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42 lines
912 B
Markdown
42 lines
912 B
Markdown
---
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title: "RGB LED"
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aliases:
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- tutorials/all/rgbled.html
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- tutorials/all/rgbled.md
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- chapter/tutorials/all/rgbled
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---
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By default the heartbeat LED flashes in blue colour once every 4s to signal that the system is alive. This can be overridden through the `pycom` module.
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```python
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import pycom
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pycom.heartbeat(False)
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pycom.rgbled(0xff00) # turn on the RGB LED in green colour
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```
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The heartbeat LED is also used to indicate that an error was detected.
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The following piece of code uses the RGB LED to make a traffic light that runs for 10 cycles.
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```python
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import pycom
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import time
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pycom.heartbeat(False)
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for cycles in range(10): # stop after 10 cycles
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pycom.rgbled(0x007f00) # green
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time.sleep(5)
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pycom.rgbled(0x7f7f00) # yellow
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time.sleep(1.5)
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pycom.rgbled(0x7f0000) # red
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time.sleep(4)
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```
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Here is the expected result:
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