Project – building a sensor monitoring logger

In this section, we build a sensor monitoring logger with an ESP32 and a DHT module. Here, we will store all sensor data in a CSV file on the microSD storage. We can visualize our sensor data from the CSV file using a visual tool such as Excel.

Let's start!

Designing our program

Technically, we can develop our logger project by designing a flow chart, as shown in the following diagram. We use a deep-sleep feature from the ESP32 chip to work with sleep mode:

Figure 4-6: Program design for the logger project

We can start implementing our program scenario based on the flowchart in figure 4-6 as follows:

• We will check if the program runs after sleep mode or not.
• If yes...