For this chapter, you can optionally use a second Raspberry Pi with Wireless internet access. You can also just use the one you have and we'll pretend it is two different Pis. You'll also need your TSL2591 Light Sensor, your Pi Cobbler, and a few breadboard wires.
The code for this chapter is available at https://github.com/PacktPublishing/Hands-On-Robotics-with-JavaScript/tree/master/Chapter11.