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Exercises for session 2: Hardware access and MicropythonExercise 1:Connect to Micropython using a terminal emulator. Import the machine package: import machineMake 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 ( help(machine), help(machine.Pin) ) Instead of importing machine 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 value method of machine.Pin to accomplish this. Run this script using thonny or uPyCraft Write a script to switch the LED offExercise 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. -- Uli Raich - 2019-05-14Comments |