RGB LED

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.

import pycom

pycom.heartbeat(False)
pycom.rgbled(0xff00)           # turn on the RGB LED in green colour

The heartbeat LED is also used to indicate that an error was detected.

The following piece of code uses the RGB LED to make a traffic light that runs for 10 cycles.

import pycom
import time

pycom.heartbeat(False)
for cycles in range(10): # stop after 10 cycles
    pycom.rgbled(0x007f00) # green
    time.sleep(5)
    pycom.rgbled(0x7f7f00) # yellow
    time.sleep(1.5)
    pycom.rgbled(0x7f0000) # red
    time.sleep(4)

Here is the expected result: