Add Obstacle Detection

The script IR_Remote_Control.py makes your cyber:bot drive in whatever direction you send it — even into walls. If you have a Ping))) sensor, you can give your ’bot a bit of self-preservation behavior.

Additional parts needed:

• Ping))) Ultrasonic Distance Sensor (#28015)
• 2.2 k-ohm resistor from your robot’s Electronic Component Pack
• Jumper wires

The Ping))) sensor can go directly into the breadboard.

• Add the Ping))) sensor to the cyber:bot and connect its signal pin to P8, as shown below. You may need to re-position the IR receiver, but that is fine as long as its signal pin still connects to P10.

The script IR_Remote_Control_with_Ping is just an expansion of the original.  Up top, it adds from ping import *.   Then, it takes the entire contents of the while True: loop and wraps it in a nested conditional while loop.  This inner loop only executes while (ping(8).distance(’cm’)) > 15:.  If that condition is not true, meaning you have driven your cyber:bot close too an object, some new lines of code at the bottom of the conditional loop make the cyber:bot express its surprise and turn away until the obstacle is no longer detected.

• You will need to add the ping.py module to your project, just like you added the cyberbot.py and tv_remote.py before testing the remote.
• Change the project’s name from ir_remote_control to ping_servo_test. 
• Enter the script below, and then click Save.
• Click Send to micro:bit.  
• Disconnect the cyber:bot robot’s USB cable, and set it on the floor.
• Set the cyber:bot board’s PWR switcht to 2 and 

# ir_remote_control_with_ping

from cyberbot import *
from tv_remote import *
from ping import *

wL = 0
wR = 0
img = Image.HAPPY

bot(22).tone(2000, 300)

while True:

    while (ping(8).distance('cm')) > 15:
        num = ir(10).remote()
    
        if num == 1:
            wL = 0
            wR = -75
            img = Image.ARROW_SE
        elif num == 2:
            wL = 75
            wR = -75
            img = Image.ARROW_S
        elif num == 3:
            wL=75
            wR=0
            img=Image.ARROW_SW
        elif num == 4:
            wL=-75
            wR=-75
            img=Image.ARROW_E
        elif num == 5:
            wL=0
            wR=0
            img=Image.HAPPY
        elif num == 6:
            wL=75
            wR=75
            img=Image.ARROW_W
        elif num == 7:
            wL=0
            wR=75
            img=Image.ARROW_NE
        elif num == 8:
            wL=-75
            wR=75
            img=Image.ARROW_N
        elif num == 9:
            wL=-75
            wR=0
            img=Image.ARROW_NW
   
        display.show(img)
        bot(18).servo_speed(wL)
        bot(19).servo_speed(wR)
        
    display.show(Image.SURPRISED)
    bot(18).servo_speed(-50)
    bot(19).servo_speed(-50)
    bot(22).tone(500, 1000)