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Topic: SINGLE 3 DIGIT 7 SEGMENT LED (Read 21209 times) previous topic - next topic

cupstacker

18 is empty - i'm not using 18 at all

Quote

PIN                              Max7219
1 = E                         21
2 = D                      23
3 = DP                      22
4 = C                      20
5 = G                      17
7 = B                      16
8 = common      6
9 = common      11
10 = F                      15
11 = A                      14
12 = common      2

DIN - 13
clock - 11
load - 10

max - 4 & 9 ground
max - 19 power with resistor

that's how i have it wired


as stated and shown earlier

arduinodlb


ps
and yes, we know we are getting help for free, we all know this - i wish people would stop rubbing that into new people's faces already. we appreciate the help, but that doesn't mean we can't vent at times.


Actually, yes it does. You need to walk away for a few hours and calm down. Just because YOU can't get it to work doesn't mean you can vent on US. Go face a mirror, vent at yourself, then come back and consider the way you are approaching people who are trying to help you.
Do not IM me. I will not respond. Ask questions in the forum.

nickgammon


@ nick - anodes.. already been mentioned, ...


Well, glancing back up the page:

Quote

... as far as AX or BX i do not know ...


I want you to know, and if you don't, find out. Measure it, like I suggested.

Having things not work until you get everything right is actually quite normal. There must be dozens of projects where I try things, and the gadget stubbornly displays nothing, or the wrong thing. I then carefully check everything. Wiring, sketch, datasheets. Then if that doesn't show the problem I start measuring things. Remember, there may be more than one thing wrong. It might not be a case of someone not noticing the wrong wire. You might have a wrong wire and a bug in your code.
Please post technical questions on the forum, not by personal message. Thanks!

More info: http://www.gammon.com.au/electronics

nickgammon


18 is empty - i'm not using 18 at all


Well it's not supposed to be empty. Reply #50 showed a resistor. I showed a resistor. You have to use it.
Please post technical questions on the forum, not by personal message. Thanks!

More info: http://www.gammon.com.au/electronics

cupstacker

Quote

I want you to know, and if you don't, find out.


i gave you all the info, where it was bought, who it was bought from what it's description is, contacted the seller and posted what they gave me. i cannot tell you anymore than that.. sorry.

i have given a diagram of exactly how it is connected, shown pictures, described in writing.. what more can i do? i caught the code error and changed that.. and all i see is 888 lit up.

i'm just going to go buy 2 different ones from radio shack or somewhere.. obviously these aren't going to work.

and no i don't have a multimeter.. not going to buy one either just for this..

cupstacker

why on earth would you need a resistor on a pin that is not even being used? :smiley-roll:

but ok, to ground i assume?

arduinodlb

#66
Dec 01, 2013, 08:52 pm Last Edit: Dec 01, 2013, 09:00 pm by arduinodlb Reason: 1
Quote from: cupstacker

yer funny.. like you never got aggravated or pissed off in the heat of the moment and didn't vent right there and then at whatever it was and let others know about it in your whole.. i find that hard to believe


I do NOT appreciate personal messages sent to me like this.

Your behaviour and attitude on this forum is frankly unbelievable, and certainly inappropriate. I am done helping you.
Do not IM me. I will not respond. Ask questions in the forum.

AWOL

I'm finding it hard to believe that it takes 67 posts to get a three digit display to not work.
Cupstacker, a multimeter costs less than a bottle of wine, and you don't need to be 18 to buy a multimeter.

nickgammon


why on earth would you need a resistor on a pin that is not even being used?

but ok, to ground i assume?


Don't assume, read what we post!

I gather from that statement that you have no plans to look at the schematics that either I posted, or CrossRoads posted, but are going to sit there and complain. It isn't being used until you put the resistor there! And the circuit clearly shows it going between the pin and +5V. In my diagram it was a 33k resistor. So you are not paying attention.

It's not our fault if you bought a part that doesn't work, and it's not our fault if you won't read the schematics.
Please post technical questions on the forum, not by personal message. Thanks!

More info: http://www.gammon.com.au/electronics

nickgammon

That's enough, thread locked.

Insulting people who are trying to help you isn't useful.
Please post technical questions on the forum, not by personal message. Thanks!

More info: http://www.gammon.com.au/electronics

CrossRoads

Oh, you've got a Mega.  Need to use the Mega SPI pins - someone posted earlier what they are.

I see the big problem as this: You've indicated that you have a Common Anode display. MAX7219 only works with Common Cathode.
So, find a common cathode part.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

nickgammon

Related thread:

http://forum.arduino.cc/index.php?topic=202214
Please post technical questions on the forum, not by personal message. Thanks!

More info: http://www.gammon.com.au/electronics

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