Difference: LEDsAndNopNeoPixel (5 vs. 6)

Revision 62020-08-09 - UliRaich

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LEDs and NeoPixel

Introduction

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The ESP32 has 2 LEDs on board. The first one indicates power while the second one is user programmable. The user programmable built-in LED is connected to GPIO pin 2.

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The ESP32 has 2 LEDs on board. The first one indicates power while the second one is user programmable. The user programmable built-in LED is connected to GPIO pin 19.

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You can see the LEDs in the far left, bottom corner. The power LED is marked "ON" while the user programmable one is marked "L".

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Exercise 4: Change the LED light intensity

The light intensity on the LED can be changed if we do not supply a fixed signal level to it but a frequency. The duty cycle of the signal determines the light intensity. This is called Pulse Width Modulation or PWM for short. Write a program that increases the intensity in a linear fashion and the decreases it again linearly.

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Uli Raich - 2020-05-05

Exercise 5: The WS2812 addressable LED

The WS2812 LED is often used in LED chains. It is an RGB LED using a single data line which can be cascaded. It has a data in pin and a data out pin where the data out pin is connected to the data in pin of the following LED. It uses a serial protocol that must be precisely timed. For more information please consult the data sheet. Fortunately a driver for the WS2812 running on the ESP32 is already integrated into the MicroPython binary.

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Exercise 7: Change to CCW

In exercise 6 the LEDs will turn on clockwise (cw). Modify the program such that the LEDs turn on counter clock wise (ccw).

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The exercise sheet in odt format:

https://afnog.iotworkshop.africa/pub/IoT_Course_English/LEDsAndNopNeoPixel/exercise_2_modified.odt

-- Uli Raich - 2020-05-05

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