Forum: Chit-Chat
31-10-2007, 11:25
|
|
Replies: 3
Views: 770
phone use after a disaster
I just wanted to remind everyone not to use the phone after a major disaster unless you actually need help. We had a small, but still sizable earthquake in the San Jose, CA area last night. ...
|
|
Forum: Programming
21-10-2007, 01:27
|
|
Replies: 6
Views: 1,300
Re: MCC18 Installer Script
I don't know what your procedure was, but I didn't have any problems on Fedora. I just copied C:\MCC18 from a windows installation. WINE was already installed and the compiler it just worked. I'm...
|
|
Forum: Programming
07-10-2007, 14:33
|
|
Replies: 4
Views: 1,622
Re: PIC bsf instruction
I figured it out.
By default, pins that can be used as analog channels are set to analog. If you want to use them as digital, you have to set them using the ANSEL and ANSELH registers. This needs...
|
|
Forum: Programming
06-10-2007, 22:06
|
|
Replies: 4
Views: 1,622
PIC bsf instruction
After spending the last 3 hours trying to figure out what's going on, I think I need to verify my conclusion because it seems strange to me.
If I set the output of more than one pin, they like to...
|
|
Forum: Electrical
18-09-2007, 16:18
|
|
Replies: 24
Views: 2,924
Re: microcontroller picking up noise?
I figured it out! (mostly...)
It was indeed a ground problem. None of the outlets in the house are grounded. I know that because I personally replaced all of the old 2 prong outlets with GFCI...
|
|
Forum: Electrical
18-09-2007, 12:15
|
|
Replies: 24
Views: 2,924
Re: microcontroller picking up noise?
I emailed the power company, but I haven't gotten a response yet (not that I'm really expecting one). I looked at their power quality info and, from what I can tell, this kind of noise isn't their...
|
|
Forum: Electrical
16-09-2007, 17:18
|
|
Replies: 24
Views: 2,924
Re: microcontroller picking up noise?
If it's running only on the battery, it's fine. However, when I connect the scope (even only the ground), it starts acting up. I just tried a different board (smaller and without a metal back...
|
|
Forum: Electrical
15-09-2007, 15:44
|
|
Replies: 24
Views: 2,924
Re: microcontroller picking up noise?
I hope nobody minds that I revive my own thread.
I've been working on the problem on and off since my last report. To sum it up, I've found nothing. I've gone through the house and tried...
|
|
Forum: Electrical
13-09-2007, 22:21
|
|
Replies: 14
Views: 2,824
rangefinding/object detection
I'm working on a project that requires rangefinding. I was wondering what people's experiences have been with ultrasonics and IR range finders.
The problem is that I need to be able to detect a...
|
|
Forum: Electrical
06-09-2007, 20:39
|
|
Replies: 10
Views: 1,356
Re: data bus
I wasn't as concerned about how much data, but rather how fast I can get the data I want. (say encoders that need to be read at a known time) After thinking about it more, it's probably...
|
|
Forum: Electrical
06-09-2007, 19:02
|
|
Replies: 10
Views: 1,356
Re: data bus
That's sort of the problem I've run into. The I/Os are so heavily filtered that I don't think I'll be able to get a reasonable data rate. I think this problem is a project killer.
|
|
Forum: Electrical
04-09-2007, 13:07
|
|
Replies: 10
Views: 1,356
data bus
Has anyone looking into trying to implement an external data bus for the RC? I've been thinking about it, but I've come up against some big limitations.
The first is that the digital I/Os are...
|
|
Forum: Programming
06-08-2007, 10:55
|
|
Replies: 26
Views: 6,754
Re: IFI Loader Reloaded
The response from my team wasn't as good as I thought it would be. I pretty much just stopped working on it.
|
|
Forum: Electrical
24-07-2007, 11:00
|
|
Replies: 30
Views: 5,232
Re: LMD18201
I was playing with this about a year and a half ago. I made a speed controller based on an L298 and 12F683 (one of the 8 pin PICs). The PIC is essentially being used as an RC PWM to traditional PWM...
|
|
Forum: Electrical
15-07-2007, 01:26
|
|
Replies: 18
Views: 2,360
Re: PWM translates to movement?
I'm not sure I competely understand your question.
The transistor will only heat up when there is current through it (just like anything else). P=IV; no current, not heat. In a MOSFET, all current...
|
|
Forum: Electrical
15-07-2007, 01:03
|
|
Replies: 19
Views: 4,101
Re: HomeMade Motor Controllers
I'm sure that power MOSFETs do have some differences in construction, but that diode is in all MOSFETs; it's part of the way they're built. This diode is called a parasitic because it exists, but...
|
|
Forum: Electrical
11-05-2007, 20:22
|
|
Replies: 11
Views: 1,311
Re: problem with speed controller
What's shutting off? Is the motor just stopping or is the light on the speed controller turning off. If the motor is just stopping, make sure that everything is mechanically alright and that your...
|
|
Forum: Technical Discussion
06-05-2007, 18:25
|
|
Replies: 13
Views: 1,544
Re: making a spherical mirror
If I remember correctly, having a ray come in parallel reflects it toward the focal point. Having a ray come in through the focal point makes it reflect parallel. The sun is sufficiently far away...
|
|
Forum: Technical Discussion
06-05-2007, 15:46
|
|
Replies: 13
Views: 1,544
Re: making a spherical mirror
If you guys watch MythBusters, you may remember the solar death ray some time back. Essentially, they were making a mirror that could focus the sun and burn something. The problem that they were...
|
|
Forum: Technical Discussion
06-05-2007, 14:44
|
|
Replies: 13
Views: 1,544
making a spherical mirror
Does anyone have a technique to make a large spherical mirror? The focal point needs to be in the neighborhood of a foot. If my experiments are successfull, I'll make it bigger (both longer focal...
|
|
Forum: Electrical
08-04-2007, 01:27
|
|
Replies: 8
Views: 954
Re: Servo Controller Power Issues....
In an ideal world, you should be able to power the controller and servos with only one battery. What kind of battery are you using? When you use a single supply, are the servos doing anything, or...
|
|
Forum: Programming
05-04-2007, 00:38
|
|
Replies: 11
Views: 1,173
Re: Program State red blinking
1351's usual procedure for unknown blinking light problems:
1. Cycle power. Eliminates some hardware problems.
2. If that doesn't fix it, load default code. Eliminates problems with your code.
3....
|
|
Forum: Regional Competitions
01-04-2007, 02:13
|
|
Replies: 157
Views: 11,584
Re: 2007 Davis Sacramento Regional
Always a bridesmaid, but never a bride...
1351 makes a habit of losing in the semifinals. It's starting to irritate me. So close, yet so far...
|
|
Forum: Regional Competitions
30-03-2007, 23:14
|
|
Replies: 157
Views: 11,584
|
|
Forum: Regional Competitions
30-03-2007, 20:49
|
|
Replies: 157
Views: 11,584
Re: 2007 Davis Sacramento Regional
Yeah... Why is it that the regionals I'm actually interested in don't have match results posted in a timely manner? I think it's a conspiracy...
|
FIRST has always been less than just a school activity for me and more of a way of everyday life.
- Amanda Morrison [more] 
