SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492024-03-28T03:11:24-06:00SparkFun Electronicsmarkmoran on COM-09481 - 7-Segment Display - 4-Digit (Blue)markmoranurn:uuid:1f52d308-028f-a5ff-a739-7bd7b9828a5a2015-08-21T18:21:32-06:00<p>I bought this over three years ago and finally have a use for it! I wish at the time I had understood that common anode meant that it wouldn't be compatible with the MAX7219 I bought with it Oh well, gives me an opportunity to use more of the ATmega pins and do it manually.<p>Speaking of which, Nate's 2011 driver code seems like a great start, especially since it doesn't require any resistors. I understand that with fast enough PWM, the LEDs are not on long enough to burn out, but is that also true for sinking or sourcing current from an ATmega pin? i.e. Does this design not require any transistors on the digit pins either? If a pin has a max rating of 40mA, won't the digit pins be sourcing more than that, especially if they are displaying a number 8 for example? In the notes, he says that turning each digit on for 5000 microseconds will draw 15.7mA, but I don't understand how that number is calculated. Thanks for any help!</p></p>
Customer #330608 on COM-09481 - 7-Segment Display - 4-Digit (Blue)Customer #330608urn:uuid:dcca652c-77ad-7f49-cb22-4910e971f6292014-02-10T22:52:53-07:00<p>Can this display be controlled by a Arduino Pro Mini 328 - 3.3V/8MHz? Does the 3.3V arduino board have enough power to drive it?</p>
RyeMAC3 on COM-09481 - 7-Segment Display - 4-Digit (Blue)RyeMAC3urn:uuid:0e414777-a9fe-8d9b-328a-0bce780025372014-01-29T19:36:06-07:00<p>Why is the white $1.95 and the blue $2.50? The white is basically a blue with a white filter over it. (If you look at the back of the white one when it's on, you can see it glowing blue.) So it cost's 55 cents more to not put the filter on it??</p>
Customer #376346 on COM-09481 - 7-Segment Display - 4-Digit (Blue)Customer #376346urn:uuid:5d551144-82e6-5686-629e-d4c0914842db2013-10-05T21:52:51-06:00<p>Hi, I have been using the Serial_7_Segment_Display_Firmware sketch, and I cannot make any sense of the output.<p>When I run the code as-is, my display looks like this: http://imgur.com/UmmWysg</p><p>I have tried a lot of things, including replacing my loop to display a whole bynch of ints, none of which I can make sense of on the display. There are a few segments that never light up. Is my display broken? Is there a coding solution to this problem?</p><p>Thanks</p></p>
Customer #276334 on COM-09481 - 7-Segment Display - 4-Digit (Blue)Customer #276334urn:uuid:482bc06f-4c7a-ef35-6fa3-b84d186d4f3e2012-04-13T06:12:18-06:00<p>Fellow 13375, hackers, and hobbyists-
These displays ROCK! after utilizing them in several prototypes, i only had 1 gripe-THE WIRES! Between multiplexing the segments together, power, and communication - it can get pretty ridiculous, ergo, i humbly submit for your approval, my contribution to the cause.<br>
http://www.kickstarter.com/projects/813180812/8-digit-7-segment-breakout-board
Here's to Open Hardware. If you wanna grab a copy of the eagle files i can get you a link. -b3457</p>
EvilGenius121 on COM-09481 - 7-Segment Display - 4-Digit (Blue)EvilGenius121urn:uuid:7ee71709-491f-c72d-7e30-9c67608df9072011-03-11T16:06:13-07:00<p>If anyone wants some extra code or wants do make a clock with an arduino I made a project on instructables with this display<br>
http://www.instructables.com/id/TimeDuino-Arduino-based-clock-using-7-segment-dis/</p>
