Search found 1754 matches

by riden
Tue Feb 23, 2010 7:39 pm
Forum: Wireless/RF
Topic: How do I...? real time data display over the internet
Replies: 16
Views: 2211

You will only need one AJAX session originated by your remote client to your local server. Some way to quickly accumulate data from the sensors and so your local server can dish the data out when required will be needed. If you know a little something about programming, you could roll a simple webse...
by riden
Tue Feb 23, 2010 3:10 pm
Forum: SparkFun Product Questions
Topic: Efficient telephone audio (300-650Hz) fedback mechanism !!!
Replies: 4
Views: 493

I forgot to say, I am feeding square pulses of audio frequency. I think all these problems can be solved by using RC or wein bridge oscillator at audio frequency. Thus replacing square pulses with sine waves. 10k will be replaced with 470 ohm at coupling path. What about my prediction ??? Won't mak...
by riden
Tue Feb 23, 2010 3:00 pm
Forum: SparkFun Product Questions
Topic: Driving 40kHz at 20V from 5V supply
Replies: 40
Views: 8286

You might be on to something, at least I hope so. Kudos for sticking with this project, even though I'm sure it is frustrating at times. I know that sharing your tales helps others as well.
by riden
Tue Feb 23, 2010 2:43 pm
Forum: SparkFun Product Questions
Topic: SN754410E woes
Replies: 11
Views: 2794

Sorry about not answering your question about the braking, but the 754410 does have the internal diodes. The L293D's do not. So you're not completely confused. :)
by riden
Tue Feb 23, 2010 9:00 am
Forum: SparkFun Product Questions
Topic: is there any way to insulate bare wire after the fact?
Replies: 16
Views: 3412

i have tried the sand papper and i think i wana just keel over its to time consuming to do each wire like that.... i would have to doit like 5k+ times Yes, I can see how sanding 5k ends would be a pain. :( I don't think applying some type of insulation is going to be easier than a sanding technique...
by riden
Mon Feb 22, 2010 6:57 pm
Forum: New Product Ideas
Topic: how to find out more about smart antenna
Replies: 3
Views: 627

Try Googling "rca digital converter smart antenna". Apparently these are antennas that can be used in high signal strength areas to address multipath issues. In the analog days, multipath expressed itself as ghosting. These antennas can be electronically rotated and have adjustable gain settings.
by riden
Mon Feb 22, 2010 12:48 pm
Forum: SparkFun Product Questions
Topic: is there any way to insulate bare wire after the fact?
Replies: 16
Views: 3412

...the main reason was its small and will be hardly noticible at a distance unlike using a plastic insolation. I would think dipping uncoated wire into an insulator will be much more noticeable than the lacquer coating on the magnet wire. As esklar81 said, sandpaper is a good choice. I use a fine g...
by riden
Mon Feb 22, 2010 7:57 am
Forum: SparkFun Product Questions
Topic: my wine cooler
Replies: 10
Views: 908

The following should provide better accuracy. I haven't confirmed that the following code is correct Wiring syntax, but you can get the idea. Your clock will drift over time, but maybe this will be good enough for your purposes. The strategy is to set a target one second in the future. In the main l...
by riden
Sun Feb 21, 2010 10:57 pm
Forum: Wireless/RF
Topic: How do I...? real time data display over the internet
Replies: 16
Views: 2211

Do a Google on AJAX. You can set up a web page that will only update the data the changes on the page (i.e., your control) instead of completely refreshing the page.
by riden
Sun Feb 21, 2010 9:52 pm
Forum: SparkFun Product Questions
Topic: my wine cooler
Replies: 10
Views: 908

An external clock would make things a lot simpler and be more accurate in the long run. However, the millis() function should be interrupt driven and you could that value as the indicator for when to flip the seconds. Your current code always increments by one second. Using the millis() would take i...
by riden
Sun Feb 21, 2010 7:41 pm
Forum: SparkFun Product Questions
Topic: my wine cooler
Replies: 10
Views: 908

One problem is that every time cool() is called, you are doing a 2 second delay creating at least a one second slippage. You will get better resolution if you adjust the seconds based on the actual number of milliseconds elapsed.
by riden
Sun Feb 21, 2010 2:05 pm
Forum: SparkFun Product Questions
Topic: 555 mono (restriction on Resistance value)
Replies: 3
Views: 531

Okay, so it out with the 555 and in with the PICAXE. Regarding Eagle libraries, have you checked the Revolution (creators of the PICAXE) site? A Google of Eagle PICAXE libraries will get you here:

http://www.rev-ed.co.uk/PICAXE/pcb.htm
by riden
Sun Feb 21, 2010 1:56 pm
Forum: SparkFun Product Questions
Topic: Driving 40kHz at 20V from 5V supply
Replies: 40
Views: 8286

Here are some thoughts that you may help your debugging. Relative to the CPU clock speed (8MHz?), 45 KHz is fairly low frequency. So I would examine these areas: 1) Your main programming loop is doing something that tickles a register when it doesn't have to (i.e., reinitializing some registers that...
by riden
Sat Feb 20, 2010 9:24 pm
Forum: Wireless/RF
Topic: looking for simplest wireless tech
Replies: 12
Views: 1255

From your first post, it seemed you needed a single point-to-point communication. However, it is possible for multiple XBee devices to talk to the same endpoint, but I haven't had occasion to do that in a real application. Others on this forum, stevech in particular, can give you more enlightened in...
by riden
Sat Feb 20, 2010 8:29 pm
Forum: Wireless/RF
Topic: looking for simplest wireless tech
Replies: 12
Views: 1255

The XBee has multiple inputs which can be either digital or analog and the XBee transmits its id, so I'd think it is a strong candidate unless cost is a major factor for your project.