Retro Gaming part 2

…following on from my previous post (Retro Gaming) I have done a little more to the console…

I wanted to be able to turn the console on and off using the PS1’s power button… the PS1’s switch is actually built into the power supply and the button is just sprung loaded to depress it…

I am no electronics expert but I know enough to read the odd circuit diagram (Drop Controller DIY) and there is some half decent info floating around the interwebs to help…

I’ll post the links at the end but here is the pin out for the larger header on the XU4

Once the XU4 has power connected to it then its in ‘standby’ power wise… you then use a momentary switch between pin 1 (+5v) and pin 12 (PWRON) to turn the XU4 on and off…

That bit seemed easy enough… the other thing I wanted to do was to use an LED to show power was on using the PS1’s power indicator… this seemed a little trickier to sort as my working knowledge of electronics is limited… knew that I needed to find a ‘switched’ output which was easy enough on the Arduino as I can write the software to do that but on this not so much as its running its own OS…

The other issue is that the outputs seem to be only 1.8v which apparently may not be enough to power most LED’s

I then stumbled across a decent post detailing how to switch an LED from the XU4..

Armed with the above info I knocked up a prototype on the breadboard… I used pin 29 for the 1.8v output to the base of the transistor as this is live once the power is on and pin 28 for the ground…

Seems to work ok… I had to change the resistor values to ones that I had kicking about but the were close enough not to make a difference..

Next step was to get it onto veroboard and into the case…

And had to test it of course…

Trimmed the board down a little and fitted it to the case…

Board was a little offset as I was a little limited on where I could drill through the veroboard but it works 🙂

…and of course the ‘blue’ LED (PS1 power led is normally green)… subtle change to suggest there is something a little different about this PS1

One less thing on the todo list… couple more to go… need to rewire the controller ports so they are 1 and 2 rather than 2 and 1…

I still also plan to try and get USB ports mounted into the memory card slots and to make a ‘cover’ to fill the hole where the CD mechanism used to live…

Links:
Odroid XU4 pin out info: https://wiki.odroid.com/odroid-xu4/hardware/expansion_connectors
Power switch and LED info: https://forum.odroid.com/viewtopic.php?f=98&t=28574

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