Led Sign Board Build Project:

[stj]

Re: Led Sign Board Build Project:

go look at the led stuff here:
http://www.banggood.com/

like these:
http://www.banggood.com/CJMCU-64-Bit...-p-981678.html

http://www.banggood.com/100Pcs-DC-5V...-p-979463.html

http://www.banggood.com/CJMCU-40-Bit...-p-997521.html

[diif]

Re: Led Sign Board Build Project:

go look at the led stuff here:
http://www.banggood.com/

....and all their other cool stuff

Cheers stj

[Spork Schivago]

Re: Led Sign Board Build Project:

i read that one supplier gives a discount to EEVBLOG members.
and i know another gives a free UNI-T meter wih every order over £200
(NO, not the UT-61E )

They do. The only supplier I know that does this is TEquipment.NET. It's either a 6% discount or a 9%, can't remember. I got the code in my private messages back on EEVBLOG if you want me to double check the discount.

http://www.tequipment.net/

They'll also price match certain things and give larger discounts if you buy a bunch of stuff at once, like a scope, a psu, multimeter, reflow station, etc.

[stj]

Re: Led Sign Board Build Project:

i tried to sign up at EEV but they never authorised the account - bastards.

[wiregrassbulldog]

Re: Led Sign Board Build Project:

Interesting.

How about using a raspberry pi zero ($5.00)?

https://github.com/Boomerific/rpi-rgb-led-matrix

http://raspberrypi.stackexchange.com...y-raspberry-pi

[stj]

Re: Led Sign Board Build Project:

zero is workable for a serial-drive design but not for a strobed matrix.
you need to be able to directly control the hardware using machinecode for diect matrix-drive.

an o.s. in the way will cause too much latency.

a NUCLEO board - such as NUCLEO-F446RE would be unstoppable though!!!

[ben7]

Re: Led Sign Board Build Project:

zero is workable for a serial-drive design but not for a strobed matrix.
you need to be able to directly control the hardware using machinecode for diect matrix-drive.

an o.s. in the way will cause too much latency.

a NUCLEO board - such as NUCLEO-F446RE would be unstoppable though!!!

Agreed .. actually just about any MCU would work. That is, depending on your requirements (I/Os, speed, I/O bandwidth, etc..).

P.S. I'm making a digital clock with RGB LED strips as the segments, and in order to save on I/Os, it scans the display. It does so fast enough to make the whole thing look lit up (persistence of vision). The downfall is though, I bet it'll make some EMI ... it's at least 2.5 feet wide, not 2.5 inches :P (thus it acts like a big antenna)
Also, due to the circuit design, different digits can be different colors, but not different color segments (in the digits themselves). Then it would have to scan more segments, and use an even higher current through the LEDs to get a good brightness level...

-Ben