![]() ![]() ![]() PWM library (Arduino 2.7.4, Arduino 3.0.2, new_pwm).Out any further calibration of the lux levels)įor every combination of PWM configuration settings, given by: Sensor pointing at the LED strip (since only relative changes inīrightness in response to PWM input are of interest I did not carry effective lux output of the LED strips is measured using a TCS34725.each GPIO/transistor input is pulled down by a 100K resistor (toĪvoid bright flashes on startup when the output pins are still.…which are powered from a 12V 5A power supply.…each switching the drain from the two LED types of a 5m tunableĬolor temperature white LED strip (2836 type)…. ![]() …outputting PWM on GPIO14 (aka D5) and GPIO13 (aka D7)….Measurement loop() for Stefan Bruen’s new_pwm.Measurement loop() for default Arduino IDE ( analogWrite()).Other: duty cycles of 4 ticks or less (i.e. 160ns or less) don’t switch the LED on at all.Arduino PWM only: discontinuities/dips at around 10% (.1) duty cycle at low PWM frequencies/high analogWriteRange()s Arduino PWM only: flattening out (i.e. identical LED output) above 90% (0.9) duty cycle Arduino PWM only: flattening out (i.e. identical LED output) for a wide range of different duty cycles at the left of the graph Arduino PWM only: missing data (= LEDs completely off) for shorter duty cycles at smaller analogWriteRange()s missing data (= LEDs completely off) for shorter duty cycles at higher PWM frequencies brightness differences between single-LED and both-LED modes Strips, and use the LEDs’ brightness output as a proxy for PWM Rather than using an oscilloscope to inspect the raw PWM output, IĬonnected two transistors to the PWM outputs to drive dimmable LED (both v2.7.4 and v3.0.2) and Stefan Bruen’s ESP8266 software PWM performance comparison for controlling 12V LED stripsĪ practical performance comparison of the of the default software PWM ![]()
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