Phyton:
Import serial
From picamea import PiCamera
From time import sleep
camera = PiCamera()
ser = serial.Serial(`/dev/ttyACM0`, 9600)

val = 1
int_encode = b'1'
if (val==1):
    ser.write(b'1')
    sleep (0.2)
    print('val: ')

for i in range(5):
    sleep(5)
    camera.capture(r'/home/pi/3dpic/image%s.jpg'.format(i))

Arduino:
#include <AFMotor.h>
#include <Bridge.h>

AF_Stepper motor1(48, 1);
AF_Stepper motor2(48, 2);
unsigned int a;
unsigned int b;
float Winkel1;
float Winkel2;

void setup() { // put your setup code here, to run once:
Serial.beginn(9600);
Serial.println("Stepper test!");
motor1.setSpeed(50);
motor2.setSpeed(50); }

void loop() { // put your main code here, to run repeatedly:
if (Serial.available() > 1){
    a = 1*(Serial.read() - '0');
    b = 1*(Serial.read() - '0');
    Winkel1 = a*11.25;
    Winkel2 = b*20;
    motor2.step(Winkel1, BACKWARD, SINGLE);
    motor1.step(Winkel2, FORWARD, SINGLE);
}