1011
Post New Requests Here / Re: DONE: a self-scrolling, BPM adjustable html/notepad/text file gizmo
« on: June 05, 2007, 08:54 AM »hmmmmmmmmmmm......but if the switches are in series, won't they all do the same thing??
The switches aren't in series, they'd be hooked up to the microcontroller chip in the same way the keys on the keyboard would be,
but they'd be able to hook into eachother.and if it's an analog signal, would there be an impedance change issue running them in parallell?
One side of the chip is digital (the part that goes into the computer), the other is analog. We don't really have to worry about impedance since these are switches and not, say resistors, or LED's, etc,... we aren't doing anything, we're just switching a logical state.
here a parallel example with just one 'key' :
input
| |
| |
| *_______________
*__|_______________SWITCH
| |
| |
| |
KEYBOARD
Either the two wires short when you push the switch -or- the two wires short when you push a key on the keyboard,
for the input, there is no difference. Maybe i'll look up the details on how they hook up to the microcontroller and make a little schematic and put it up on the bpm notepad website once i have it finished. Though chances are that many keyboards use different types of microcontroller, so it may be different and you may have to 'follow' the lines on the keyboard pcb (or membrane) anyway.-Gothi[c] (March 21, 2007, 11:13 PM)
For any of you reading this that are less electronically gifted, there is always the simple way to do it...use a keyboard splitter. You can get them for less than $5US at most cable supply companies. Just don't use both keyboards at the same time (or in this case the keyboard and the pedal) or you get the same effect as pushing multiple keys at the same time.