The 7 displays are mounted to a 48" piece of Poplar that is painted black. Here's a little update on my progress so far for anyone interested. It's not a terrible amount, just wondering if having them in parallel is causing my issue. The LEDs are brighter, but still seem to flicker the same amount. Even when I do bump up the supply voltage to 5v the flicker is there. It doesnt seem to be a current issue because there is still 500mA on the wire to spare. Is that normal? I get that their in a matrix and the driver is cycling them on/off many times a second, but should I be able to discern the slight flicker? It's not my python because the displays latch the last value after the script is terminated and they still flicker. On another note, the 1.2" displays are kind of flickery. If I want to keep the Pi and the Displays happy with a more nominal voltage, how do I go about squeezing that out of a typical 5v wall wart adapter when I pull this off the bench? Current usage for the entire kit is roughly 500mA. I connected the Pi to this source as well, and if I take a reading at the 5v pins it is also reading lower than 5v until I crank up the supply. If I crank up the input voltage to about 5.5 vDC then I can get them closer to the expected 5v and there is a noticeable improvement in brightness. All of my displays are connected in parallel and if I take a voltage reading, its about 4.6 vDC at each display. IMG_0126.jpg (197.96 KiB) Viewed 6164 timesīut now I have questions about power again. Here is a pic of a single clock next to the Pi for scale: I plan to keep the pi in the middle of the clock. The length of this clock will be nearly 7 feet when completed, so there will be some significant wire runs, which introduces resistance and interference. I am not sure how I get this info to the display. I can easily use the linux OS date commands to extract the data from the system clock. I am handy with Bash/Perl, not so much with Python. Might need a DST light to indicate if its in affect. Some of these time zones do enjoy Daylight Savings Time (DST) so I have to factor that in for 3 of the displays. Not as flexible, but reduces the complexity (I think). Since these clocks will all share the same minute info, I am hoping I can just tie those digits together across all 7 clocks. I will black-out the AM/PM lights as this will be used in 24-hour mode only. I am not using the clocks in their consumer configuration because it is a pain in the ass to set them all, and nearly impossible to keep them in sync. ![]() I have a Model 1 B+ Pi which I hope is more than enough for this project. I have not done anything with a Pi before and my previous mbed project didnt exactly turn out as hoped. I'm no electrical engineer, but I have had military and college electronics courses. This is my first real electronics project in some time. If I cant use their SMD mounted LED's directly I will put in my own 5mm white LED's, but that's not my main issue. I will probably have to re-wire the display in them, I'm already prepared for that. I can get these clocks for about $15 each all day long. I am using some cheap clocks off of ebay (8.5" x 3") as purchasing large (>2") 7 segment LED's are quite expensive. What I am attempting to do is create a very large, multi-timezone clock using very large "7 segment" displays. The World Clock-Time Zones app is fully aware of the effects of these changes in all countries and territories and will adjust times based on the reliable and up-to-date databases from am looking for some guidance on my first Raspberry Pi project. We maintain more than a decade of experience in being an accurate and reliable provider of time and date related information worldwide.Ĭountries are constantly changing time zones and daylight saving time (DST) schedules. is an established company that first came online in 1998. An In-App Purchase is available to remove the ads.
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