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Connection between 1st 74595 IC and cluster of common cathode seven segment displays can be summarized as :
Q0 pin (pin 15) of 1st 74595 is connected to the common "a" terminal of seven segment display cluster.
Q1 pin (pin 1) of 1st 74595 is connected to the common "b" terminal of seven segment display cluster.
Q2 pin (pin 2) of 1st 74595 is connected to the common "c" terminal of seven segment display cluster.
Q3 pin (pin 3) of 1st 74595 is connected to the common "d" terminal of seven segment display cluster.
Q4 pin (pin 4) of 1st 74595 is connected to the common "e" terminal of seven segment display cluster.
Q5 pin (pin 5) of 1st 74595 is connected to the common "f" terminal of seven segment display cluster.
Q6 pin (pin 6) of 1st 74595 is connected to the common "g" terminal of seven segment display cluster.
Q7 pin (pin 7) of 1st 74595 is connected to the common "dp" terminal of seven segment display cluster.
Connection between 2nd 74595 IC and cluster of common cathode seven segment displays can be summarized as :
Q0 pin (pin 15) of 2nd 74595 is connected to the cathode terminal 1 of seven segment display cluster.
Q1 pin (pin 1) of 2nd 74595 is connected to the cathode terminal 2 of seven segment display cluster.
Q2 pin (pin 2) of 2nd 74595 is connected to the cathode terminal 3 of seven segment display cluster.
Q3 pin (pin 3) of 2nd 74595 is connected to the cathode terminal 4 of seven segment display cluster.
Q4 pin (pin 4) of 2nd 74595 is connected to the cathode terminal 5 of seven segment display cluster.
Q5 pin (pin 5) of 2nd 74595 is connected to the cathode terminal 6 of seven segment display cluster.
Q6 pin (pin 6) of 2nd 74595 is connected to the cathode terminal 7 of seven segment display cluster.
Q7 pin (pin 7) of 2nd 74595 is connected to the cathode terminal 8 of seven segment display cluster.
Circuit can be redrawn, by replacing the cluster of eight common cathode seven segment displays by an 8*8 LED matrix, as shown below. If the circuit is not clear, download it to your computer (Right click on the circuit => Save image as) and open in a suitable image viewer.
.jpg)
We have found the procedures for converting a cluster of eight common cathode seven segment displays to an 8*8 LED matrix in previous blog. If the cluster of seven segment display is redrawn as an 8*8 LED matrix, column terminals of LED matrix forms the anode terminals (a, b, c, d, e, f, g and dp) of seven segment display cluster. Similarly, row terminals of LED matrix forms the cathode terminals (1, 2, 3, 4, 5, 6, 7 and 8) of seven segment display cluster.
Each rectangular box of matrix represents one common cathode seven segment display. From the circuit, it is clear that, each rectangular box has eight anode terminals (a, b, c, d, e, f, g and dp) and one cathode terminal.
.jpg)
"a" terminal of all the seven segment displays are interconnected to form a common "a" terminal. Similarly, "b" terminal of all the seven segment displays are interconnected to form a common "b" terminal. Same connections are repeating for c, d, e, f, g and dp terminals. One cathode terminal is common to all the anode terminals of corresponding seven segment display. This will look like an 8*8 LED matrix and controlling can be done in the same way in which 8*8 LED matrix is controlled.
Q0 pin (pin 15) of 1st 74595 is connected to the common "a" terminal of seven segment display cluster.
Q1 pin (pin 1) of 1st 74595 is connected to the common "b" terminal of seven segment display cluster.
Q2 pin (pin 2) of 1st 74595 is connected to the common "c" terminal of seven segment display cluster.
Q3 pin (pin 3) of 1st 74595 is connected to the common "d" terminal of seven segment display cluster.
Q4 pin (pin 4) of 1st 74595 is connected to the common "e" terminal of seven segment display cluster.
Q5 pin (pin 5) of 1st 74595 is connected to the common "f" terminal of seven segment display cluster.
Q6 pin (pin 6) of 1st 74595 is connected to the common "g" terminal of seven segment display cluster.
Q7 pin (pin 7) of 1st 74595 is connected to the common "dp" terminal of seven segment display cluster.
Connection between 2nd 74595 IC and cluster of common cathode seven segment displays can be summarized as :
Q0 pin (pin 15) of 2nd 74595 is connected to the cathode terminal 1 of seven segment display cluster.
Q1 pin (pin 1) of 2nd 74595 is connected to the cathode terminal 2 of seven segment display cluster.
Q2 pin (pin 2) of 2nd 74595 is connected to the cathode terminal 3 of seven segment display cluster.
Q3 pin (pin 3) of 2nd 74595 is connected to the cathode terminal 4 of seven segment display cluster.
Q4 pin (pin 4) of 2nd 74595 is connected to the cathode terminal 5 of seven segment display cluster.
Q5 pin (pin 5) of 2nd 74595 is connected to the cathode terminal 6 of seven segment display cluster.
Q6 pin (pin 6) of 2nd 74595 is connected to the cathode terminal 7 of seven segment display cluster.
Q7 pin (pin 7) of 2nd 74595 is connected to the cathode terminal 8 of seven segment display cluster.
Circuit can be redrawn, by replacing the cluster of eight common cathode seven segment displays by an 8*8 LED matrix, as shown below. If the circuit is not clear, download it to your computer (Right click on the circuit => Save image as) and open in a suitable image viewer.
Each rectangular box of matrix represents one common cathode seven segment display. From the circuit, it is clear that, each rectangular box has eight anode terminals (a, b, c, d, e, f, g and dp) and one cathode terminal.
"a" terminal of all the seven segment displays are interconnected to form a common "a" terminal. Similarly, "b" terminal of all the seven segment displays are interconnected to form a common "b" terminal. Same connections are repeating for c, d, e, f, g and dp terminals. One cathode terminal is common to all the anode terminals of corresponding seven segment display. This will look like an 8*8 LED matrix and controlling can be done in the same way in which 8*8 LED matrix is controlled.
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