Session2 < AFNOG

---+ Exercises for session 2: Hardware access and Micropython
---++ Exercise 1:

Connect to Micropython using a terminal emulator.

Import the machine package:

<i>import machine</i><br /> Make Micropython known that our built-in LED is connected to GPIO pin 2 and set this pin to output mode.

Switch the LED on.

Switch it off again

Take https://docs.micropython.org/en/latest/esp8266/tutorial/pins.html as reference

Try the _help_ function to get information about the machine package and the Pin module<br /> ( help(machine), help(machine.Pin) )

Instead of importing <i>machine </i>import machine.Pin:

_from machine import Pin_

How do you access the GPIO now?
---++ Exercise 2:

Write a script to blink the built-in LED. Use the <i>value </i>method of machine.Pin to accomplish this.

Run this script using thonny or uPyCraft

Write a script to switch the LED off
---++ Exercise 3:

Change the brightness of the LED using PWM.

https://docs.micropython.org/en/latest/esp8266/tutorial/pwm.html

Write a script similar to the one shown during the lectures cycling the brightness of the LED. Instead of using a sin function as shown during the lectures, use a triangular function.
---++ Exercise 4:

Connect the WS2812 rgb LED to the !WeMos D1 mini CPU. Just stack it onto the CPU card.

*Before powering the sandwich, please put a piece of paper on top of the LED. The LED is extremely bright and looking straight into it might damage your eyes!*

Write a script that powers only the red, then only the green, then only the blue LED. Have the individual LEDs on for 1s and cycle through the colours 5 times. Then switch off the LED.
---++ Exercise 5:

Cycle through the colours showing the full potential of the WS2812.
---++ Exercise 6:

Disconnect the WS2812 and connect the SHT30 temperature and humidity sensor instead. Have a look at the description of the !I2C class:

https://docs.micropython.org/en/latest/library/machine.I2C.html

Have a look at the code of the i2cScan.py script and make sure you understand it. Run it. On which !I2C address can your SHT30 be addressed?
---++ Exercise 7:

Have a look at the SHT30 driver sht30.py. You can find it at:

https://github.com/uraich/MicroPython_IoTDemos/tree/master/drivers/sht30

Which methods would you use?

Write a script to measure and read out temperature and relative humidity every 2 s and print the results.

-- %USERSIG{UliRaich - 2019-05-14}%

---++ Comments

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This topic: AFNOG > WebHome > AFNOGWorkshop2019 > AFNOG-2019Slides > WorkshopExercises > Session2
Topic revision: r1 - 2019-05-14 - UliRaich