The marked corners do no look aligned, though they are perfectly in line. This is something that always annoyed me with this font. Optical correction of the corner-segments I did this to have it scale down nicely to 50mm (segment-width is 5mm in that case) and bigger is easily scaled too.

You can see that everything is now nicely symmetrical, aligned and has even dimensions in mm for all important features (segment width, supports between segments, character height). Dimensions are as in the following drawing. The layout of the segments has been revised. New design (includes special WS2813 footprint) Jan.The FastLed library has options to restrict power consumption, we'll look into that later on. But in normal operation it'll draw something around 1A or less. I expect it to use a maximum of 1.8 - 2A at a 'good to read in daylight brightness'. The clock won't run this brightly for any longer period of time, so the above values are very conservative. Expecting all segments active would draw 5.4A from the supply which is totally unrealistic. So, for this clock I will use a 5V, 25W standard power supply. So there needs to be a low-power mode for programming which is preferably activated automatically. We also need to take into consideration that when programming the clock, it might only connected be to the PCs USB port (which might even be USB 1.0, who knows). With 2 LED's the current would be 2.76A, with only one LED 1.44A.Ĥ.08A is too much for the standard USB 1.0 / 2.0 output (500mA max) and even for all those USB-phone chargers which deliver up to 2.1A. At an estimated 85% efficiency of a wall plug this is 23.5W of total mains power usage.Īnother way to ship around this is to use only 1 or 2 LED's per segment. In my case this will be the time displayed with most segments on at maximum brightness in white color (*3 because of 3 LEDs per segment): This is the most important factor for choosing a power supply! You should always consider the worst case scenario of your application. has them too (wouldn't be surprised if there are fakes out there). If you're interested in a smaller case, the WS2812C-2020 or the WS2813B-MINI are your choice, which come in a 2020 respectively 3535 case. It has only 5mA per color at much less brightness. They offer some dimmer variants as well, the WS2812C for example. The famous WS2812 found on LED strips is most likely the WS2812B type, which has a current consumption of 20mA max per color (60mA at full brightness white). Worldsemi (that's what WS stands for) has those LED's in many different styles. We will discuss these in the following paragraphs LED types

how many LED's will be on at a time at which color and brightness level.type of LED (there's different versions of those LED's available).There's some important things to keep in mind when designing with Worldsemis WS281X LED's.

7 segment display font