Configuring more than 2 pins of GPIO

Question

import time
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(16, GPIO.OUT) 
GPIO.setup(26, GPIO.OUT) 
GPIO.setup(5, GPIO.OUT)  
GPIO.setup(6, GPIO.OUT) 


print ("Car is moving Forward.")
GPIO.output(16, 1)
GPIO.output(26, 1)
time.sleep(4)


print("Car is moving backward.")

GPIO.output(5,1)
GPIO.output(6, 1)
time.sleep(3)

GPIO.cleanup()

Now, the shell is print 'Car is moving forward' and also, my robot tires are moving forward. then, 'Car is moving backward' print is being print but Robot tires are not moving backward. What am I doing wrong in the code?

Answer 1

You should be setting both GPIO's connected to each motor input, not the single GPIO per motor you are setting. To drive the first motor you set one GPIO high and the other low, to reverse the direction you reverse the pins setting the opposite pins low and high. Assuming GPIO 16 and 26 are one motor you need to set one high and the other low, like this:

print ("Car is moving Forward.")
GPIO.output(16, 1)
GPIO.output(26, 0)
time.sleep(4)

and to change the rotation:

print ("Car is moving Backward.")
GPIO.output(16, 0)
GPIO.output(26, 1)
time.sleep(4)

and obviously the same for the other motor.