Arduino; using the 4 digit 7 segment display. The next obvious point is that this method uses way too many arduino pins to use in any standalone project, which might also include a number of other sensors or motors so that you run out of arduino pins to use.
7-Segment Display—Standard 7-segment display with no decimal point (DP).; 7-Segment Display with Decimal—7-segment display with a DP that maps to terminal G. This one is useful when you want to display numbers greater than ten or decimal numbers by connecting two or more 7-segment displays. The Serial 7-Segment Display is an easy-to-use 4-digit display that is controlled using a serial interface. Instead of using up a dozen-or-so of your microcontroller's pins to control the LEDs, all you need is one. Using either a serial, I 2 C, or SPI interface, you can control all digits, decimal ...
Seven-Segment LED Displays Nicholas Neumann 11/19/2010 Abstract Seven-segment displays are electronic display devices used as an easy way to display decimal numerals and an alterative to the more complex dot-matrix displays. The LDS-C303RI, a common seven-segment display, will be examined. Common anode vs. common cathode will be outlined. 7-Segment LED Display. 7-segment displays are made up of 8 LED segments. 7 of these LED segments are in the shape of a line, whereas 1 segment is circular. The 7 line shaped LED segments are used for displaying numbers 0 to 9 and a few letters like A, c, d, e, F, H, L, O, P, U, etc. The circular segment is used for displaying decimal point. All of the display configurations given in Table 4 can be implemented in a typical system as shown in Figure 4. Table 4. Selection of possi  7-segment display has eight elements including the decimal point.  14-segment display has 16 elements including decimal point and accent dot. Fig 3. Example of displays suitable for PCF85134 e-radionica.com How to Display any Character on a 7 Segment LED Display. In this project, we will show how you can display any character that is capable of being displayed on a 7 segment LED display. All numeral characters can be displayed on a 7 segment display.
A Digital Decoder IC, is a device which converts one digital format into another and one of the most commonly used devices for doing this is called the Binary Coded Decimal (BCD) to 7-Segment Display Decoder. The HEF4543B is a BCD to 7-segment latch/decoder/driver for liquid crystal and LED displays. It has four address inputs (D0 to D3), an active LOW latch enable input (LE ), an active HIGH blanking input (BL), an active HIGH phase input (PH) and seven buffered segment outputs (Qa to Qg).