I/O Board

[Cebion]

Alright I think I'm almost ready to start assembling my IO 5.2 Board.

I do have some questions though because SMD stuff is pretty new for me.

- On the button pads are two more solder pads. Are these alternative versions for smaller buttons?
- The ceramic caps don't have any indication of polarity. Are these non-polarized?
- Same for the resistors?
- The P1 for the Pins are only important for connecting the board in the right way correct?
- Anything else I should watch out for?

For soldering I practised on an old usb card with lots of the same caps and resistors so there should be no problem there.

[Storm82]

1. Yes these pads are for smaller buttons
2. Ceramic capacitors don't have a polarity, only electrolytic and tanthal capacitors do
3. Resistors also don't have a polarity
4. yes
5. Watch out for the polarity of the fat black tanthal capacitors (the smaller solder-pad marks the spot where the dash of the capacitor goes, LED's (K marks the spot for the short leg of the LED) and the barrel-shaped diodes (the thin line marks the spot where the end of the diode with the black bar has to go)
Also put a jumper on P5 to enable the LED's

[Cebion]

Well that was an interesting one.
Had a lot of fun.
The first 1-2 were kinda difficult because I used too much solder but I remade these later.
I don't know how people solder without flux but it was my lifesaver.

Caps and Resistors are done, only waiting on the SD-Card holder now.

Thanks a lot for the info storm. Helped me a lot!

20180327_192741.jpg

[Storm82]

You're welcome.

Your solder-job looks very good!

My solder is with integrated flux. Without it, it is really tiresome to solder SMD.

[Cebion]

Mission completed

20180405_201340 - Copy.jpg

Now I have parts for 4 more boards.

Edit:

I do have a question about audio.
On all cores I have testes so far I only get the audio from the left speaker.
Tried different cables so that's not the issue.

I can't see any problems on the traces to C5 and C6 might it be a software problem?

[cvenditti]

Sorgelig,

Can you please add the new I/O board (I2S connector) to PCBWay? (I can do it but the 10% are for you)
Thank you
Cyril

[Sorgelig]

New version (v5.3) isn't finished yet! Please don't use it. More changes will be made before release.

[cvenditti]

Great! thank you

[Cebion]

I got two final questions regarding two parts.

- What kind of screws did you guys use to mount the fans?
- The fans I ordered came without a connector, any reccomendations for a connector?

[cvenditti]

The fans I ordered came without a connector, any reccomendations for a connector?

I'm using that: JST XH 2.54 2-Pin Right Angle Connector plug Male , Female , Crimps (50 for $3):
https://www.aliexpress.com/item/100-Set ... 0.0.lrvhDX

[cvenditti]

Can I use a 1N4148 diode for D1and D2 instead of the BAV100-GS08 diode. I have tone of those already.

https://www.aliexpress.com/item/Free-sh ... autifyAB=0

Thank you
Cyril

[Sorgelig]

Can I use a 1N4148 diode for D1and D2 instead of the BAV100-GS08 diode. I have tone of those already.

https://www.aliexpress.com/item/Free-sh ... autifyAB=0

Thank you
Cyril

of course! 1N4148 - that's what i'm using. Basically any diode with the same foot print is ok. There no special frequency or voltage required.

[Sorgelig]

By the way, instead to look for components on Aliexpress, i suggest https://lcsc.com/
You will get them faster and from single company. I've added links to some components on IO Board BOM.

[cvenditti]

Great.
Thank you
Cyril

[Cebion]

BTW, what does the SoG Switch exactly do?

[Sorgelig]

enable Sync-On-Green (or Sync-On-Y)

[Cebion]

Thank you! =)

[cvenditti]

Hi Sorgelig,

I'm ready to order another batch of I/O with PCBWay (in 1-2 weeks), should I wait for the v5.3 or you think it will be ready in a distant future and just go with the 5.2 for now?

Thank you
Cyril

[Sorgelig]

v5.3 is not ready. Currently there is no fundamental changes between 5.2 and 5.3. Most users won't see the difference. It's more or less polishing the design. I have some ideas for more changes, but still unsure.
So, use 5.2 for now.

[cvenditti]

Good, thank you
Cyril

[ijor]

Somebody sells a fully assembled I/O board?

[kolla]

I have an IO board, but to be honest I have not used it for anything than enjoying the Blinkenlichten

Silly question I'm sure - is there some user guide somewhere, something that explains what the ports, jumpers, pins and jumper are there for, and how to use them? Can for example the A1200 LED connector be plugged directly into the LED port?

[Sorgelig]

Somebody sells a fully assembled I/O board?

You need to ask in buy/sell thread. Sellers probably won't see your request here. This thread is for technical discussion.

Silly question I'm sure - is there some user guide somewhere, something that explains what the ports, jumpers, pins and jumper are there for, and how to use them? Can for example the A1200 LED connector be plugged directly into the LED port?

Yes, PDF file with schematics. Connectors for external buttons and LEDs are directly connected to on-board keys/LEDs, so you can see pin connections there.
Actually these connectors are designed exactly for integrating MiSTer into some existing case like A1200. But you need to figure out how to connect specific LEDs/buttons yourself as detailed connections may vary.

[Sorgelig]

iobrd_5.3.png

preliminary version 5.3:
- TOSLink has been replaced by LED on the back of phone jack. Similar solution used in some notebooks. So, to plug TOSLink cable, you just need to use 3.5mm adapter - it's pretty common. This is cheaper solution and doesn't need another hole - so pretty much fits into MiSTer philosophy
- Added serial connection. Actually it's naked FPGA GPIOs. I've just added some standardization for small extensions like serial port. I've used USB3.0 connector as an easier solution. Originally i've planned to use 4x2 header, but it's not convenient and it's easy to shift the connection and fry something. USB plug gives solid connection avoiding any misalignment. But it's not USB of course. Just plug. I've used GND and 5V as on real USB. Other signals also should be ok in case if someone will plug a real USB device into this socket. Socket provides RX,TX,RTS,CTS,DTR,DSR signals but actually it's up to core.
- I2S header in case if someone wants. It's mutually exclusive to analog and TOSLink output.

[Sorgelig]

Just released v5.5:

20180612_001442.jpg

Take a look at the assembled board - this is supposed to be a default set of soldered components. External LEDs/Buttons connector are extremely rare used, so they are not soldered by default. P5 jumper is shorted directly on board and not soldered by default as well. Check PDF file for v5.5 - all components with DNI by default aren't soldered.

Main changes in v5.5 is I/O connector which can be used by cores for serial connection. It's not exactly has to be UART. It can be SIO or other types of connections - depending on cores. It's wise to use the same signal directions as assigned by default - so wrong connectors won't compete by opposite signals.
Total 6 GPIO are output to connector. They can be used even for retro joystick connection.

All signals are 3.3V!