EmSevenSegment

This is a library to control 7-segment display using 4094 8-bit shift register. It has been tested on HEF4094B, CD4094B, CD4094BMS, & MC74HCT4094A

Features

Concatenate upto 255 displays using just 3 pins of Arduino
Prints both numbers and alphabets
Supports both common anode and common cathode displays
Directly print multiple integer values
Print arrays of numbers/strings
Add/remove leading zeros for numbers
Choose between left/right alignment of text
Blink at specific location on display
Clear the display

Install

Download the library from github
Extract and copy the folder into Documents > Arduino > Libraries
Test using an example code from File > Examples > EmSevenSegment > test

Hardware required

The following are a must:

Any arduino board
Shift register 4094
7-segment led display.

Basic circuit

Hardware requirements may change due to larger current requirement of bigger sized displays.

Reference

Constructor

EmSevenSegment()
- EmSevenSegment disp(char type,uint8_t dataPin,uint8_t clockPin,uint8_t strobePin)
- EmSevenSegment disp(int digits,char type,uint8_t dataPin,uint8_t clockPin,uint8_t strobePin)
Creates EmSevenSegment object, initializes the library with the interface pins, and sets up with the display properties.

disp: is a variable of type EmSevenSegment.

type: C for common cathode; A for common anode;

digits: is the number of single 7-segment displays connected in series. default value is 1.

dataPin, clockPin, strobePin: are the number of the Arduino digital pins connected to the shift registers data, clock and strobe pins.

Functions

print()
- disp.print(value)
- disp.print(value, digits)
- disp.print(lengthOfArray,array,digitsForElement)
To print a value on the 7-segment display

disp: is a variable of type EmSevenSegment.

value: is the value to save and show; can be a number (int, long) or text (char, String object); for text, valid characters are 0-9 a-z A-Z - space.

digits: is the number of digits alloted to print the value; default value is the total number displays connected.

lengthOfArray: number of elements in array to be printed.

array: array of elements to be printed.

digitsForElement: number of digits alloted for each element.
clear()
- disp.clear()
- disp.clear(digits)
To clear the display.

disp: is a variable of type EmSevenSegment.

digits: is the number of digits to be cleared; default value is the total number of displays connected.
blink()
- disp.blink(lengthOfArray,array,digitsForElement,blinkingElement,blinkTime)
To blink at a particular location in the display.

disp: is a variable of type EmSevenSegment.

lengthOfArray: number of elements in array to be printed.

array: array of elements to be printed.

digitsForElement: number of digits alloted for each element.

blinkingElement: index of element to be blinked.

blinkTime: blinking time of the element.
set()
- disp.set(param,value)
To set the parameters of the display.

disp: is a variable of type EmSevenSegment.

param: "ALIGN" to set alignment; "ZEROS" to show/hide leading zeros; "OUT" to enable/disable latch operation.

value: for alignment: L for left align; R for right align; default set to right; for leading zeros: Y to show leading zeros; N to hide leading zeros; default set to N; for latch operation: Y to enable latching; N to disable latching.

TODO

Will update this section once issues are discovered.

Contacts

suhrid.srivastava@gmail.com

Electromed/EmSevenSegment