Summary of 7 Segment LED Based SPI Display using 74HC595
This project creates a large 3.5-inch single-digit 7-segment display using five 5mm LEDs per segment and a 74HC595 shift register for microcontroller control. A ULN2003 IC manages current sinking, while resistors limit LED current. The design supports serial stacking via data connectors for multi-digit displays.
Parts used in the Single Digit Big Display module:
- 74HC595 IC
- ULN2003 IC
- 5mm high glow type LEDs (5 per segment)
- Current limiting Resistors R1 to R8
- CN1 Data In connector
- CN2 optional Data Out connector
- VCC power supply (5V DC)
Single Digit Big Display module using 74HC595 IC project will display large size 7 segment single digit number. 3.5inch height, which can be visible over large distance. More digit can be connected serially to each other easily connector.
This circuit is a single digit seven segment big display using a set of 5 LEDs per segment and a shift register for easy control by micro-controller input. Each of the LEDs used in this project are 5mm high glow type.
Specifications
- A ULN2003 IC helps sink higher current flowing through the LEDs to ground.
- Resistor R1 to R8 are current limiting Resistors for the LEDs connected in series.
- CN1 Connector is Data In connector
- CN2 Connector is optional Data Out Connector if you need to stack more than 1 single display board in series
- +V CN1 & CN2 should be connected to higher voltage to drive the LEDs
- VCC Should be connected to 5V DC. This supply can be source from host controller
- Each Segment made up of 5LEDs
For more detail: 7 Segment LED Based SPI Display using 74HC595
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How does the circuit control the display?
A 74HC595 shift register allows easy control by micro-controller input. -
What is the height of the displayed digit?
The display shows a 3.5-inch height digit visible over large distances. -
Can multiple displays be connected together?
Yes, more digits can be connected serially using the optional CN2 connector. -
What component handles higher current flow?
A ULN2003 IC helps sink higher current flowing through the LEDs to ground. -
How many LEDs are used per segment?
Each segment is made up of 5 LEDs. -
What voltage should VCC be connected to?
VCC should be connected to 5V DC, which can be sourced from the host controller.
