CD4543B can be used to control common anode seven segment display too. Controlling common anode seven segment display using CD4543B is pretty simple. VCC pin of the seven segment display should be connected to the positive
Truth table of CD4543B for Common Anode Seven Segment Display.
To control a common cathode seven segment display using CD4543B
PH ( Pin 6 ) should be set HIGH.
LD ( Pin 1 ) should be set HIGH.
BL ( Pin 7 ) should be set LOW.
If all the above conditions are satisfied, then the output will change when the input changes.
If LD goes LOW from HIGH, then the output will be same as the previous output when LD pin was HIGH. Changes in INPUT will not affect the OUTPUT.
If BL goes HIGH, then the seven segment display will turn off and is independant of any other pins.
Now upload the following program to your arduino board. Reset the arduino board if needed.
int Ph = 6; //arduino pin connected to the Ph pin of 4543
int BL = 5; //arduino pin connected to the BL pin of 4543
int LD = 11; //arduino pin connected to the LD pin of 4543
int A = 7;
int B = 9;
int C = 10;
int D = 8;
void setup()
{
// Declare all the pins as OUTPUT pins
pinMode(Ph, OUTPUT);
pinMode(BL, OUTPUT);
pinMode(LD, OUTPUT);
pinMode(A , OUTPUT);
pinMode(B , OUTPUT);
pinMode(C , OUTPUT);
pinMode(D, OUTPUT);
}
void loop()
{
// Display 0
digitalWrite(Ph, HIGH);
digitalWrite(BL, LOW);
digitalWrite(LD, HIGH);
digitalWrite(A , LOW);
digitalWrite(B , LOW);
digitalWrite(C , LOW);
digitalWrite(D , LOW);
delay(1000);
// Display 1
digitalWrite(A , HIGH);
digitalWrite(B , LOW);
digitalWrite(C , LOW);
digitalWrite(D , LOW);
delay(1000);
// Display 2
digitalWrite(A , LOW);
digitalWrite(B , HIGH);
digitalWrite(C , LOW);
digitalWrite(D , LOW);
delay(1000);
// Display 3
digitalWrite(A , HIGH);
digitalWrite(B , HIGH);
digitalWrite(C , LOW);
digitalWrite(D , LOW);
delay(1000);
// Display 4
digitalWrite(A , LOW);
digitalWrite(B , LOW);
digitalWrite(C , HIGH);
digitalWrite(D , LOW);
delay(1000);
}
Output of the above program is given below.
To get an idea about the working of LD pin, upload the following program.
int Ph = 6; //arduino pin connected to the Ph pin of 4543
int BL = 5; //arduino pin connected to the BL pin of 4543
int LD = 11; //arduino pin connected to the LD pin of 4543
int A = 7;
int B = 9;
int C = 10;
int D = 8;
void setup()
{
// Declare all the pins as OUTPUT pins
pinMode(Ph, OUTPUT);
pinMode(BL, OUTPUT);
pinMode(LD, OUTPUT);
pinMode(A , OUTPUT);
pinMode(B , OUTPUT);
pinMode(C , OUTPUT);
pinMode(D, OUTPUT);
}
void loop()
{
// Display 0
digitalWrite(Ph, HIGH);
digitalWrite(BL, LOW);
digitalWrite(LD, HIGH);
digitalWrite(A , LOW);
digitalWrite(B , LOW);
digitalWrite(C , LOW);
digitalWrite(D , LOW);
delay(1000);
// Display 1
digitalWrite(Ph, HIGH);
digitalWrite(BL, LOW);
digitalWrite(LD, HIGH);
digitalWrite(A , HIGH);
digitalWrite(B , LOW);
digitalWrite(C , LOW);
digitalWrite(D , LOW);
delay(1000);
// Display 2
digitalWrite(Ph, HIGH);
digitalWrite(BL, LOW);
digitalWrite(LD, HIGH);
digitalWrite(A , LOW);
digitalWrite(B , HIGH);
digitalWrite(C , LOW);
digitalWrite(D , LOW);
delay(1000);
// Display 2 itself
digitalWrite(Ph, HIGH);
digitalWrite(BL, LOW);
digitalWrite(LD, LOW);
digitalWrite(A , HIGH);
digitalWrite(B , HIGH);
digitalWrite(C , LOW);
digitalWrite(D , LOW);
delay(1000);
// Display 4
digitalWrite(Ph, HIGH);
digitalWrite(BL, LOW);
digitalWrite(LD, HIGH);
digitalWrite(A , LOW);
digitalWrite(B , LOW);
digitalWrite(C , HIGH);
digitalWrite(D , LOW);
delay(1000);
}
int Ph = 6; //arduino pin connected to the Ph pin of 4543
int BL = 5; //arduino pin connected to the BL pin of 4543
int LD = 11; //arduino pin connected to the LD pin of 4543
int A = 7;
int B = 9;
int C = 10;
int D = 8;
void setup()
{
// Declare all the pins as OUTPUT pins
pinMode(Ph, OUTPUT);
pinMode(BL, OUTPUT);
pinMode(LD, OUTPUT);
pinMode(A , OUTPUT);
pinMode(B , OUTPUT);
pinMode(C , OUTPUT);
pinMode(D, OUTPUT);
}
void loop()
{
// Display 0
digitalWrite(Ph, HIGH);
digitalWrite(BL, LOW);
digitalWrite(LD, HIGH);
digitalWrite(A , LOW);
digitalWrite(B , LOW);
digitalWrite(C , LOW);
digitalWrite(D , LOW);
delay(1000);
// Display 1
digitalWrite(Ph, HIGH);
digitalWrite(BL, LOW);
digitalWrite(LD, HIGH);
digitalWrite(A , HIGH);
digitalWrite(B , LOW);
digitalWrite(C , LOW);
digitalWrite(D , LOW);
delay(1000);
// Display 2
digitalWrite(Ph, HIGH);
digitalWrite(BL, LOW);
digitalWrite(LD, HIGH);
digitalWrite(A , LOW);
digitalWrite(B , HIGH);
digitalWrite(C , LOW);
digitalWrite(D , LOW);
delay(1000);
// Display 2 itself
digitalWrite(Ph, HIGH);
digitalWrite(BL, LOW);
digitalWrite(LD, LOW);
digitalWrite(A , HIGH);
digitalWrite(B , HIGH);
digitalWrite(C , LOW);
digitalWrite(D , LOW);
delay(1000);
// Display 4
digitalWrite(Ph, HIGH);
digitalWrite(BL, LOW);
digitalWrite(LD, HIGH);
digitalWrite(A , LOW);
digitalWrite(B , LOW);
digitalWrite(C , HIGH);
digitalWrite(D , LOW);
delay(1000);
}
Output of the above program will be:
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