IoT For Makers

So far I've covered a lot of blogs that mainly use Raspberry Pi + RGB Matrix HAT. The reason is that the display content can be handled freely. In particular, using the OpenCV and PIL modules in Python, various contents can be produced. The RGB LED Matrix is ​​so popular and widely used that there are many commercial products also. Users who unfamiliar with programming can also create their own content using specialized products for the RGB LED matrix, such as the HD-D15. My other blog has covered how to use this product. But I still love the combination using Raspberry Pi + RGB Matrix HAT. In previous posts, we have seen how to use up to 3 LED chains in one HAT. Normally, up to 12 LED Matrix can be connected in one daisy chain, but this value depends on the size of the LED Matrix, the performance of the Raspberry Pi, and the CPU resources required for real-time content creation. Assuming that up to 12 32 X 64 LED matrixes are connected per chain, it is theoretically possible to c...

So far I've only used one chain to handle the RGB LED matrix on the Raspberry Pi. Adafruit's HAT and Bonnet only support one chain. <Adafruit HAT/Bonnet that supports one HUB75 interface> However, the PCB designed by Henner Zeller supports up to three chains. This is the maximum number of chains that the Raspberry Pi's 40 GPIO can support. <Henner Zeller's HAT and Electrodragon HAT those support 3 chains> Why use multi chains Use daisy connections to connect multiple LED matrices in a chain. I've explained daisy connectin in my other blog . Daisy connections are not infinitely possible. Since the signal must be delivered to adjacent LEDs, connecting more than a certain number will slow down the signal transmission and cause screen flicker. Henner Zeller recommends no more than 12 connections in a chain. However, this value depends on which LED matrix, Raspberry Pi you use. For example, using a 64X64 LED matrix will reduce the nu...