ERC error GND help

[renegadecitizen]

i know this question has been asked before
but there are so many answers that its confusing.
I keep getting this ERC error

I tried adding a power flag but it made more errors
how do I fix this?
Id appreciate any help?

[Piotr]

Show schematic with that power flag added.

[paulvdh]

First a small thing:
In your schematic I see a small square near pin 2 which indicates an open wire end.
I also see a junction dot on the connection point of pin 2:

When the endpoint of a wire matches the attachment point of a pin, the connection looks clean.

• No junction dots.
• No open squares.
• No open circles (this is a real error, because in that case the pin is not connected at all.

Keeping your schematic clean by paying attention to these details make your project more reliable and avoids confusion (for you and others who see your work).

---

To Solve / Fix your problem, add a PWR_FLAG symbol to the GND net.
If you place something similar to the screenshot below anywhere on your schematic, the error goes away.

@renegadecitizen

i know this question has been asked before
but there are so many answers that its confusing.

Questions about the PWR_FLAG symbol have been asked and answered many times. Can you explain what part is confusing to you?

[renegadecitizen]

I added a power flag to the ground but now the error is a warning

warning: pins of type bidirectional and power output are connected
I don’t know what it means? can you guys explain it?

[paulvdh]

First:
Fix that ugly thing with the junction dot and the square on the GND pin.

After that:
It is (very likely) an error in the schematic symbol of the TinyPICO Nano (who on earth invented that name?)

Power pins should be defined as power input, and not as bidirecional.

Also note that the first error you posted flags the GND symbol itself, and not the tinypiconano pin.
This is because it is defined as a proper power input pin as it should.

In your second screenshot the error arrow has shifted to the tinypiconano pin and it also expicitly tells you what is wrong with your pin:

To fix it:

1. Press [Esc] to make sure there is no selection.
2. Hover the mouse cursor over the tinymegapinto (Do not press any mouse button!)
3. Press [Ctrl + e] to load te megafemtothing into the schematic symbol editor.
4. Change the pin type of pin 2 to “Power input”.
5. Exit the symbol editor and confirm when KiCad asks you to save the changes in the schematic.

[davidsrsb]

Where did you get the CPU symbol from

[renegadecitizen]

thanks i got it working by editing the symbol
I got the symbol from tinypico.com
thanks for the help