ERC errors

[Anonymous]

Hello,

I have designed a schematic, which interfaces the microcontroller with the sensor by I2C. I don't find the microcontroller and sensor IC in the existing library. I have downloaded the individual IC from samacsys search library and added it to the eagle library. After connecting them by using net I was getting these errors.

1. Only INPUT pins on net N$1. 

2. Only INPUT pins on net N$2. 

Do you have any idea of these errors? 

Thank you 

D.Vishnu 

[one-of-the-robs]

There are two likely reasons for getting those errors:

1) You've connected them up wrongly on the schematic

2) The libraries you've found on samacsys are poorly designed or just plain wrong

My betting is on the second, Every library I've ever obtained from anywhere like that has been wrong. Sometimes, just occasionally, they're close enough to provide some useful basis to start from when creating a correct library. More often, though, the time taken to find, download, inspect, debug and finally fix such a library is more than it would have taken to create a correct one from scratch. Which is why my recent sample size for the above statement is not mathematically significant, of course.

Cheers,

Rob

[Anonymous]

Thank you for clarification. 

In eagle is there any option for creating a component by our self and adding to the existing library? 

If so please tell me where I can find it.

Thank you

D.Vishnu

[one-of-the-robs]

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@Anonymous wrote:

In eagle is there any option for creating a component by our self and adding to the existing library?

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Of course! That's rather a fundamental feature for an ECAD tool.

From the control panel, you can see all the libraries in the standard search path. You need to make sure you have a writable directory in that path (Options->Directories) and put all your custom or modified libraries there. You can then open any of those libraries in the library editor, just by double-clicking. Once in the editor, you can open individual symbols, packages and devices, or create new ones, and draw or adjust as required.

There are plenty of tutorials on this - in the Eagle documentation installed as part of the package, on the Eagle part of the Autodesk site, on YouTube, and no doubt elsewhere on the web.