Summary

We explored many new things in this chapter, you need a pat on the back for getting through this!

Let's summarize what we learnt:

• How an Ultrasonic transducer works by measuring the time taken for sound to bounce off an object
• The math to calculate the distance would be:

  Distance= (time taken for reflected sound to travel x speed of sound in air)/2

• We revisited how conditional statements work
• We looked at how to add and initialize Arduino Libraries by using a #Include at the start of out code
• We saw how we use Library functions after initializing an object of that library, by using objectName.functionName()
• We finally used all that we learned and built our toy friend whose smile lights up when you approach it!