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If I am allowed to promote my own product here I would like to give another option. My series of I/O boards (www.brightan.com) would allow you to have from 1 to 127 boards, each automatically networked together, and each board allows you to choose the firmware that it runs, which, in turn...

It all depends on what kind of cables you are running and what the signals are. Coax and especially quad shield coax are not going to be bothered by hv cables. Cat5/6 running Ethernet use differential drivers designed specifically to eliminate noise so I really wouldn't worry too much about...

The unit I was playing with (and I have long forgotten what it was from) was a completely integrated system, 12v in, built in wire heater system with calibrated analog output.

one of the links mentioned had a suggestion to use a automotive air flow sensor and I would echo that. I played with one a few years ago, you just add 12vDC and you get an analog output and it is calibrated for CFM. It doesn't get much easier than that.

If you can set up an account with an electrical wholesaler, or find somebody that has an account that you can use, you might find their prices are as good as anywhere and you might find somebody locally. I use Eecol Electric in Alberta but they only go as far east as Ontario. Over the years I...

I've done higher current H-bridge designs for some military stuff and that starts to become a completely different beast but they are controllable through exactly the same micro-controller setup, just discrete power mosfets and large heatsinks. For something like a slow moving winch and that...

just to be clear, you are obviously not under any obligation to buy anything from me just because we have been discussing it here. It is a useful exercise in real world applications of a potential new board and your application is an interesting one! My intent wasn't to make this thread into a...

The CAN-4-USB/FX interface that I sell (www.zanthic.com is my primary business, Brightan is my hobby business!) is normally $249 so that is better than the $450 that you found but I realize that some will find it odd that you would need a $249 interface to configure a $200 board but the entire...

Add three more doors! :D Yes they are 12VDC. I am working hard at getting this whole system up on my web page and am hoping to have the initial info up over the next couple of days but here is the over all concept... Each of the boards comes with a 500Kbps network built in, based on CAN...

I am going to follow the same format for my other boards , like this but will have 4 H-Bridge drivers, each capable of 5 amps with current feedback and analog inputs for position sensing and a few extra digital inputs for limit switches or user control. Configuration will include the...

For the most part our main touch screen is powered off. There is a small push button on the front and it fires up in under a second or 2 so it makes sense to leave it off for the 99% time it isn't used. When it is left on for an hour or two, the screen saver runs family pictures.

- 40 feet of cat-5 won't be a problem. Even if the device is drawing a fairly large current and you are getting voltage drop on your cable it just means it would leave less voltage for the device. Your Voltmeter can measure current but only up to 250mA so that won't help you. (does it have a...

sooo, now I have you where I want you... hehehe :) Let me think about this for a day or two and come back with a board and functionality description for further comments.

ahhh, fellow Canuck eh? You could have a sensitivity adjustment or automate it with either a temperature sensor, or better yet, measuring the average current needed and adjusting the threshold as the average changes over time. It all depends on how complex you want to make it!

Do you have any way of checking the current? At very least, checking the voltage with and without the load attached might give an idea of whether the power supply can handle it. It seems to me there are the following possibilities - the current requirement is higher than what is marked - the...

there are fuses that will reset themselves when the current is reduce after it is tripped but the problem with the actuator is that it is possible that it will have your finger pinched like a vice grip in the door and yes, the power has been disconnected but the screw mechanism will still hold...

I have been promising a new series of smart I/O boards for a while now so I hestitate to make any more promises but I do have a bunch of new boards ready to go, I am just working on the documentation and web site right now. One of the boards (in this series of new boards) in the planning...

well...here's one idea. Use a red laser pointer mounted about a 1/2 inch off the wall that shines up the length of the wall (next to the door) to a receiver and then you just have to place your hand (or elbow) against the wall to break the beam and trigger the relay. The red laser would make...

I believe that there are two types of touch switches, the most common being the touch lamp kind and I believe they use the fact that when you touch it your body is acting like a big 60hz antenna and they detect this. I would be curious to know if adding a large metal strip will make them false...

you could look at buying a kit with the parts/circuit board/instructions and build it yourself. The nice thing about most of these kits are that they are low voltage and therefore safer for the DIYer. Some places offer them pre-built and tested as well (if you want to take the fun out of it!)...