urn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f8249 2017-07-14T19:47:54-06:00 SparkFun Electronics geekBoy urn:uuid:333fcb00-aed8-c5e5-e9ac-ca1664cd72a3 2015-03-05T11:45:44-07:00 <p>I just got an Arduino Leonardo R3 experimenter (20-013-134) set from Amazon.com that has an 8x8 led matrix and a four digit 7 segment display by SainSmart.com. They are both dumb and I need your backpacks to make them smart. I did not see a backpack for your Led matrix or the 7 segment display. Do you have backpack for these that I can buy? I upgraded all of my LCDs to ones with color backlights and I use your LCD serial backpack for all of them. I love your backpacks and breakout boards. These people also have 3D printer brain kits that I have never seen before. My kit also has an ultra sonic range finder, an MP3 player infrared remote control with receiver chip and a prototyping shield.</p> Customer #24135 urn:uuid:446b681a-ab58-59bb-fd3e-f2628a4adc85 2014-12-04T07:35:19-07:00 <p>Yes, 1K is a horrible value if you want to run the display at 3.3v (as I do). The LED&rsquo;s are barely get enough current to light up and disappear under office lamp standard illumination. Ohms law says that I want to use something closer to 47 Ohms not 1000 Ohms so I&rsquo;m questioning why 1K was selected. It&rsquo;s not even a good value for 5V.</p> RobV urn:uuid:c8a7812f-e523-f16e-32f9-0ec12640a347 2014-09-30T04:33:03-06:00 <p>The schematic uses 1k resistors on the pins, perhaps dropping that to 220ohm will increase the brightness? i&rsquo;m hesitant with using 0-ohms because i am scared to fry the display!</p> teachop urn:uuid:0d9c8f14-c839-63f0-b2ce-b1dd59b15aef 2014-04-12T18:59:45-06:00 <p>The red ones are fine, the green one is so dim it is useless. Too bad I didn&rsquo;t read the comments below first, I see this is a known problem.</p> Jimb0 urn:uuid:ded67c6f-7dee-a783-6ac2-888faa3ceb16 2014-02-03T12:23:59-07:00 <p>The dimensions of the PCB are here: <a href="https://github.com/sparkfun/Serial7SegmentDisplay/wiki/Hardware%20Specifications#wiki-physical-dimensions" rel="nofollow" >https://github.com/sparkfun/Serial7SegmentDisplay/wiki/Hardware%20Specifications#wiki-physical-dimensions</a>. That section also says a little bit about the depth of the display. Hope that helps!</p> Cryocrat urn:uuid:35e8deea-f9e7-5870-8ab0-307ac8789ca7 2014-02-01T10:07:56-07:00 <p>Any chance I can get the measurements for this?</p> stainlessm urn:uuid:4de8d948-318d-322b-3636-075f57147a3d 2013-03-07T10:29:02-07:00 <p>Perfect little display for my Digispark thermostat project. Only requires two wires for communication plus Vin and ground. It is not as bright as some others but readable.</p> Customer #395337 urn:uuid:bae3ccd9-e0e1-b8ca-0918-f897d7a36657 2013-02-25T14:54:14-07:00 <p>I am writing in c to control the display over SPI. Can someone please describe the bit order and SPI mode the display is expecting?</p> Customer #207774 urn:uuid:e3de52f9-ca35-e66a-0bc5-c7ffe525dfc6 2013-02-07T14:45:04-07:00 <p>Update to my last comment on the brightness, I discussed this issue with sparkfun, the problem is the resistors used are limiting the current and keeping the displays dim. They do not seem to believe this is a design flaw, but seeing(or not) how this is a display its only function is to be seen.</p> <p>They suggested soldering around the resistors, which with SMD can be quite a pain. I found another method using the conductive paint that sparkfun sells you can put a little dab on each resistor and when it dries you will see the display at least double in brightness.</p> Customer #207774 urn:uuid:1af9e7da-28b5-021e-8923-d612673f08e8 2012-11-11T14:01:46-07:00 <p>Not impressed, these are so dim that they can only be displayed in dark areas. i have used many of thier older ones (red not green, i ordered green by mistake), even after cranking the brightness up they are not bright at all!!!!</p>