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Diffstat (limited to 'docs/library/pyb.LED.rst')
| -rw-r--r-- | docs/library/pyb.LED.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/library/pyb.LED.rst b/docs/library/pyb.LED.rst index 461ea57d31..aeeb75b8f1 100644 --- a/docs/library/pyb.LED.rst +++ b/docs/library/pyb.LED.rst @@ -25,6 +25,12 @@ Methods If no argument is given, return the LED intensity. If an argument is given, set the LED intensity and return ``None``. + *Note:* Only LED(3) and LED(4) can have a smoothly varying intensity, and + they use timer PWM to implement it. LED(3) uses Timer(2) and LED(4) uses + Timer(3). These timers are only configured for PWM if the intensity of the + relevant LED is set to a value between 1 and 254. Otherwise the timers are + free for general purpose use. + .. method:: led.off() Turn the LED off. |