LED digital tubeThe commonly used number of segments is usually 7. Some have an additional decimal point, while others are similar to a 3-digit "1" type. There are half digits, 1, 2, 3, 4, 5, 6, 8, 10 digits, and so on, LED digital tubes are divided into two categories based on the different connections of LEDs: common cathode and common anode. Understanding these characteristics of LEDs is important for programming because different types of digital tubes have different hardware circuits and programming methods. Figure 2 shows the internal circuit of the common cathode and common anode digital tubes. Their light emission principles are the same, only their power polarity is different. There are several colors available, including red, green, blue, yellow, etc.

LED digital tubes are widely used in instruments, clocks, stations, household appliances, and other occasions. When selecting, attention should be paid to product size, color, power consumption, brightness, wavelength, etc.

The following will introduce commonly used onesLED digital tubeInternal pin image.

This is a 7-segment 10 pin with two decimal placesLED digital tubeFigure 2 defines that each stroke corresponds to a letter indicating that DP is a decimal point. Control each through time-sharing rotationLED digital tubeThe COM end enables each digital tube to be controlled and displayed alternately, which is called dynamic driving. The lighting time of each digital tube is 1-2ms. Due to the phenomenon of human visual persistence and the afterglow effect of light-emitting diodes, although the digital tubes are not lit at the same time, as long as the scanning speed is fast enough, it gives the impression of a stable display data without flickering. The dynamic display effect is the same as the static display, which can save a lot of I/O ports and lower power consumption.