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| Driving CC RGB LED directly from MPU without flickering (using 3 pins PWM) |
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| beduino:
--- Quote from: DaJMasta on November 07, 2019, 04:32:56 am ---Provided your PWM frequency is high enough, a few hundred Hz will do fine, even without any filtering the outputs will appear smooth and steady. --- End quote --- Probably red (R) channel is faulty in this CC RGB LED, since no chance to get nice red light spot - instead red ring apears and while trying to get yellow by mixing with green (G) I can see in the dark on white room ceiling slightly yellow only where this bloody red ring apears instead of smooth yellow intersection :palm: I've made this test without any MPU, just by connecting to VCC 4.1V instead of MPU PWM pins output, so PWM is not issue there for sure. I will try another RGB LED, since measured Vf voltages and calculated each RGB channel currents and they are close to designed value ~3mA: Latest circuit schematics I've already updated in my first post in this thread attached below, to show those caps in parallel to CC RGB LED channels to stabilize quite nice RGB LEDs current @ 2kHz PWM: |
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