Thread: Alternative input devices

have alook at the input device this guy made, its pretty crazy.

http://www.bjblaster.com/Epia_Car_Mk...uter_MkIII.htm

Originally Posted by smobot

Has anyone here built an alternative input device, such as http://www.lynxmotion.com/irpd.htm mounted in the dash? I cringe at the thought of having a keyboard or keypad sitting up front, and touchscreens are really expensive. Anyway, something like this little device mounted in an array might be interesting for a basic input device for up/down/left/right/select with no moving parts.

I used a keyboard matrix pcb from an old keyboard, one with the flexible keypad inside. The keyboard matrix has a series of pins and the keypad is connected to these pins. The matrix scans each pin to find out which key is pressed at any time. If you connect any two of these pins on the matrix together you get to simulate a key press -> perfect to be used with momentary push-button switches.
The only problem is that every keyboard has it's own combination of pins for a specific key.. For example on one keyboard matrix F1 key could be made by connecting pin 1 and 2, while on another keyboard it could be pin 3 and 15... but in the end it's not really a problem if you make your car pc software yourself as any key can be mapped to a software function and you don't need to find which combination of pins you need for a specific key.

Space occupied by all this is just that of a small pcb and ps/2 cable and that of your front panel with the push-buttons, but that's just up to you how big you make it etc...

Hope this helps
Zulu

Hi Zulu,

A better solution might be this,

http://www.x-keys.com/custom.htm

Look at the X-Keys matrix board. They have complete documentation. It can also store keystroke or use the supplied macro software.

Just a suggestion that might help others.

Angelica

Originally Posted by zulu

I used a keyboard matrix pcb from an old keyboard, one with the flexible keypad inside. The keyboard matrix has a series of pins and the keypad is connected to these pins. The matrix scans each pin to find out which key is pressed at any time. If you connect any two of these pins on the matrix together you get to simulate a key press -> perfect to be used with momentary push-button switches.
The only problem is that every keyboard has it's own combination of pins for a specific key.. For example on one keyboard matrix F1 key could be made by connecting pin 1 and 2, while on another keyboard it could be pin 3 and 15... but in the end it's not really a problem if you make your car pc software yourself as any key can be mapped to a software function and you don't need to find which combination of pins you need for a specific key.

Space occupied by all this is just that of a small pcb and ps/2 cable and that of your front panel with the push-buttons, but that's just up to you how big you make it etc...

Hope this helps
Zulu

yeah this is what i'm doing atm, i got an incremential rotary encoder switch hooked up, anyone know anything about those??? trying to use girder as the interface

Originally Posted by Nic

yeah this is what i'm doing atm, i got an incremential rotary encoder switch hooked up, anyone know anything about those??? trying to use girder as the interface

Check this out - a new one-handed keyboard from Frogpad

You could mount this in the console between the seats. I'll bet with some practice it's pretty easy to use. USB input too.

Originally Posted by smobot

Check this out - a new one-handed keyboard from Frogpad

You could mount this in the console between the seats. I'll bet with some practice it's pretty easy to use. USB input too.

I was just reading this article at Cnet about that. It is 3x5inches. Unfortunately MSRB is $169.99. A little steep for a keyboard. Next year in the first quarter, they are releasing a bluetooth version.