa sound mixer :)

edmaul69

@cyperghost if you can control the audio level through the gpio with this that would be awsome.

cyperghost

@edmaul69 That is easily possible!

# Gets a list of simple mixer controls
$ amixer scontrols 
Simple mixer control 'Master',0

then

amixer sset 'Master' 10%+

Raises mastervolume to 10% ingrements and you will just need a script that read out the GPIO to raise and the GPIO to lower volume.

EDIT:
Well I would use two springs, that center the slider. Then you hold it in + position and the script ask every 0,5 seconds the status of the GPIO and then raises volume +10%. Hold the slider in - position the script asks the status of the GPIO and lowers volume -10%

meyemind

With the power on/off switch, here is a solution I'm going to try for my build, thank you @obsidianspider , definitely following your progress to lead the way for mine!! (solder station arrives tomorrow :) The LED can go straight to the genesis hub, and I'll incorporate the switch as well.

Cheers,

alt text

cyperghost

@meyemind Does this fit in the case? I'm a bit concerned...
What is the difference between the powerblock and the mausberry?
Are these circuits a "must have" or more a "nice to have"?

Can we get them cheaper? :D

meyemind

@cyperghost I'm not sure how @obsidianspider was going to fold in the mausberry, but from what I can tell, yes the powerblock should fit just fine, I was confident enough to make purchase and will post a reply once I have it and can show that it fits.

meyemind

@cyperghost Regarding the "must have" vs "nice to have" hooking up the power switch on the genesis USB hub is definitely a "nice to have" option. The pi3's don't come with an on/off power switch, you would "sudo shutdown -h now" command line or via terminal to properly and safely shutdown the pi before pulling the plug. Furthermore all of the emulation OS options out there have GUI options to do this as well.

But putting in a switch is so much sexier... ;)

cyperghost

@meyemind Well I ask because you can do the shutdown just with a switch and some scripts. I would try to usw the circuit from @adamspc but the shopping costs are high...

Is there a way to geht the circuits cheaper?

meyemind

@cyperghost Sorry, which circuit from @adamspc are you talking about?

cyperghost

@meyemind http://othermod.com/product/advanced-onoff-board/

meyemind

@cyperghost Ya, nice one, if the soft on/off action is what your looking for. After a few quick searches on pi3 soft on/off... it pretty much returned a page with your link and this simple soft on/off one.

Looks like it's a custom board that unless you can find someone else who created an alternative soft on/off option for cheaper w/ $hipping, then that Advanced On/Off Board is your best bet. Keep us posted.

obsidianspider

@meyemind said in Pi in a Sega Genesis USB Hub Build:

@cyperghost I'm not sure how @obsidianspider was going to fold in the mausberry

With the 2-pin spring header board as a separate piece, I'm planning to have it sit next to the Pi board and connect the Mausberry via wires, not a plug. The Mausberry hasn't arrived yet, but once it does, don't worry, I'll post pictures of how it does, or doesn't work. Since I'm still looking for a power switch I may use a simple light switch flopping around on the outside of the case temporarily to control the Mauseberry.

cyperghost

@obsidianspider Yes I think the mausberry (spring version) is the best option. The board from petroblock seems to be a bigger in size ....

But the costs are high....
17$ + 5$ shipping is okay for mausberry
22$ + 5$ shipping for petroblock is okay :)
10$ + 20$ shipping for othermod is great (without shipping)

But how the circuits work?

The othermod seems to use the TX pin of the UART interface, one GPIO Pin and use python scripts.
petro function I can't explain :)
The Mausberry uses two GPIOs and a batch script.
Can someone tell me which one better, faster, more relieable?
What switches are needed for each? Momentary switches or just push buttons?

Or am I wrong?

moosepr

@obsidianspider couldn't you use a microswitch like the inside of an arcade joystick?

http://m.ebay.co.uk/itm/182057484715

Maybe if you can position it so the actual sliding switch hits the lever?

obsidianspider

@moosepr Not a terrible idea, but I wonder how well it will stay in position. Since it's acting as a power switch I don't want it to flop around.

moosepr

@obsidianspider good point, is there any resistance on the switch? does it click into the on/off positions?

moosepr

@obsidianspider ignore my random chicken scratch if it makes no sense

scribblez

hansolo77

I just got my tracking number from shirtpunch. It's on the way!