In this chapter, we discovered how to detect sound and light levels by using specific sensors and how to write a simple Bash script to implement a state machine to manage our laundry room. Also, we discovered how to send some alerting messages to a smartphone through the WhatsApp service.

In the next chapter, we'll try to implement a baby room sentinel to control what happens to our little baby! We'll be able to monitor the room temperature, detect if the baby is crying or if she is actually breathing, and much more.