-------- Original Message -------- From: Christopher Havel laserhawk64@gmail.com Apparently from: arm-netbook-bounces@lists.phcomp.co.uk To: Eco-Conscious Computing arm-netbook@lists.phcomp.co.uk Subject: Re: [Arm-netbook] modifying a 7 inch notebook cabinet to accept apccard Date: Fri, 26 May 2017 12:34:18 -0400
You use the Arduino IDE to program Teensies, IIRC. They might also have their own. Code is uploaded directly to a USB port on the Teensy. Have a look around --> https://www.pjrc.com/teensy/
You *probably* need a Teensy++ 2.0. That is not a guarantee, just a
1 teensy for the keyboard and 1 teensy for the touchpad?
Are there not simpler microcontrollers?
recommendation. I have not myself played around with Teensies, they're expensive (relative to Arduino Nano/Micro clones on eBay, and to my typical budget) and I tend to think in hardware terms far better than anything software/firmware. I can't really help you beyond what I've just written.
The computer doesn't 'see' keymapping. The computer sees a string of information that tells it what key was depressed and released and when. "Keymap" is where the key is in the matrix, which the computer doesn't care about. The computer cares that you pressed the ESC key and released it x number of microseconds later, not that it's row 1, column 1 in the matrix.
It seems to be too complicated.
You should look up the USB HID protocol and the PS/2 keyboard protocol. Those will tell you a lot of how the computer 'sees' and 'talks to' a keyboard... and how the keyboard 'talks' back.
On Fri, May 26, 2017 at 12:27 PM, ronwirring@safe-mail.net wrote:
-------- Original Message -------- From: Christopher Havel laserhawk64@gmail.com Apparently from: arm-netbook-bounces@lists.phcomp.co.uk To: Eco-Conscious Computing arm-netbook@lists.phcomp.co.uk Subject: Re: [Arm-netbook] modifying a 7 inch notebook cabinet to accept apc card Date: Thu, 25 May 2017 17:40:52 -0400
Keyboard is easy if you know a little electronics. A laptop keyboard is
a matrix keypad. Rows and columns. One key connects one row to one column.
Look up a little thing called the "Teensy" -- it is a microcontroller
board. You can (if you are very good at soldering) connect from the keyboard's PCB connector (cut the
Can the teensy make the key mapping correct and the key mapping will be correct when arriving at the computer's usb port?
PCB and solder to the connector while it's still on there -- no shorts, mind you, or it won't work, and the pin pitch is usually insane...) to a Teensy and make a "custom keyboard" that way. You will of course have to program the Teensy but that's the easy part ;) an Arduino Leonardo clone from eBay (also try to find, if you still can,
Can you use a raspberry pi 0 to program a teensy?
"Arduino Micro" clones -- NOT the "Pro Micro" ones, they won't have enough pins). Same code will run there and work just fine.
Forget the battery, unless you have a reflow toaster oven (or other
homemade reflow equipment, or access to the professional gear) -- you will need it for the kinds of chips that let computers talk to batteries, AFAIK. Too much trouble.
I am designing, for a competition on Hackaday, a "made from common
modules" "laptop" that I'm calling the AnyTop. The goal is that anyone can build it if they can use a screwdriver, knife, and some sort of drill. (The drill is only needed in one place.) It won't have a battery... but it will be a laptop form factor and it will work. Luke, would some discussion of this be on-topic?
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Respectfully, if you can't understand the protocol, you're out of your depth and need to tackle something simpler and build up to this. Take the scenic route, it will reward you better. Trust me -- I speak from experience on this -- you'll wind up with a half-completed project that doesn't work and you don't know why. I have a dozen or so of those in my past.
As for the Teensy... yes, one for mouse, one for keyboard. Use a touch panel for a small LCD for the touchscreen. There's really no way to combine them without getting into proprietary chips from eg Holtek -- and since those chips are proprietary and therefore expensive and hard to get, you're thankful that you can use a pair of Teensies ;)
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