De waarheidstabel hiervoor is:
D
|
C
|
B
|
A
|
Decimaal
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
1
|
1
|
0
|
0
|
1
|
0
|
2
|
0
|
0
|
1
|
1
|
3
|
0
|
1
|
0
|
0
|
4
|
0
|
1
|
0
|
1
|
5
|
0
|
1
|
1
|
0
|
6
|
0
|
1
|
1
|
1
|
7
|
1
|
0
|
0
|
0
|
8
|
1
|
0
|
0
|
1
|
9
|
De code hiervoor is als volgt:
/*
Binary Counter with four LED's
The circuit:
* 4 LED's
* 1 220ohm resistor
Created 09/02/2012
By Reinoud de Lange (reinouddl@gmail.com)
adopted some code from Vito Magnanimo
*/
#define LED1 0 // pin of LED1
#define LED2 1 // pin of LED2
#define LED3 2 // pin of LED3
#define LED4 3 // pin of LED4
int a=0; // state of LED1
int b=0; // state of LED2
int c=0; // state of LED3
int d=0; // state of LED4
//there are auxiliary variables
int new_a=0; // used to store new LED1 state
int new_b=0; // used to store new LED2 state
int new_c=0; // used to store new LED3 state
int new_d=0; // used to store new LED4 state
void setup(){
pinMode(LED1,OUTPUT); //set all pin in OUTPUT mode
pinMode(LED2,OUTPUT);
pinMode(LED3,OUTPUT);
pinMode(LED4,OUTPUT);
}void loop(){
delay(2000); // wait 2s before to begin every cicle
// this is useful because if there isnt any
// delay we will not see anything
if (!a) new_a=1;
else new_a=0;
if( (b && !a) || (!b && a && !d)) new_b=1;
else new_b=0;
if( (!c && b && a) || (c && !a) || ( c && !b)) new_c=1;
else new_c=0;
if( (!d && c && b && a) || (d && !a)) new_d=1;
else new_d=0;
a=new_a; //now new value can be stored in the state variables
b=new_b;
c=new_c;
d=new_d;
//turn ON or turn OFF LED 1 2 3 4
if(a==1) digitalWrite(LED1,HIGH);
else digitalWrite(LED1,LOW);
if(b==1) digitalWrite(LED2,HIGH);
else digitalWrite(LED2,LOW);
if(c==1) digitalWrite(LED3,HIGH);
else digitalWrite(LED3,LOW);
if(d==1) digitalWrite(LED4,HIGH);
else digitalWrite(LED4,LOW);
}
En dat ziet er dan als volgt uit:
Hierna kunnen we met de BCD to 7-segment driver het display aansturen. Maar dat is voor het volgende experiment: "Arduino - Experiment 3b - BCD naar 7-segments display".
