What's new

BladeZX

Grand Master
Joined
Jul 11, 2019
Messages
592
Reaction score
449
Location
Canada
I have one but I am in Canada
Cannot wait for this multi so I can test out my selector pcb
 

hyp36rmax

Grand Master
Joined
Oct 6, 2018
Messages
509
Reaction score
709
Location
USA
Holy shot just reading up on S18 this is dope! Just picked up MoonWalker, time to look into a S18 donor for this.
 

PachinkoUK

Beginner
Joined
Jan 24, 2016
Messages
16
Reaction score
6
Location
UK England London
Is there anyone in the USA that can test a s18 proto EXTENSIVELY for a week and send it back?
Hi there
Here in the UK I can test the prototype pcb no problem and post it back to you very happy to pay for postage etc
You guys are amazing thank you kind regards Ryan
 

bodgit

Enthusiast
Joined
Sep 6, 2020
Messages
114
Reaction score
226
Location
UK
I had a quick go at making my ESP-based selector fit the proposed header pin layout. The fact that this multi will be 3.3V already means I no longer need components like the voltage regulator and level shifter so I can shrink the PCB size a little bit. Here it is rendered with matching diarrhoea-yellow soldermask:

s18-selector.jpg


Here's the underside of the PCB with the sockets:

s18-selector-rear.jpg


It looks like the rotary switch on the multi is south of the header pins and would therefore be underneath my selector. Do you know yet what part that will be and how tall it is? Also, roughly how much current will be available from the 3.3V supply pin?
 
A

Apocalypse

@bodgit we have actually changed the design since the first protos, but the selector is still south of the header pins. Rotary switch is a PT65-503.
The 3.3V rail can supply 1A (I even think the regulators installed by @Mitsurugi-w are 1.2A but he would need to confirm that). Anyway worst case scenario the multi draws 0.3A so you have plenty of slack.

[EDIT]
And there's a tricky thing, reset signal is still 5V so it would need to be tristate on your selector (either in high impedance or low).
 

bodgit

Enthusiast
Joined
Sep 6, 2020
Messages
114
Reaction score
226
Location
UK
@bodgit we have actually changed the design since the first protos, but the selector is still south of the header pins. Rotary switch is a PT65-503.
The 3.3V rail can supply 1A (I even think the regulators installed by @Mitsurugi-w are 1.2A but he would need to confirm that). Anyway worst case scenario the multi draws 0.3A so you have plenty of slack.

Ah, PT65-503 is the same family of switch as those used on the rotary selectors so I can find the height of those easily enough.

Sounds like there's plenty of power headroom, I think the maximum current draw of the ESP8266 is somewhere about 170mA but I think that's largely dependent how the WiFi is configured.

[EDIT]
And there's a tricky thing, reset signal is still 5V so it would need to be tristate on your selector (either in high impedance or low).

I know it's a pain but is it possible to get/add a 5V supply pin, i.e. the Vin used for the 3.3V regulators? The ESP pins aren't 5V tolerant, the SPST switch chip I'm using can only handle logic between 0-Vin so if it's powered by 3.3V it won't like the 5V reset signal, but if powered with 5V can handle both the reset signal and the 3.3V dipswitches.
 
A

Apocalypse

I know it's a pain but is it possible to get/add a 5V supply pin, i.e. the Vin used for the 3.3V regulators? The ESP pins aren't 5V tolerant, the SPST switch chip I'm using can only handle logic between 0-Vin so if it's powered by 3.3V it won't like the 5V reset signal, but if powered with 5V can handle both the reset signal and the 3.3V dipswitches.
Maybe you could use a single gate like 74LVC1G125:
https://www.ti.com/product/SN74LVC1G125
 

Mitsurugi-w

Arcade Admini-Moderator
Staff member
Legendary
Joined
Jun 12, 2015
Messages
6,786
Reaction score
6,520
Location
New Bern, NC USA
Only thing stopping it is sourcing parts. Flash suppliers keep trying to fuck us over.
 

Darksoft

Staff member
Immortal
Joined
Jun 12, 2015
Messages
9,471
Reaction score
11,565
Location
Poland
Damn, not good. I'm sure you have a couple of nice stories to tell.
 
Top