SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492024-03-29T09:42:35-06:00SparkFun ElectronicsBirdNerd on COM-09935 - 10 Segment LED Bar Graph - RedBirdNerdurn:uuid:31325393-2275-9df1-76bf-334372ad4f692013-12-22T21:14:15-07:00<p>Yes, using "if" statements from the resistance values of the photocell to light up certain led's. If the resistance = this, then turn these led's on.</p>
FMaz on COM-09935 - 10 Segment LED Bar Graph - RedFMazurn:uuid:8ce96887-6641-77b0-3122-fc66e21fd2e02013-06-14T23:28:06-06:00<p>You should sell exactly this, but with resistance built-in.
Would be awesome. I have having to put resistance for LED... it's a waste of breadboard.</p>
532nmIsMyFavoriteColor on COM-09935 - 10 Segment LED Bar Graph - Red532nmIsMyFavoriteColorurn:uuid:0de33c18-c3fd-9c1d-7830-320d4ef3feec2013-05-17T22:01:50-06:00<p>Someone tell me how to right one of these up to a mini photocell or lilypad light sensor so that it roughly measures the amount of light coming in. Is it possible?</p>
MikeGrusin on COM-09935 - 10 Segment LED Bar Graph - RedMikeGrusinurn:uuid:81a080d7-cebb-7496-ea5a-e2cd857eaa5d2013-03-25T11:26:50-06:00<p>There are no resistors in these (so you'll need to add your own); they're just plain LEDs with the cathode on one side and the anode on the other.</p>
Customer #421143 on COM-09935 - 10 Segment LED Bar Graph - RedCustomer #421143urn:uuid:713d4b26-e28b-15d9-fae9-474a9a1b65c32013-03-24T23:43:01-06:00<p>Is there any documentation describing the wiring and implementation of this device? I'm curious about the resistor setup.</p>
Kamiquasi on COM-09935 - 10 Segment LED Bar Graph - RedKamiquasiurn:uuid:58c3a6c7-0f78-8901-b741-ac53f2590cdb2013-03-22T17:38:53-06:00<p>Nope. You could make your own with a bit of green and red plastic (filter) using the 'yellow' bar graph (more flexibility that way, too). But then again, you could just order that type of bar graph elsewhere.</p>
Customer #421437 on COM-09935 - 10 Segment LED Bar Graph - RedCustomer #421437urn:uuid:684b8afb-8c91-fabe-83c6-297567d025492013-03-22T17:21:55-06:00<p>Does Sparkfun have anything that is like the linked bargraphs below?<p>http://www.light-bo.com/products/5-Segment-Multi-colour-LED-Light-Bar-1110624.html and http://www.light-bo.com/products/Super-Bright-Green-Yellow-Red-10-Segment-LED-Light-Bar-1110710.html</p><p>Both seem like really good choices for use with something like the fuel gauge https://www.sparkfun.com/products/10617 that aren't just 1 solid color.</p></p>
MikeGrusin on COM-09935 - 10 Segment LED Bar Graph - RedMikeGrusinurn:uuid:68e5cfc0-be07-0e99-8fc5-fa0b42ea0b472012-11-09T16:57:47-07:00<p>It's basically a blob of epoxy so you'd have to use a saw, but since all the LEDs are separate, it should be possible. Let us know how it works!</p>
LordFawful on COM-09935 - 10 Segment LED Bar Graph - RedLordFawfulurn:uuid:2a19ed4a-5e96-5a6e-15f8-c2d1276156fc2012-11-09T13:53:32-07:00<p>would it be possible to cut one of these down to a different size? say 8 segments?</p>
TavernRock on COM-09935 - 10 Segment LED Bar Graph - RedTavernRockurn:uuid:f3127ed7-66c3-8033-e2f8-d1225962d3002012-06-24T07:36:56-06:00<p>Is it just me or are the anode and cathode pins backwards on the datasheet? After hooking these up it appears pin 1 through 10 should be cathode (GND) and 11 through 20 anode (+V)?</p>
Midknight5000 on COM-09935 - 10 Segment LED Bar Graph - RedMidknight5000urn:uuid:98af5e16-c472-e4dd-44b5-051efc39e7812012-03-13T16:39:07-06:00<p>When will this be back in stock?</p>
