WHITE COMMON CATHODE LED MATRIX DRIVER

Much shown, but I hope it helps to imagine / understand my original problem / question.

WHITE COMMON CATHODE LED MATRIX DRIVER

The Matrix 'module' will only contain the transistors and the 3 to 8 decoder with an enable bit ( latch ? ) and all the other parts will be on the driver board, shared by all the other matrix modules. You can also use old LegoTechnik Bars for the Grid so you get the 8x8 dot LED matrix straight and clean if you decide to make it yourself.

Here's a second image that shows my idea in a better way.īetween the LEDs ( ! ) and that 'mode switching circuit' there will be transistors that are switched via decoders and shift registers. Pack of 10 5mm RGB LEDs (Common Cathode).Forward VoltageR: 1.9 - 2.2G: 2.8 - 3.2B: 2.8 - 3.2Wavelength (nm)R: 620 625G: 515 520B: 460 465 Pinout and. There are pre-made LED matrixes, or if you want feel free to make own matrix from 64 LEDs, using the schematic as shown above for common cathode or common anode matrixes. I am a Software engineer / developer, so bare with me if this is totally wrong and please tell me the correct / better way of achieving this functionality. If I bridge the bottom and the middle pin I can use LEDs with common cathode. If I bridge the top and the middle pin, I can use common anode RGB LEDs. ( I could also use an on-on-switch instead )

I've sketched this circuit that is using two opto-isolators and a pin strip ( 3 pin ) with a jumper as a switch. One for using common anode LEDs and one for common cathode LEDs. I was wondering if there is a way to switch between two 'modes'. The best I can find is the MAX6956 that can drive up to 28 LEDs.

Alternatively lookup the right driver for CA. Since Nch FETs are better with sink RdsOn, this why the topology for CC. but as I wanted to purchase all the LEDs ( in packs of 1000 ), I realized that my designs all require either common anode or common cathode RGB LEDs. It is designed for common cathode (CC) LEDs not CA. So I came up with a couple of designs that I've tested and so on. I'm designing a driver / controller board for 8x8 RGB LED Matrices that then can be daisy chained to e.g.

White common cathode led matrix