Hi Everyone,I'm very new to this and have a question i can't seem to find an answer on.I have an LED aquarium project where strings of LED's are controlled by buckpacks / drivers. My drivers accept a 0-5V pwm input.Each of these drivers accept an PWM input to control the output current.My problem is, I have a lot of drivers.
Can i split a single PWM output from my Arduino Mega to drive two or three LED drivers? Or will this affect the 0-5v signal the pwm output each driver would receive if i was try and run more than one driver off one pwm output?
Thanks for the replies everyone.I'm planning on running a maximum of 2 drivers off one single pwm output.So will I need a buffer?As the PWM is a logic level input signal to the drivers I would think you would have no problems driving two such input pins with an arduino output pin, AVR output pins are quite strong compared to standard TTL output drive standards.I have the spec sheet for the drivers however there's no mention about the current draw on the pwm input.What you can't be certain of is if two different drivers will track identically over the 0-100% PWM range. That is a 50% PWM output may not give you 50% brightness when using two different driver modules wired to their LEDs. You can only try it and see if that might be a visual problem or not.LeftyRegardsDanAustralia
Thanks for the replies everyone.I'm planning on running a maximum of 2 drivers off one single pwm output.So will I need a buffer?
To be save, put a small resistor (1k for example) between the mega's output pin and all the drivers' input pins to see if that will work, if you cannot find the spec for the drivers.
1 or 2 ohm resistor