I'm not understanding why I am getting negative readings.
i get readings between -.03 (LOW) and -3.6 (HIGH)
if it was my leads and it was outputting properly then I would expect the 7 segment display to come on
Binary coded hex,
Because you've got the meter leads the wrong way around?Or with the wrong ground reference?
thanks for not being helpful at all
My black lead is touching GND that is coming from my 5V power supply, which is connected to my breadboard.The red lead is touching the output pins of the arduino, and giving me negative voltages.
So I guess than the problem is that I don't know where to receive a GND signal from the arduino.
that being said I didn't know that LOW volatage of one power supply meant high voltage to another.
When some one comes on and states something impossible is happening and then refuses to believe he is making an error, then a certain amount of micky taking is to be expect.
one thing that should be noted is the power supply isn't connected to the arduino, i was told by my friend that it wasn't needed.It would be tons better if you could post a wiring diagram of your setup, but I suspect your friend might be mistaken.The only thing connected to the arduino is my 7 output wires.Then how is the arduino getting powered?the 5V power supply is connected to my breadboard which is providing a GND for the 7-seg display.I suppose this is where I am going wrong.Should I connect the GND of the 7-seg to the arduino instead of a separate power supply?Again a wiring diagram would confirm the need, but for most situations the arduino ground must be wired to your external power supply's negative terminal as well as to any 7-seg display ground connections.QuoteWhen some one comes on and states something impossible is happening and then refuses to believe he is making an error, then a certain amount of micky taking is to be expect.That is because you didn't post a wiring diagram, so answers are assuming that external wiring was done correctly, which in your case may not be correct. But the statement that an arduino can not output a negative voltage relative to it's ground pin is a fact.I apologize for being abrasive, and i appreciate you helping meAgain you can help us best help you by posting a wiring diagram.The basic rule is if asking about software problem you should post your code. If asking about hardware problems you should post your wiring diagram. If your not sure where the problem might be post both.Lefty
Then how is the arduino getting powered?
i just had to connect GND and +5V on the arduino to my power supply.
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