Hey Arduino ninjas!
I have one main question and then a smaller much easier question if i may.
Im working with a little project to create some 7 segment displays. Overall there will be 4 or 5 one or two digit displays doing some very basic counting tasks.
Ive got the two segment display working after adjusting some code i found online and it works perfectly.
I'm now at the stage where i want to add the second one segment display.
My main question is can i get this to work using the same shift register and outputs on the Arduino or will i need another set of outputs and shift register?
Here's a diagram of what im trying to do..... The display on the right works perfectly.
The one on the left is the one i need to get working with the additional buttons.
The idea being i want to add a few more to this as well so it needs to be scalable.
This is my code i'm using.... (modified from the original on Simple Circuit) which works fine for the 2 digit display on the right.
/*
* 7-segment display with 74HC595 shift register
* 2-Digit counter example.
* Common anode 7-segment display is used.
* This is a free software with NO WARRANTY.
* https://simple-circuit.com/
*/
// counter button definition
#define button1 A0 // increase
#define button2 A1 // decrease
#define button3 A2 // reset
#define button4 A3 // increase
#define button5 A4 // decrease
#define button6 A5 // reset
// shift register pin definitions
#define clockPin 7 // clock pin
#define dataPin 6 // data pin
// common pins of the four digits definitions
#define Dig1 2
#define Dig2 3
#define Dig3 4
// variable declarations
byte current_digit;
int count = 0;
void disp(byte number, bool dec_point = 0);
void setup()
{
pinMode(button1, INPUT_PULLUP);
pinMode(button2, INPUT_PULLUP);
pinMode(button3, INPUT_PULLUP);
pinMode(Dig1, OUTPUT);
pinMode(Dig2, OUTPUT);
pinMode(Dig3, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
disp_off(); // turn off the display
// Timer1 module overflow interrupt configuration
TCCR1A = 0;
TCCR1B = 1; // enable Timer1 with prescaler = 1 ( 16 ticks each 1 µs)
TCNT1 = 0; // set Timer1 preload value to 0 (reset)
TIMSK1 = 1; // enable Timer1 overflow interrupt
}
ISR(TIMER1_OVF_vect) // Timer1 interrupt service routine (ISR)
{
disp_off(); // turn off the display
switch (current_digit)
{
case 1:
disp( (count / 10) % 10 ); // prepare to display digit 2 (left)
digitalWrite(Dig2, LOW); // turn on digit 2
break;
case 2:
disp(count % 10); // prepare to display digit 1 (right)
digitalWrite(Dig1, LOW); // turn on digit 1
}
current_digit = (current_digit % 4) + 1;
}
// main loop
void loop()
{
if(digitalRead(button1) == 0)
{
count++; // increment 'count' by 1
if(count > 9999)
count = 0;
delay(200); // wait 200 milliseconds
}
if(digitalRead(button2) == 0)
{
count--; // decrement 'count' by 1
if(count > 9999)
count = 0;
delay(200); // wait 200 milliseconds
}
if(digitalRead(button3) == 0)
count = 0;
delay(200); // wait 200 milliseconds
}
void disp(byte number, bool dec_point)
{
switch (number)
{
case 0: // print 0
shiftOut(dataPin, clockPin, MSBFIRST, 0x02 | !dec_point);
digitalWrite(clockPin, HIGH);
digitalWrite(clockPin, LOW);
break;
case 1: // print 1
shiftOut(dataPin, clockPin, MSBFIRST, 0x9E | !dec_point);
digitalWrite(clockPin, HIGH);
digitalWrite(clockPin, LOW);
break;
case 2: // print 2
shiftOut(dataPin, clockPin, MSBFIRST, 0x24 | !dec_point);
digitalWrite(clockPin, HIGH);
digitalWrite(clockPin, LOW);
break;
case 3: // print 3
shiftOut(dataPin, clockPin, MSBFIRST, 0x0C | !dec_point);
digitalWrite(clockPin, HIGH);
digitalWrite(clockPin, LOW);
break;
case 4: // print 4
shiftOut(dataPin, clockPin, MSBFIRST, 0x98 | !dec_point);
digitalWrite(clockPin, HIGH);
digitalWrite(clockPin, LOW);
break;
case 5: // print 5
shiftOut(dataPin, clockPin, MSBFIRST, 0x48 | !dec_point);
digitalWrite(clockPin, HIGH);
digitalWrite(clockPin, LOW);
break;
case 6: // print 6
shiftOut(dataPin, clockPin, MSBFIRST, 0x40 | !dec_point);
digitalWrite(clockPin, HIGH);
digitalWrite(clockPin, LOW);
break;
case 7: // print 7
shiftOut(dataPin, clockPin, MSBFIRST, 0x1E | !dec_point);
digitalWrite(clockPin, HIGH);
digitalWrite(clockPin, LOW);
break;
case 8: // print 8
shiftOut(dataPin, clockPin, MSBFIRST, !dec_point);
digitalWrite(clockPin, HIGH);
digitalWrite(clockPin, LOW);
break;
case 9: // print 9
shiftOut(dataPin, clockPin, MSBFIRST, 0x08 | !dec_point);
digitalWrite(clockPin, HIGH);
digitalWrite(clockPin, LOW);
}
}
void disp_off()
{
digitalWrite(Dig1, HIGH);
digitalWrite(Dig2, HIGH);
digitalWrite(Dig3, HIGH);
}
// end of code.
How do i modify the loop to control the 2 displays separately?
Once i know how to do it for one i can crack on and do it for others myself.
And finally my second easier question is how can i modify the code to increase the button presses by 5 instead of just 1.
Many thanks
