0
\$\begingroup\$

Is it normal for me to be getting these warnings when I changed the names of the wires? ERC warning

\$\endgroup\$

2 Answers 2

1
\$\begingroup\$

From what I can tell, it appears that a pin on many of your parts is designated to be a POWER connection. This means that Eagle expects that pin to be connected to a Vcc from the supply1 or supply2 library.

If you are connecting power manually using a net not connected to Vcc, then Eagle will give you these errors as the expected POWER connection is not present.

It's just a safety check. In industry you would probably want to designate things properly and connect things according to specifications. In my board I sometimes have nets named 5V, 12V, etc.. and sometimes get these errors as the ICs are not connected to a Vcc (strictly speaking).

\$\endgroup\$
2
  • 1
    \$\begingroup\$ Except it does not make sense to connect power to 7 segment driver output. Looks like a poorly made symbol to me. \$\endgroup\$
    – Jeroen3
    Nov 7, 2018 at 8:30
  • \$\begingroup\$ "Eagle expects that pin to be connected to a Vcc from the supply1 or supply2 library" - there isn't anything special about those two libraries. Eagle is expecting power pins to be connected to a net with the same name as the pin (e.g. if the power pin is called Vcc, it expects it to be on a net called Vcc). Those sorts of warnings should be simply checked through (make sure the power pins are on the right nets) and approved. \$\endgroup\$ Nov 7, 2018 at 8:43
0
\$\begingroup\$

Basically pins in eagle schematic symbols can have different types (e.g. Input [in], Output [out], Power [pwr], etc.).

Any pin that has a type of Power, Eagle is expecting to be connected to a net with the same name as the pin (e.g. if the power pin is called Vcc, it expects it to be on a net called Vcc). If it is not, you will get a warning to let you know. These should be simply checked through (make sure the power pins are on the right nets) and approved.

However, power pins should only be used for power connections (e.g. VCC, GND, 5V, etc.). The fact that you are getting these warnings for the pins of your 7-segment display means that the symbol was not made correctly. Personally, I would edit the symbol and change the type to either passive [pas] or bidirectional [io].

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.