orcinus on COM-09481 - 7-Segment Display - 4-Digit (Blue)orcinusurn:uuid:a3007657-ddf6-021f-670c-9dc0294d85452010-12-29T19:41:07-07:00<p>This is what it looks like in action (direct-driven, w/ 330 Ohm resistors):<br>
http://www.youtube.com/watch?v=HbTW_QWEx6s</p>
dustinandrews on COM-09481 - 7-Segment Display - 4-Digit (Blue)dustinandrewsurn:uuid:36f3475b-72d6-1156-4550-bb2334fb9c9d2010-08-30T14:35:49-06:00<p>You can't charlieplex the display due to a single common anode. If you want to be able to control all the lights, you will need like 14 pins to do so.<br>
In theory you could drive a display like this with just 5 pins if it was made out of individual LEDs.</p>
RobertC. on COM-09481 - 7-Segment Display - 4-Digit (Blue)RobertC.urn:uuid:39ddd183-cdcc-edda-c51e-b71e0b379cc42010-08-24T09:16:55-06:00<p>YSD-439AB4B-35. It's in the datasheet.</p>
LJC41 on COM-09481 - 7-Segment Display - 4-Digit (Blue)LJC41urn:uuid:947cf217-ad7b-1a6b-269a-94806fdcd8b12010-08-24T09:13:30-06:00<p>anyone know he manufacturer part number?</p>
JohnBoxall on COM-09481 - 7-Segment Display - 4-Digit (Blue)JohnBoxallurn:uuid:a9919241-f89e-7ab7-fbaa-5345c46505492010-07-07T02:43:30-06:00<p>These are very clear and easy to use, for a demonstration please visit: <a href="http://wp.me/pQmjR-zL" rel="nofollow">http://wp.me/pQmjR-zL</a></p>
ahmad on COM-09481 - 7-Segment Display - 4-Digit (Blue)ahmadurn:uuid:022cb810-433f-8403-3a88-e26e881fe0522010-02-22T17:29:58-07:00<p>Turinturambar88,<br>
Thanks for the great info. I did manage to get this working and your advice is dead-on.<br>
I have posted my code and so have a few others on my arduino forum topic here:<br>
<a href="http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1265669651" rel="nofollow">http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1265669651</a></p>
turinturambar88 on COM-09481 - 7-Segment Display - 4-Digit (Blue)turinturambar88urn:uuid:d8eef53b-b441-db90-8c20-b9d3f76e7ad52010-02-12T19:58:14-07:00<p>ahmad,<br>
I just got one of these in the mail, and I'm starting to get it to work. I'm using an atmega48, and I connected PORTD to the display with LED_A-PORTD0...LED_G-PORTD6. You can find a table of bit encodings at the bottom of <a href="http://en.wikipedia.org/wiki/7_segment_display" rel="nofollow">http://en.wikipedia.org/wiki/7_segment_display</a> and store them in an array (use the gfedcba column, but invert the values because the display is common anode, i.e. led_digits[0] = ~0x3F;). If you set PORTD to one of those values, and then set one of the Digit # pins on the LED high, you should see that value on that digit. You'll have to rotate through turning the different digits on and off quickly to set different values on each. I'm new at this, so if there's a better way I'd love to know, but hopefully this helps some.</p>
ahmad on COM-09481 - 7-Segment Display - 4-Digit (Blue)ahmadurn:uuid:40882034-d4d3-74d6-8e3a-e9a654e02d102010-02-09T10:09:04-07:00<p>Hey sparkfun and community,<br>
I was wondering if anyone could direct me to a good tutorial for using these particular displays.<br>
Or could someone who got them working please provide some sample code and description of schematics?<br>
Thanks!</p>
jhu on COM-09481 - 7-Segment Display - 4-Digit (Blue)jhuurn:uuid:45cd2b7b-1026-733c-f5ab-3ca95ac59d2e2010-02-02T12:46:11-07:00<p>they really need to dump this on one of those serial display boards w/ the atmega168</p>
TheMoogle on COM-09481 - 7-Segment Display - 4-Digit (Blue)TheMoogleurn:uuid:6c3791c3-3994-7672-2463-2590131cb6392010-01-12T13:11:52-07:00<p>not compatible with the Capacitance Meter DIY Kit X_x as i just found out</p>