IoT Engineering

Hands-on of lesson 2

For slides and example code, see lesson 2

Note: Do not work on this repository right away.
Check existing forks to find the specific repository for your class.

a) Button-triggered LED, 15'

Connect the LED to port D2^*, and the button to D4.
Combine the previous examples to switch the LED.
^*On the ESP8266, remove LED for programming.
Look up the pin mapping to adapt the pin numbers.

b) State machine, 15'

Copy and complete the code of the state machine.
Make sure it works, with a button and LED setup.
Change it to switch off only, if the 2nd press is long.
Let's define long as > 1s, measure time with millis()

c) Kitchen timer, 15'

Design a kitchen timer to the following specification:
Displays a countdown to 0, in minutes and seconds.
Let's the user reset to 00:00, enter a new timespan.
Allows the user to start the countdown at mm:ss.
Starts buzzing if the countdown reaches 00:00.
Use a state machine, get the time with millis().

d) Challenge

Build and implement the kitchen timer you designed.
Document the timer state machine (ASCII or image).
Commit the code and docs to the hands-on repo.
Bring the (working) timer to the next lesson.