Driving large LED display with Raspberry Pi

Having Raspberry Pi power it would be shame to drive few LEDs. How about 128×32 LED sign board? Jon purchased a stack of red LED display modules and put the min to large sign. He chained them by using shift register. This way he was free from limits in building and controlling. He didn’t use any fancy software tricks and stuck with two bits per pixel resolution what allowed him to reach 400fps. Bar graph spectrum looks really responsive. Led sign draws significant amount of power. But PC power supply unit seems to take care. In order to make better GPIO performance, code is written in C rather than python. We know that C GPIO library allows much faster GPIO triggering what is needed to send frame data serially. There are couple example codes available – one uses single bit per pixel and another uses two bits that gives a little dim feature. Continue reading