This being the last chapter, let's try to complete the following exercise before concluding this journey:

• Refer to the information provided in Chapter 5, Day 3 - Building a Compound Device, and build a connected smoke detector. The connected smoke detector should send data to the IoT cloud whenever smoke is detected. Reuse the ESP8666-01 chip, the ThingSpeak IoT cloud, and the relevant sections from the sketch in this chapter for posting data to the cloud.