In this exercise we will find out how far an object is from our robot.

Add Code for Distance Sensor

• Observe the pins on the distance sensor. Note the pins labeled Trig and Echo
• In the wallfinder tab, create a variable to hold the trigger pin location. Set this to 8
• Declare a variable to hold the echoPin location. Set this to 12.

• In the wallfinder setup method, set the pin mode for the trigger and echo pins

• Add a distance function that looks like the one below

Wiring the Distance Sensor

• Connect the echo pin on the distance sensor to the echo pin on the circuit board
• Connect the trigger pin on the distance sensor to the pin labeled trig on the circuit board
• Connect the Ground pin on the distance sensor to the GND pin on the sensor pins on the circuit board
• Connect the VCC (power) pin on the distance sensor to the VCC pin on the sensor pins on the circuit board.

Testing

Update you loop method to:

• Call the distance method
• wait 1 second

This time when you run your code select Tools -> Serial Monitor from the menu. This will allow you to see the print statements in the distance function