13.Arduino learning notebook--four-bit digital tube experiment
13.Arduino learning notebook--four-bit digital tube experiment Juvtmall ( a company supply PCB Prototyping , PCBA service and sell kinds of components, modules and so on) ( Catduino has the same function of Arduino) This experiment uses the arduino to drive a four-bit digital tube. It is necessary to drive the current-limiting resist a nce of the digital tube. There are two ways of current-limiting resist a nce, one is connecting to the d1-d4 anode . The benefit of this method is that the resistance demanded is less, produce s that different n umbers will produce different brightness in each number . 1 is brightest and 8 is the darkest.The other method is connecting to the other eight pins, which show s uniform brightness , but needs more resistance.This experiment us es eight 220 Ω res...