IoT Engineering

Hands-on of lesson 2

For slides and example code, see lesson 2

Note: Do not work on this repository right away.
Create your personal copy by clicking this GitHub Classroom link.

a) LED (digital output), 5'

• nRF52840 or ESP8266 w/ Grove:
• Connect to adapter port D2.
• Maps to ESP8266 pin 2.
• Or nRF52840 pin 5.
• Adapt this code.

b) Button (digital input), 5'

• nRF52840 or ESP8266 w/ Grove:
• Connect to adapter port D2.
• Maps to ESP8266 pin 2.
• Or nRF52840 pin 5.
• Adapt this code.

c) Button-triggered LED, 15'

• This works with nRF52840 or ESP8266, w/ Grove.
• Connect the LED to port D2, and the button to D4.
• Combine the previous examples to switch the LED.
• Look up the pin mapping to adapt the pin numbers.

d) State machine, 5'

• 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()

e) Sensing light (analog input), 5'

• nRF52840 or ESP8266 w/ Grove:
• Connect to adapter port A0.
• Maps to ESP8266 pin ADC.
• Or nRF52840 pin A0.
• Adapt this code.

f) Temperature (DHT11), 5'

• DHT11 sensors require a library.
• Connect to adapter port D2.
• Maps to ESP8266 pin 2.
• Or nRF52840 pin 5.
• Adapt this code.
• New to libraries? See Arduino Wiki page.

g) Kitchen timer, 30'

• 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().

h) Homework, max. 3h

• Implement or finish the kitchen timer you designed.
• Document the timer state machine (PDF or PNG).
• Commit the code and docs to the hands-on repo.
• Bring the (working) timer to the next lesson.

Submitting results

• Commit and push local changes to your repository.
• Want a review? Create an issue, mention me (@tamberg).

Tools

Git

On your computer

• In the hands-on repository fork for your class, in README.md, click the GitHub Classroom link.
• Once you accept the assessment, you get a personal, private repository URL for your USER_NAME:

  http://github.com/fhnw-iot-CLASS/fhnw-iot-work-02-USER_NAME

On your computer or Raspberry Pi

• Clone the repository

  $ cd ~
  $ git clone REPO_URL

• Add a file

  $ git add FILE

• Commit changes

  $ git commit FILE -m "Fixed all bugs"

• Push changes

  $ git push

Wiki

• IoT Engineering Wiki

Support

• IoT Engineering Slack