Search found 30 matches
- Fri Jun 08, 2007 2:07 pm
- Forum: General Discussion
- Topic: FPGA vs Microcontroller
- Replies: 3
- Views: 3716
FPGA vs Microcontroller
I am wrapping up my first digital design class which used the Nexy’s FPGA. Unfortunately the professor never got into practical applications or real world scenarios. I am curious as to how FPGA’s and similar devices like CPLD’s are used in industry, and why they would be chosen over microcontr...
- Sun Oct 29, 2006 7:54 pm
- Forum: General Discussion
- Topic: Coil Direction
- Replies: 2
- Views: 1781
Coil Direction
If the direction of the windings in a coil is reversed the magnetic field is also reversed. For example if the windings in a motor are taken out and reoriented in the opposite direction then the motor will spin the opposite direction. Why is this? Isn't the relative direction of the current still th...
- Sat Nov 19, 2005 11:43 pm
- Forum: General Discussion
- Topic: 5VDC from household light switch
- Replies: 15
- Views: 5943
5VDC from household light switch
I have a need for 5V DC in an area where only a light switch is handy. Is there a safe way to hook up a transformer to the wiring on the switch?
- Wed Oct 12, 2005 9:45 pm
- Forum: General Discussion
- Topic: Vertical Jump tester
- Replies: 14
- Views: 5712
Re: Vertical Jump tester
These types of sensors (accelerometer, speaker, shock sensor) will be able to determine when the person jumps?
- Wed Oct 12, 2005 12:17 am
- Forum: General Discussion
- Topic: Vertical Jump tester
- Replies: 14
- Views: 5712
Re: Vertical Jump tester
Where would you mount the accelerometer?
- Tue Oct 11, 2005 11:05 pm
- Forum: General Discussion
- Topic: Vertical Jump tester
- Replies: 14
- Views: 5712
Re: Vertical Jump tester
Do you have any recommendations for a well-valued microcontroller starter kit? Also, philba, can you elaborate on your accelerometer set up? I haven’t ever worked with these devices and don’t quite follow what goes where.<p>[ October 11, 2005: Message edited by: JohnT ]</p>
- Tue Oct 11, 2005 12:21 am
- Forum: General Discussion
- Topic: Vertical Jump tester
- Replies: 14
- Views: 5712
Vertical Jump tester
I would like to build a vertical jump tester like the one in my school’s weight room. This works by having the person to be tested step on a pressure sensitive pad. When the person jumps, the pad triggers a timer that stops when the person lands on the pad. A small computer determines the max height...
- Mon Oct 10, 2005 12:13 am
- Forum: General Discussion
- Topic: I am claiming dunce of the week
- Replies: 44
- Views: 19579
Re: I am claiming dunce of the week
As far as the electrolysis goes I doubt that you were actually passing 20 amps through the water. If you were, you would be making hydrogen at an incredible rate; however using the electrolyte of baking soda there would be a high resistance in the water. If you were forcing this much current through...
- Tue Sep 06, 2005 1:33 am
- Forum: General Discussion
- Topic: RF Signal strength to measure distance
- Replies: 21
- Views: 12268
Re: RF Signal strength to measure distance
I had found the AGC on the chip that handles the FM part of the radio, but it only worked for the FM. However, it doesn’t matter now because I have somehow managed to short something out and neither part of the radio seems to work (this is the second radio I have killed in this way). I’ll have to ma...
- Sat Sep 03, 2005 11:24 pm
- Forum: General Discussion
- Topic: RF Signal strength to measure distance
- Replies: 21
- Views: 12268
Re: RF Signal strength to measure distance
Sorry jwax for my lateness, I was at a football game all of yesterday. <p>No, I’m not locked onto 1785khz. For testing purposes I am using the local oscillator of an AM radio with antenna attached as a transmitter. By adjusting the tuning capacitor of this radio I can change the transmitted frequenc...
- Thu Sep 01, 2005 10:46 am
- Forum: General Discussion
- Topic: RF Signal strength to measure distance
- Replies: 21
- Views: 12268
Re: RF Signal strength to measure distance
Yes, this is a go-no go type of setup as you word it. I was hoping that with a low enough power transmitter there would be enough distance between “x” and “x+2” for a difference to be discerned. <p>The part number on the IC is ANZ024, which I haven’t been able to find a data sheet on. There is more ...
- Thu Sep 01, 2005 12:00 am
- Forum: General Discussion
- Topic: RF Signal strength to measure distance
- Replies: 21
- Views: 12268
Re: RF Signal strength to measure distance
Thanks Chris for the warning, but I may have miss worded my last post. I do not intend for this to be an accurate means to measure distance over the range of 1 to 2 meters, but rather to be preset so that the measured field strength at an arbitrary distance (about 1 yard) activates the buzzer or som...
- Wed Aug 31, 2005 9:08 pm
- Forum: General Discussion
- Topic: RF Signal strength to measure distance
- Replies: 21
- Views: 12268
Re: RF Signal strength to measure distance
Sorry for neglecting to tell you the distances I am thinking of are within a range of 1 and 2 uninterrupted yards. Thanks for the advice about the AGC. It sounds like it should be perfect. Do you have any idea where I might find the physical location of this stage on a standard radio? The radio I ha...
- Wed Aug 31, 2005 1:07 am
- Forum: General Discussion
- Topic: RF Signal strength to measure distance
- Replies: 21
- Views: 12268
RF Signal strength to measure distance
While we are on the topic of RF, I thought you might be able to help me with an idea I’ve been brainstorming. That is to use the relative signal strength received of a low power transmitter to determine distance. <p> If a small, low powered transmitter were attached to a moving object, then a statio...
- Fri Aug 05, 2005 6:23 pm
- Forum: General Discussion
- Topic: Problem with Hall sensor
- Replies: 7
- Views: 5079
Re: Problem with Hall sensor
Sorry Edd, I haven’t been online for a while; <p>I’ll try to answer your questions the best I can, your knowledge of the physics of this kind of thing seems far beyond my own... <p>The only reason I am using the different hall sensor is that it is easier to purchase in small quantities. In compariso...