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The two 7 segment displays using 4094 and arduino

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your1click

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Two 7 segment display using 4094 and artuino

Hi all,
I tried to use two display interface with 4094 and arduino, how to send data to 4094, I sent 0-9 and its going for both display so how to send separate data for one display only without changing another display value. bellow I have uploaded circuit image file.

2018-03-23 at 10-48-15.png

Here is my code
#include <z7seg_led.h>
#include <SPI.h>

const int CE = 8;
const int OE = 9;
const int sw = 3;
const int sw2 =4;


z7seg_led display(OE, CE);

void setup() {
SPI.begin();
display.begin();
display.set_type(z7seg_led_74hc4094);
display.set_pattern("ABCDEFG."); //
pinMode (sw, INPUT);
pinMode (sw2, INPUT);
}

void loop()
{
int stateButton = digitalRead(sw);
if(stateButton == LOW) { //if is pressed
static int i = 0;

display.begin_transfer();
display.send_digit(i++);
display.end_transfer();

if (i >= 10) {
i = 0;
}

delay(250);

}
else
{
stateButton = digitalRead(sw2);
if (stateButton == LOW) {
static int p = 0;
display.begin_transfer();
display.send_digit(p++);
display.end_transfer();
if (p >=10) {
p = 0;
}
delay(250);
}
}
}
Click to expand...

I used two switch and I want to change value from sw to display one value and from sw1 to display two value
but now If i change value its changing both together. so please help me
 

Re: Two 7 segment display using 4094 and artuino

Hi,

I didn't go through your code...

You need to do:
* output CE
* output STB
* output 16 x (data + clock)
* output STB
* output CE
(I said "output" because I don't go through the datasheet if they need to be 1 or 0)
****
Data + clock: waveform and timing according datasheet. The first 8 bits for the upper display, the second 8 bits for the lower display.

Klaus
 

Re: Two 7 segment display using 4094 and artuino

can you tell me in details 8 bits for upper and 8 bits for lower display? and can't I send direct 1,2,3,4,5,6,7,8,9,0 to upper display and lower display ?
coz i used 2 button and how to choose which bits for upper or lower >
 

Re: Two 7 segment display using 4094 and artuino

Hi,

What do you mean with "direct sending"?

4094 is a 8 stage shift register, serial in, parallel out. One data input.
To control the outputs you need to shift 8 bits in...
For two 4094 in series you need to shift 16 bits.

Did you read the datsheet?
Did you understand it´s function?

Klaus
 

Re: Two 7 segment display using 4094 and artuino

Yes I read it, and direct sending mean, I sent data 0-9 it's working for single display and now I added another display and I sent data 0-9 its showing in both display. now I gave a name display1 and display2. and display1=value; display2= value. Its showing also but problem is now I want to send value only in display1 so I sent display1=value but that value is showing in both display, which i set value before it replaced by new value. which i didn't gave comment for display2
 

Re: Two 7 segment display using 4094 and artuino

Hi,

another try to explain:

both displays are daisy chained.

Microcontroller --> display1 (8 bits) --> display2 (8 bits)

Thus you need to shift out always informations for both displays. always 2 x 8 bits. always: 8 bit data for display2 then 8 bits for display1

***
If you just shift out 8 bits, then the (previous) contents of the first display are shifted to the second dsiplay.

Klaus
 

Re: Two 7 segment display using 4094 and artuino

You have to shift 16 bits of data say 8 and 9 and then you have to give to latch its output.
 

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