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General Category => General Discussion => Topic started by: Carl10r on August 03, 2010, 13:51:43 PM

Title: Eagle Bus Help
Post by: Carl10r on August 03, 2010, 13:51:43 PM
Hi all,

I'm slowly finding my way around Eagle Cad, and as some of the schematics on this site use the BUS feature I was wondering if someone can explain how it works and how to set one up and work out what connections go where from a schematic, preferably using example/s off this site so I have examples to hand?


Title: Re: Eagle Bus Help
Post by: kam on August 03, 2010, 19:00:12 PM
Well, i am not a great fan of buses when it comes to explain where goes where, although the bus is the perfect tool for its job. Let's see an example.

PIC thermometer and thermostat (http://pcbheaven.com/circuitpages/PIC_Thermometer_and_Thermostat/)

This schematic is... not complete. The bus should have labels on each wire to explain where each wire is connected. But that causes a mess, as for example near each wire of the DIS1 i should have add a label to say that pin number x goes to PIC input number y etc etc etc. I hate this labeling. Instead, i usually have a text to explain where each wire is connected. So, if you read the text under the schematic, you will see the connections:

# a1 and a2 goes to pin RC0
# b1 and b2 goes to pin RC1
# c1 and c2 goes to pin RC2
# d1 and d2 goes to pin RC3

The first way that i explained is used most often, but i hate it when there are many wires one close to another. If you have another schematic from PCBheaven that is not quite clear, please tell me to check it.