Connecting the STM32 Blue Pill board to the internet
The previous code snippets sense a sensor to measure the temperature and send the sensed data to the internet.
When the user requests the temperature from the web browser, the STM32 microcontroller will receive a request to blink an LED and consequently link it to our IoT environment created with the ESP8266 Wi-Fi module.
Figure 9.18 shows the connections required to interface the STM32 and the SP-01:
Figure 9.18 – Connecting the STM32 to the internet
Figure 9.19 shows the actual device connections between the STM32 and the SP-01:
Figure 9.19 – Physical connections between the STM32 and SP-01
To complete the connection between the STM32 and the SP-01, we need to add a few lines of code to the Chapter09/wifi script:
const int toInternetPin = 0;
In the preceding line, add a constant to store the input pin used to receive the data from the internet...