Difference: ExerciseSheets (7 vs. 8)

Revision 82022-10-20 - UliRaich

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META TOPICPARENT	name="ASP2022"

Exercises

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End of the second exercise session

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Third exercise session

Programming the user LED on the CPU card

Write a program that blinks the user programmable LED on the CPU card at a frequency of 1 Hz (500 ms on, 500 ms off)

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Improve the program printing the state only when there was a state change.

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Forth exercise session

Reading an analogue signal level from the slider potentiometer

Read the documentation of the ADC driver in the MicroPython manual
Connect the potentiometer to the triple base according to the table in Analogue Signals#PotConnections

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magenta
red
the middle LED becomes white

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#smallProject

A small project

As a small project, we are going to combine the reading of the ADC and the control of the rgb LED ring. As we saw, the ADC delivers values between 0 and 4095 (12 bits). We can divide this range in 7 slices, corresponding to the 7 LEDs in the ring. For the lowest slice, the top LED will be lit. Then we go clockwise around the ring: the next LED lit will be to the right of the first one. For the highest slice, the middle LED will be lit.

Very often, the color indicates the signal level: For low signal levels, we use "cold" colors (blue, cyan) for higher levels we use "hot" colors (magenta, red, white). The color for the top LED will therefore be blue, the color for the middle LED will be white.

Here is the color sequence:

LED number	color
1	blue
2	cyan
3	green
4	yellow
5	magenta
6	red
0	white

Read the slider value from the ADC, subdivide it into 7 slices and light the LED corresponding to the slide into which the ADC value falls. Use the color from the color table.

Uli Raich - 2022-10-14

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