3/11/2024 0 Comments Jam digital 7 segment arduino![]() The 4 transistors are of the same type (PNP). Base terminals of the four transistors are connected to Arduino through 4.7k resistors. Emitter terminals of the 4 transistors are connected to +5V which comes from the Arduino board. Each common pin is connected to collector terminal of one transistor. Since the display has 4 digits there’re 4 common pins: 1 (most left), 2, 3 and 4. ST_CP (or RCLK) and SH_CP (or SRCLK) are connected together which then connected to Arduino pin 7. The data pin of the 74HC595 shift register is named DS (#14) and it is connected to Arduino pin 6. Segment A … G are connected to 74HC595 pin Q7 … Q1 respectively and segment DP is connected to pin Q0. ![]() ![]() The image below shows our example circuit schematic diagram.Īs shown in the circuit diagram above, all segment pins are connected to the 74HC595 output pins, each one through 100 ohm resistor, where: 4 x PNP transistor ( 2SA1015, 2S9015, 2N3906 …)Īrduino 7-Segment display with 74HC595 shift register circuit:.
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