Hi,
Im getting these strange errors while doing the ERC error check in my schematic, and I have no idea how to get rid of them, as shown in the picture.
http://i55.tinypic.com/i5x7kl.png
higher quality
http://i55.tinypic.com/i5x7kl.png
Errors are
(No Supply for Power pin)
Can anyone help me so I can fix them; I am still learning how to use Eagle.
Thank you for your help.
just click “approve”, eagle will remember what you’ve already approved so next time you check, it won’t show the same errors
So they’re just errors I can ignore? Do they mean anything?
The individual that created that library part in Eagle specified that pin as a power pin, generally all power pins need to be connected. Check the datasheet and make sure.
ah ok, I figured it out, thanks!
UNTEngineer:
Hi,Im getting these strange errors while doing the ERC error check in my schematic, and I have no idea how to get rid of them, as shown in the picture.
http://i55.tinypic.com/i5x7kl.png
higher quality
http://i55.tinypic.com/i5x7kl.png
Errors are
(No Supply for Power pin)
Can anyone help me so I can fix them; I am still learning how to use Eagle.
Thank you for your help.
Power Supply pins NEED TO BE CONNECTED! Both GND1 and GND2 must be connected to the same GROUND as the other chips in your schematic. Additionally, 5V pins need to be connected to 5 volts and the 3V pin needs to to connected to 3 volts. Your circuit will NOT WORK with these errors!
Ive connected all the grounds and Vcc’s together, but why do I need to bother with the 3V? I dont have anything on the board powered with 3V, and I dont really want to add an additional lm317 on the board to connect to that pin…can I just connect it with the 5V and forget about it?
UNTEngineer:
Ive connected all the grounds and Vcc’s together, but why do I need to bother with the 3V? I dont have anything on the board powered with 3V, and I dont really want to add an additional lm317 on the board to connect to that pin…can I just connect it with the 5V and forget about it?
Well the data sheet will tell you what pins are connected to power (+5v & +3v) and ground. Connecting a +5v pin to a +3v pin would likely destroy the part. What is its part number? If this is a USB chip, then +3v may be an output and not a power input. BTW, I didn’t see any pin numbers on the part. Whoever designed this part in EAGLE should have had pin numbers turned on. The pin #'s may show up in the schematic if layer 93 (Pins) is turned on.
To me that LOOKS like an arduino or an arduino shield implemented as a part.
If so, the 3.3V pin is an OUTPUT, and if you aren’t powering anything using it, you don’t need to connect to it. definitely don’t supply your own 3.3V if it is a shield.
The 5V pin is similar, although you can power the arduino using your own regulated 5V source if you want.
yea thats right its an Arduino shield. Im using the default shield that comes in the Adafruit library.
Cool. Solved then.
If you don’t have anything that needs to be supplied with 3.3V, don’t connect anything to the 3.3V pin.
If you don’t have anything that needs to be supplied with 5V, and you are powering the arduino through its barrel jack, don’t connect anything to the 5V pin.
Probably whatever you have on the shield will need to have it’s ground connected to the arduino ground (so they are “common”). You can do this through any of the pins labelled ground - you could connect to just one (any one) or all of them if you want.
