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Author Topic: pwm for 3w led driver not dimming  (Read 795 times)
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I am settingup a led system for aquarium and all is good except the led driver wont dim leds. Even if i connect dim pin of IC to ground which should turn led dimmer to 0 it stays at full current. The driver is from sure electronics and the ic is model numet mbi6551. Any help would be great.
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nr Bundaberg, Australia
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Any help would be great.
Then you had better provide some information. What code? What IC? What circuit? Link to driver, why should I have to google it?

We're not clairvoyant, but happy to help if we have enough information.

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Rob
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Rob Gray aka the GRAYnomad www.robgray.com

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Google isn't forthcoming - link to datasheet?
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I assume you are doing the same thing as I did for my LED aquarium lighting. I used the arduino to drive a set of 4 Meanwell Eln-60-48p pwm drivers.

Most LED drivers take a 10V pwm signal to power them, (the one's popular in the aquarium trade anyway) the arduino only outputs a 5V pwm signal and you will need a few components to ramp that up. It is a quite simple circuit, and I have schematics of mine, if you would like to see them see them send me an e-mail at mrmichaelblack@gmail.com

But for your problem when you are outputting a 0 to the pwm output on the arduino there should be a constant 0V, which would dim the drivers to 0 regardless of the signal level. I'd assume there is an issue with the code, wiring, or what pin you are using on your arduino.

Could you post your code?
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