Quote:
Originally Posted by Kevin Sevcik
...Don't think for a second that all the analog, digital, PWM, and special serial I/Os that we want are going to come cheap. That kind of hardware will run you atleast another $300. And that's not covering how the heck you talk to the joysticks...
...I think it'd be a bit unsporting if the programming side of the equation suddenly had effectively unlimited hardware resources.
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I couldnt agree more. Just to reinforce, here's a sample price list of just SOME of the stuff you need to interface the CPU with a robot and a remote control pannel:
1) First, the previously mentioned laptop...
$550
2) (1) NI DAQcard-DIO-24 card providing 24lines of digital i/o... NEARLY replaces the 16 digital i/o lines leaving 8 lines of I/O left for pwm...
$199
3) (1) NI DAQcard-6024E card providing 16lines analog input and 8 lines digital i/o (to replace remaining 8 pwm pins)...
$699
4) (opt) To get all the nice brought out pins the FIRST controller has, you'll need a breakout board, two of them, for a total of...
$300
5) (2) USB->Serial converters, one for TTL port to a vision system or other peripheral, one for communication with the radio...
$20
6) (2) XBee-PKG-R RS-232 Radio Modems for communication between the robot and the operator interface...
$218
7) (1) PICDEM HPC Explorer board to make your own Operator Interface...
$59
8) (opt) PC board for breakout of pins from the HPC board to your joysticks n such (optional if you want to make your board look nice)...
$20~50
Provided you have your own joysticks and everything, this brings the sum total of this control system to
$2065 as opposed to the current control system's price of
$1147. I might also add that the components listed above would also need a safe haven in which to rest within the robot, which would add a large amount of weight and fabrication time to robot designs.
Well... that was a fun research project.
C code just because it's lower level doesnt mean it's bad, it just means it lets you operate closer to the actual control hardware than other programming languages. Also, I'd rather have a controller that weighs less than a pound and takes up very little space than a laptop which weighs several pounds and takes up a lot of space. Plus, the premade IFI operator interface pannel makes constructing an OI pannel a whole lot simpler.
Have a good weekend folks,
-q