![]() For example, if you want to display a numeral on the 2nd digit, put: digitalWrite(D1, HIGH) digitalWrite(D2, LOW) digitalWrite(D3, HIGH) digitalWrite(D4, HIGH) Then, if you want to display the number "0" (all of the LEDs lit except "G"), then put digitalWrite(pinA, HIGH) digitalWrite(pinB, HIGH) digitalWrite(pinC, HIGH) digitalWrite(pinD, HIGH) digitalWrite(pinE, HIGH) digitalWrite(pinF, HIGH) digitalWrite(pinG, LOW) See the image below of a "2" being displayed in the third digit. I will try to post a tutorial soon on how to do common cathode, but here's the general idea: Looking at the display if you number the pins like this: 1 2 3 4 5 6 7 8 9 10 11 12 Then you should connect like this: Pin 1 goes through a 220 ohm resistor to pin 10 on the arduino and is called D4 Pin 2 goes to pin 9 on the arduino and controls segment A Pin 3 goes to pin 8 on the arduino and controls segment F Pin 4 goes through a 220 ohm resistor to pin 11 on the arduino and is called D3 Pin 5 goes through a 220 ohm resistor to pin 11 on the arduino and is called D2 Pin 6 goes to pin 2 on the arduino and controls segment B Pin 7 goes to pin 6 on the arduino and controls segment E Pin 8 goes to pin 5 on the arduino and controls segment D Pin 9 is used for the decimal and I'm not using that Pin 10 goes to pin 4 on the arduino and controls segment C Pin 11 goes to pin 3 on the arduino and controls segment G Pin 12 goes through a 220 ohm resistor to pin 13 on the arduino and is called D1 With common cathode, your D1, D2, D3, D4 calls are reversed. I have two different Amazon starter kits and they are both common cathode. ![]() Whereas all the anode connections of the LED segments are connected together to logic 1 in a common anode. We use logic 1 through a current limiting resistor to forward bias the individual anode terminals a to g. Shown below is a common anode seven segment. In common cathode seven segment displays, all the cathode connections of LED segments are connected together to logic 0 or ground. The difference between the two displays is the common cathode has all the cathodes of the 7-segments connected directly together and the common anode has all the anodes of the 7-segments connected together. ![]() The one that Jimmacle used here is a common anode if the link to the spec sheet is correct. There are two types of LED 7-segment displays: common cathode (CC) and common anode (CA). ![]() The LED which is being desired to be radiated must always be connected to the ground, so that circuit could be completed. If you have a different type then Jimmacle, then this won't work for you. In this type of display, anodes of all LEDs present in the display are interconnected or shorted, as is clear from figure 4.35 (a). Keep in mind that there are two kinds of 7-segment displays, common anode and common cathode. ![]()
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