Sensor Applicaiton, 12V Style Using Linux: Which Display?

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mgrollman
LCD?
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Sensor Applicaiton, 12V Style Using Linux: Which Display?

Post by mgrollman » Tue Oct 17, 2006 6:03 pm

We are looking to add a small LCD (2 line text fine) to an embedded system w do in the transportation space. The embedded system runs Linux, and has RS-232 ports as well as USB ports on it. We need a few buttons for driver input, although the display and the buttons are less core than the smart monitor function on 12V lines.

We'd like to find an intelligent display that do this, but that also can be used to monitor a few 12V lines (such as ignition and turn signals). On the surface, it would seem like some of the returns on the fan side might be up to this task. It would also seem like the Dallas 1-wire stuff might be able to do the trick. What's harder to figure out is, what is the optimal way, and the optimal model for the application?


In a perfect world, we'd love to use something like LCDP, but I cannot tell what level of support is there for things like 1-wire (if any). We would poll/log the data ourselves, we just need to unit to tell us if a line is high or low when we ask it its state.

Any insight from those who may have traveled the road before would be greatly appreciated.

Cheers,

Jon
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Post by Jon » Wed Oct 18, 2006 4:49 pm

Hi mgrollman,

The LK202-24-USB would easily be able to accomdate displaying information using USB, as well as provide you with a mode of user input with the keypad. However, after that things get a little bit complicated. The 12V GPO's on the LK202-24-USB are designed to accept PWM input from an electrical motor (ie. computer fan). Therefore if the device that you are monitoring on the 12V GPO can transmit information back using PWM, and draws less then 1A of current then we are in business. Otherwise, you might have to use the 1-wire header to read this information, which would likely involve creating a plugin for LCDproc.

--
jon

Edit: If you are not familiar with LCDproc, you can find more information about it here: http://lcdproc.omnipotent.net/

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