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Using the amazing Pi-Blaster daemon I managed to control a connected RGB strip (to be exact: this particular one http://www.ledstripkoning.nl/led-strips-rgb/losse-ledstrips-rgb/5-meter-150-leds-rgb-led-strip/ and here in more detail). The LED is driven by a 24V power supply and connected through MOSFET's. However, I'm experiencing a rather annoying problem: when setting any value (0,2 or 1 for example), the led is not giving a constant result. To illustrate, please see this small video: https://youtu.be/qEt5gFcJue4

I've also tried using the default PWM (hard and software), which also results in (random) flickering.

Any thoughts on causes and possible solutions are highly appreciated; it's driving me nuts for days now.

Dennis Hunink
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    Could you explain what you are actually sending to the RGB strip and the type of strip? If possible include the script you are using in your question. – joan Sep 27 '15 at 14:40
  • Hi, thanks for answering! Using the instructions on https://github.com/sarfata/pi-blaster I use the terminal command echo "18=1" > /dev/pi-blaster. – Dennis Hunink Sep 27 '15 at 16:03
  • All that does is switch GPIO18 high (always on). All that will do is switch a LED on or off (depending on how the LED was wired). – joan Sep 27 '15 at 16:19
  • Exactly, that's the expected behavior. But instead I'm getting the result as seen in the video in the post started. – Dennis Hunink Sep 27 '15 at 16:27
  • On the installation: we're using a 24V RGB LED strip. It's is wired identical to this: http://mitchtech.net/raspberry-pi-pwm-rgb-led-strip/ (but instead of 12V we used a 24V power source). – Dennis Hunink Sep 27 '15 at 16:30
  • There are dozens of different RGB LED strips with very different methods of being driven. Without knowing what you actually have nobody can help. – joan Sep 27 '15 at 17:31
  • I've added some links to pictures of the LED and MOSFET's (taken from https://github.com/sarfata/pi-blaster/issues/51). – Dennis Hunink Sep 30 '15 at 10:41
  • Pictures don't tell us what we need to know, we need specific part numbers/datasheets – Steve Robillard Oct 03 '15 at 20:44
  • I already asked the seller of the LED-strip for the datasheet. Unfortunately he has to get those from the Chinese manufacturer, but due to holiday's there closed for a week. Hope to get the datasheet ASAP and will definitely post it here. Thanks for all the help so far! – Dennis Hunink Oct 04 '15 at 09:05

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