Implementation

Having discussed the solution architecture, next, we will look at the firmware for each device. Let's retain the order we used while discussing the solution and start with the light sensor.

Light sensor

Here, we will integrate a TLS2561 light sensor module into the light sensor device and use an LED as the indicator during provisioning. The following Fritzing diagram shows the connections:

Figure 9.5 – Light sensor diagram

Let's prepare the development environment before coding. Here are the steps:

1. Create a PlatformIO project with the following platformio.ini file:

   [env:az-delivery-devkit-v4]
   platform = espressif32
   board = az-delivery-devkit-v4
   framework = espidf
   monitor_speed = 115200
   lib_extra_dirs =
       ../../common/esp-idf-lib/components
       ../common
   build_flags =
       -DCONFIG_I2CDEV_TIMEOUT=100000

   lib_extra_dirs shows the directories of the external...