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| | = Description = | | = Description = |
| − | A regular RGB LED is basically 3 LEDs (one red, one green, one blue) in parallel. This is not a smart LED, for smart LEDs see [[LED Ring NeoPixel]].
| + | This RGB LED is not smart - you use it like 3 LEDs.. |
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| − | [[File:Rgb-foto.JPG|200px]] | + | [[File:RgbIMG 9775.jpg]] |
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| | = How to connect it electrically = | | = How to connect it electrically = |
| − | The RGB LED is connected like 3 paralell LEDs. It is important that you need one resistor for each color! The resistor goes before the LED and not onto the common ground or common VCC.
| + | Text |
| − | There are different types: some have common cathode (GND/-), other versions with common anode (+/VCC). It is easy to check: connect Pin 1 via resistor to VCC and Pin 2 to GND - if it lights up it is common cathode.
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| − | You can use any free digital out pins on your board. In the example sketch it is 14, 26, 27 (good for Wifi-Kit ESP32) and you could use 2, 3, 4 for Aruduino Nano Connect RP2024.
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| − | [[File:Rgb-led.PNG|800px]]
| + | Image(s) |
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| | = How to control it in MicroPython = | | = How to control it in MicroPython = |
| − | Switching indiviual color on and off
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| | <syntaxhighlight lang="python" line='line'> | | <syntaxhighlight lang="python" line='line'> |
| − | from machine import Pin
| + | # todo |
| − | | + | # code goes here |
| − | blue = Pin(26, Pin.OUT)
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| − | green = Pin(27, Pin.OUT)
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| − | red = Pin(14, Pin.OUT)
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| − | | |
| − | blue.on()
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| − | green.off()
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| − | red.off()
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| − | </syntaxhighlight>
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| − | | |
| − | | |
| − | Controlling intensity
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| − | <syntaxhighlight lang="python" line='line'>
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| − | from machine import Pin, PWM
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| − | | |
| − | blue = PWM(Pin(26))
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| − | green = PWM(Pin(27))
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| − | red = PWM(Pin(14))
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| − | | |
| − | # set PWM frequency to 1000Hz
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| − | blue.freq(1000)
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| − | green.freq(1000)
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| − | red.freq(1000)
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| − | | |
| − | # have blue on at about 50% intesity | |
| − | blue.duty(512)
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| − | green.duty(0)
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| − | red.duty(0)
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| − | | |
| − | # have red and green at full intesity (mixed color) | |
| − | blue.duty(0)
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| − | green.duty(1023)
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| − | red.duty(1023)
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| | </syntaxhighlight> | | </syntaxhighlight> |
| | | | |
| | = A small Program in MicroPython = | | = A small Program in MicroPython = |
| | <syntaxhighlight lang="python" line='line'> | | <syntaxhighlight lang="python" line='line'> |
| − | from machine import Pin, PWM
| + | # todo |
| − | from time import sleep
| + | # code goes here |
| − | | |
| − | # connect it to Pin 26, 27, and 14 | |
| − | blue = PWM(Pin(26))
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| − | green = PWM(Pin(27))
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| − | red = PWM(Pin(14))
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| − | | |
| − | # base frequency for PWM is 1000Hz | |
| − | blue.freq(1000)
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| − | green.freq(1000)
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| − | red.freq(1000)
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| − | | |
| − | # this is a function to allows to give an "RGB"-Color to the LED
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| − | # duty take an argument from 0 to 2023... by multiplying the 0..255 by 4 we get 0 to 2020 - which seems close enough
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| − | def rgb(r=255,g=255,b=255):
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| − | blue.duty(b*4) # set duty cycle
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| − | green.duty(g*4) # set duty cycle
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| − | red.duty(r*4) # set duty cycle
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| − | | |
| − | # show some cases....
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| − | while True:
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| − | rgb(255,255,255) # white
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| − | sleep(1)
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| − | rgb(0,0,0) # off = black
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| − | sleep(1)
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| − | rgb(255,0,0) # red
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| − | sleep(1)
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| − | rgb(0,255,0) # gree
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| − | sleep(1)
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| − | rgb(0,0,255) # blue
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| − | sleep(1)
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| | </syntaxhighlight> | | </syntaxhighlight> |
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| − | [[file:Rgb-setup1.JPG|300px]]
| + | text |
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| − | [[file:Rgb-setup2.JPG|300px]]
| + | image(s) |
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| − | [[file:Rgb-setup3.JPG|300px]]
| + | = Related Tutorial Videos = |
| | + | change to the right video |
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| − | = Related Tutorial Videos =
| + | <youtube>0KGgYsEZcZM</youtube> |
| − | In this part of the tutorial, we show how to connect an RGB-LED and programming it with Micropython. We first look at what an RGB LED is by building one with 3 separate LEDs. We then look at switching it on and off and how to set the color using the duty cycle in the PWM output.
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| − | <youtube>https://youtu.be/K2m6ttZ1bJw</youtube>
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| | | | |
| | + | = Background = |
| | + | text |
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| − | [[Category:Actuators]]
| + | image(s) |
| − | [[Category:Electronic components]]
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