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.