![]() Figure 4: CA display, segment pins b and c set to LOW. Figure 3: Seven segment common anode display. In a Common Anode (CA) seven segment display (figure 3) the anodes (positive terminals) of all of the segments are connected together. Figure 2: CC display, segment pins b and c set to HIGH. UPDATE: If (as OP states) youre prepared to wire-link the common node to Vdd or Gnd then you just need to make the RGB drive signals selectable positive/negative logic (i.e. NOTE: I took this picture myself from my camera, Please Do not mind for image clarity ,so i have put some labellings also. Figure 1: Seven segment common cathode display. The larger end inside the led is -ve and the shorter one is +ve, that is how we find out the polarity of a LED As they have to be crystall clear to glow so they don’t have any labeling on it, so the only way to know is either to test it with a multimeter or by carefully observing inside the led. Notice the picture carefully and compare it with the LED diode symbol, that should tell which one is –ve and +ve terminal. I hope the figure below can solve this problem of identification. These devices combine the low quiescent power dissipation and high noise immunity features of RCA CMOS with n-p-n bipolar output transistors capable of sourcing up to 25 MA. To illuminate any LED of the display, you need to supply logic ‘1’ to its corresponding input pin. Take the common anode terminaland connect it with the GND pin in the Arduino. It should be connected to GND or logic ‘0’ during its operation. Using Common Cathode (CC) RGB LED with Arduino Setting up the circuit: Hooking up the components is easy. LED's or Light Emitting Diode's don’t come with any labeling on it to identify Cathode(-ve,GND) or Anode(+ve). CD4511B types are BCD-to-7-segment latch decoder drivers constructed with CMOS logic and n-p-n bipolar transistor output devices on a single monolithic structure. In such type of 7-segment display, all the cathodes of the 7 LEDs are connected together to form a common terminal. Sometime the diode symbol creates confusion too.Identifing a LED's the cathode and anode of a led is very easy by looking inside. So for identification, led’s comes with a unique way to identify its terminals as Anode or Cathode. ![]() While referring to any schematic involving led's we sometimes get confused with the identification of the terminals.
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