External data acquisition¶
Polling¶
Exercise 1: Example of polling programming¶
Based on the following diagram in which we have a linear potentiometer connected to an ESP32, create a script that publishes the data read from the potentiometer through the serial port with a frequency of 50Hz.
Exercise 2: Problem 1: Data loss¶
Include a push button and an LED, and modify the script so that each time the button is pressed, the state of the LED changes.
Exercise 3: Example of interrupt-driven programming¶
Solution to Problem 1: Hardware interrupts Modify the script so that each time the button is pressed, an interrupt is generated, preventing data loss.
Exercise 4: Problem 2: Loss of timing requirements¶
Change the button task so that each time it is pressed, an interrupt is generated and the LED blinks 5 times with a period of half a second.
Exercise 5: Example of timer¶
Solution to Problem 2: Timer interrupts Use a timer to make the LED blink with a half-second period and avoid loss of timing requirements.