exHomunculus on COM-09935 - 10 Segment LED Bar Graph - RedexHomunculusurn:uuid:62b85d2b-5afd-490a-a3c8-c9a2685a3b8a2011-11-28T08:46:19-07:00<p>I've used the <a href="http://www.national.com/ds/LM/LM3916.pdf" rel="nofollow">LM3916</a> with these in the past. It's very similar to the LM3914/15. They all drive 10 LEDs which is a perfect fit. Plus, no need for a uC interface, they can be completely stand-alone.<p>Hook up the RSSI PWM output from an xbee module through a low-pass filter, into one of these LM3916 and you have something pretty cool...</p></p>
Customer #260606 on COM-09935 - 10 Segment LED Bar Graph - RedCustomer #260606urn:uuid:26009628-df88-ced0-3d71-4b181f0750212011-10-21T13:19:18-06:00<p>Thank you</p>
RobertC. on COM-09935 - 10 Segment LED Bar Graph - RedRobertC.urn:uuid:dbd31045-ca88-f181-ff17-82635fc861862011-08-03T10:14:34-06:00<p>Yep, I had that same idea when I was using these for something. We got some and they're on their way. However, they don't sell 10 resistor bussed packs commonly, so we got 5-packs. They have 6 pins in-line and one 'common'. Two of them work well with these.</p>
roycohen2013 on COM-09935 - 10 Segment LED Bar Graph - Redroycohen2013urn:uuid:19dc4b23-7aa3-0d04-043e-2c817b8685672011-08-03T09:47:27-06:00<p>yea resistor packs are actually a really good idea for something like this :)</p>
MikeGrusin on COM-09935 - 10 Segment LED Bar Graph - RedMikeGrusinurn:uuid:2f06e3d1-7b7b-20fa-e6d2-094f0e4903582011-07-05T13:46:56-06:00<p>For anyone still interested, the red bargraph is quite readable (indoors in a brightly-lit office) with a 1K resistor at 5V, which is 3mA through the LED.</p>
CF on COM-09935 - 10 Segment LED Bar Graph - RedCFurn:uuid:0d26fa21-7ad1-846f-e1e1-7894978f82ad2011-05-17T18:43:54-06:00<p>Any chance you will start carrying resistor packs? It would make wiring these things up a ton easier.</p>
orcinus on COM-09935 - 10 Segment LED Bar Graph - Redorcinusurn:uuid:afb6278e-e479-8eb7-6fd1-00c4172566e52010-12-29T19:38:36-07:00<p>This is what it looks like in action:<br>
http://www.youtube.com/watch?v=mxIqXESz5tQ</p>
Kevin Vermeer on COM-09935 - 10 Segment LED Bar Graph - RedKevin Vermeerurn:uuid:d728b6a3-242f-db9b-8739-5251e47f5f052010-12-01T00:59:32-07:00<p>The LM3914 and LM3915 are great analog drivers for these graphs. I'm surprised Sparkfun doesn't carry them, but you should be able to find them without too much trouble.</p>
mct75 on COM-09935 - 10 Segment LED Bar Graph - Redmct75urn:uuid:a5672a88-e7ef-aa36-8403-9b87fd0b2c5e2010-11-17T12:58:34-07:00<p>Do you plan to make/carry an analog-to-bargraph IC? I'd love to have some of these going as analog indicators but I can't have each one eating 10 GPIO. Also, inb4 shift register.</p>
Kevin Vermeer on COM-09935 - 10 Segment LED Bar Graph - RedKevin Vermeerurn:uuid:f721036f-1fa0-c2df-1ebe-f8570559f3462010-07-31T15:36:21-06:00<p>According to the datasheet, the maximum current for these devices is 20mA, or 30mA at a 10%, 10kHz square wave. It appears that you've got these connected to your 5V Arduino with 330 ohm resistors, which would give a current of 15mA (And overload the GPIO ports you've got connected, but OK). Over 10 segments, that's a lot of power dissipation! It's also very, very bright as evidenced by the glow off of the resistors and wires.<br>
This is probably more brightness than I need, and more power than I can afford. What is the minimum current required to get an easily visible graph under indoor lighting conditions?</p>
RobertC. on COM-09935 - 10 Segment LED Bar Graph - RedRobertC.urn:uuid:2d8dfda0-2b8f-df1c-0d62-fc4c172c341d2010-07-21T17:08:35-06:00<p>Good idea. Added to both these and the alphanumeric displays.</p>
rjimenez on COM-09935 - 10 Segment LED Bar Graph - Redrjimenezurn:uuid:d577cd73-b484-08d3-40bb-c0f8a5d21c882010-07-21T15:49:00-06:00<p>IMHO it wouldn't hurt adding "we also carry this in green, blue and yellow" to the description, linking to the respective related products (and do the same, mutatis mutandis, for the other colors) :)</p>