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No0ne / ps2x2pico

USB keyboard/mouse to PS/2 interface converter using a Raspberry Pi Pico
MIT License
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Document cautions regarding current consumption #31

Closed ssokolow closed 2 months ago

ssokolow commented 2 months ago

Given that PS/2 ports are rated for 275mA, that older motherboards originally used non-resettable fuses, that there's no spec requirement for newer motherboards to use resettable fuses, and that some USB keyboards draw so much power that they require two 500mA USB A plugs to stay within specified limits (my brother has one), it'd be a good idea to document the DOs and DON'Ts in that regard.

(In my case, my solution was to hang the Pi (after programming but before soldering), the keyboard I plan to use, the mouse I plan to use, and the USB/VGA KVM switch this whole endeavour is for (my HP t5530 running Win98SE gives Fatal Error 0E if you unplug a USB HID device while it's running), which doubles as a three-port USB hub, off one of those cheap Chinese Charger Doctor voltmeter/ammeter things and I got a maximum observed current draw of 0.17 amps.)

No0ne commented 2 months ago

True! I'll include that in the readme.

No0ne commented 2 months ago

Updated README.md!