Shift-Register 4094 Seven Segment Arduino Library

Use 3 pins of Arduino to control multiple 7-segment display with 4094 8-bit shift register. It has been tested on HEF4094B CD4094B CD4094BM and MC74HCT4094A.

Features

• Display upto 255 seven-segment digits
• Display number (Negative, Float)
• Display alphabets (char array)
• Common anode and cathode displays
• Clear the display

Install Libraray

1. Download the library as ZIP file
2. Arduino IDE > Sketch > Include Library > Add .ZIP Library > Select "Arduino-shiftRegister4094SevenSeg.ZIP"
3. Arduino IDE > File > Examples > Arduino-shiftRegister4094SevenSeg > SimpleDisplay

Circuit

• Data pin: D pin on shift register.
• Clock pin: CLK or CP pin on shift register.
• Strobe pin: STR on pin shift register.

Reference

Constructor

• shiftRegister4094SevenSeg()

  shiftRegister4094SevenSeg newObject(bool type, uint8_t digit_num);

  Create shiftRegister4094SevenSeg object (can be more than one), segment type and number of 7-segment digit.

  • type : segment type, can be CATHODE (true) or ANODE (false).
  • digit_num : number of digit, can be between 0 to 255.

  Example:

  shiftRegister4094SevenSeg myDisplay(CATHODE, 4); // Common Cathode with 4 digit display

Initializes

• begin()

  begin(uint8_t data_pin, uint8_t clock_pin, uint8_t strobe_pin);

  Initializes the library with communication pins which are connected to Arduino in setup().

  Example:

  void setup(){
    myDisplay.begin(2, 3, 4);
  }

Functions

• print()

  Using print() function to print the data to the digits. Print funstion always starts from the left digit and turn all off when the data is too long to fit the digits.

  • Print one character (A-Z)

  myDisplay.print(char cha); 

  • Print integer value (positive or negative)

  myDisplay.print(int value);

  • Print long value (positive or negative)

  myDisplay.print(long value); 

  • Print float value (Default). Ex 2.34

  myDisplay.print(float value); 

  • Print float with specific number of decimals. Ex. 234.7

  myDisplay.print(float value, int dec); 

  • Print string array. Ex. "A45U"

  myDisplay.print(char str[]);

• clear()

  Using clear() function to turn off all digit (everything).

  myDisplay.clear();

• allOn()

  Using allOn() function to turn on all digit include the dot.

  myDisplay.allOn();

TODO

• Alignment, left or right.
• Print at specific digit.
• Clear specific digit, could be multiple digit. Ex. clear(from, to).
• Blink specific digit, could be multiple digit. Ex. blink(from, to).
• Testing to see issues.

Contacts

Email: theara729@gmail.com

Web: www.etronicskh.com.