Another option is 15 WS2811 addressable LED drivers.
Two of these boards could drive up to 48 segments.
No resistors needed, except maybe for the DP.
Leo..
Oh thank you for pointing that out! I connect it to +5V right?
Yes, connect to 5volt, like on the Sparkfun diagram I linked to in post#15.
Leo..
I ordering the parts and components for the project on monday.
I will post on the progress.
Wish me luck guys and thank you again!
Hello everyone, I succesfully managed to assemble the clock!
I found two anomaly however while testing it.
First is that it only works with my benchtop PSU.
I set the voltage to 12V, current limit to 5 and when I connect it to it it turns on and the leds start working when I press the reset button on the ardu.
However, If I connect the PSU I ordered, which is 12V 5A it simply wont work.
The Arudu power led is on, resetting also works as the yellow led is flashing when I press the button. BUT the leds won't flash up at all.
I tested the PSU with DMM and also with other 12V appliences and it's working fine.
The second wierd thing is that the LEDs stop working If I touch the PCB/screws on it. It looks like some grounding problem or something. But the PCB is a trough-hole premade PCB with no inner connections, also the screws are not connected to the electronics whatsoever.
The code that we used to test it working:
content.instructables.com/FKJ/2XID/HJGE3Y98/FKJ2XIDHJGE3Y98.txt
Video of it working with the bench PSU:
Hello there!
I thought I post my working prototype here.
Working prototype
I'm very grateful for helping me get this together. I'm very interested in your input of how it works.
Do you think I could safely increase the brightness of the multiplexed displays by using smaller resistors?
Thank you!
Don't call it a multiplexed display, because it isn't. Multiplexed displays have less brightness.
You can also increase supply voltage (12-15volt?), instead of changing the resistors.
Measure volt drop across one resistor, and work out segment current (V/ohm).
Look at the datasheet. Segment current should stay below 30mA I think .
Leo..
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