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    Edwin De Bock

    @Edwin De Bock

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    Best posts made by Edwin De Bock

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    Latest posts made by Edwin De Bock

    • RE: Question: FL5150 LED Dimmer - replace a analog potentiometer with a digital one

      I just tested 2 led types with no flicker on my attiny circuit.
      It is funny, the expensive leds like from philips: Dimmable 3.8W Warm White have a flickering behavior .
      A cheap one available in Action from LSC 6.3W, Dim to Warm and 460 Lumen has no flickering behavior.
      Another one from Osram Par 1650: 5.5W Dimmable Warm White, 350 Lumen also has no flickering.
      The philips has the best Energy savings though : 4kWh compared to 7kWh for the LSC one.
      Is there a relation between energy savings and dim quality ?

      posted in Hardware
      Edwin De Bock
      Edwin De Bock
    • RE: Question: FL5150 LED Dimmer - replace a analog potentiometer with a digital one

      Hi @jimmyjames , I try to make a multi channel dimmer by myself based on your circuit.
      2022-12-22_11-54-15.png

      So I want to use a shared 12V power supply that galvanic separated from mains for my dimmers and also a shared ESP32. But when I read these comments I can not use a common gnd for both channels? Is there a solution for this. So I don't need to have for every channel a different power supply?

      With the attiny84 I have a dimmer as well. With this design I can make multi channel dimmers because the mains is completely isolated from the DC part.
      See picture:
      2022-12-22_12-01-10.png
      Another advantage is that the I2C addresses can be programmed in the attiny so I am not limited in the number of addresses.
      But when testing this approach I have not that good results in the low dimming , my led bulbs are flickering. So I want to try if the fl5150 is doing a better job.
      The flickering starts if I am dimming at 15% .
      See the oscilloscope pictures:
      flickering.jpg
      not flickering.jpg

      First one is if I dim at low percentage then the flickering starts.
      The second one is at a level when flickering stops.

      Do you think the FL5150 will do here a better job, or can my circuit of the attiny84 being improved to get the dimming correct at the lower levels?

      BR,
      Edwin

      posted in Hardware
      Edwin De Bock
      Edwin De Bock