I've got 2 usb numpads I need to use in a project I'm working on. The board is Adafruit's Pro Micro and the easiest way to do it is through 2 ps2 adapters. For some reason, one of the numpads isn't seen by the arduino, no matter what I try. I've tried 2 different adapters and know that if connected to a computer via usb the numpad works just fine-I also used it successfully with a Yun connected through usb, so there are no hardware issues. I've tried both ps2keyboard and ps2key advanced, to no avail. Any idea what might be the issue?
In the early days of USB the USB mice/keyboards were often designed to work on either USB or PS/2. The mouse/keyboard would detect the adapter and switch to PS/2 operation. The "PS/2 Adapter" was just a dumb connector adapter. It was the firmware in the mouse/keyboard that detected which protocol to use.
In more recent years the PS/2 capability was dropped and putting a "PS/2 Adapter" on a USB mouse/keyboard will do no good. I suspect that the keypad you can't get to work has newer firmware.
johnwasser:
In the early days of USB the USB mice/keyboards were often designed to work on either USB or PS/2. The mouse/keyboard would detect the adapter and switch to PS/2 operation. The "PS/2 Adapter" was just a dumb connector adapter. It was the firmware in the mouse/keyboard that detected which protocol to use.
In more recent years the PS/2 capability was dropped and putting a "PS/2 Adapter" on a USB mouse/keyboard will do no good. I suspect that the keypad you can't get to work has newer firmware.
Read something similar elsewhere, I guess that's the reason, bummer. Thanks!