Well done! You made it to the end of the chapter and you have built a project from scratch!
You have built the hardware, along with the electronic circuit, and written the software for both Arduino and iOS.
On Arduino, you have learned how to use analog and digital sensors (1-Wire), how to write the code for reading them, how to control a servo motor, and how to handle the communication with the iOS devices.
On iOS, you have learned how to write an application with a simple user interface and that the application's communication with Arduino via Bluetooth 4.0.
We eventually discussed analog and digital sensors and some of the most used low-level communication protocols for exchanging data with Arduino.
In the next chapter, we will build another ...