Reef Angel Forum

I thought i read somewhere that pwm voltage should be between 0-10vdc. now i was trying to figure out how to make it 5v max, and couldnt find anything. Then i went and rechecked the products page and it says 10vdc. Can it be adjusted and how? i am assuming i can code it to make maximum 50%. I am talking about straight from the relay box. not the expansion.

thanks
Johnny

You can use the map function.

http://arduino.cc/en/Reference/map

You will need to remove the booster from the relay box and solder some jumper wires.
Even at 50%, the signal is still 0-10vdc, with 50% duty cycle.

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rimai wrote:You will need to remove the booster from the relay box and solder some jumper wires.
Even at 50%, the signal is still 0-10vdc, with 50% duty cycle.

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just jumper it straight across where the pins used to be? or is there an order?

You need to remove lm358 and resistors.
Then, connect the in to out with jumper wires

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Will do thanks.

I guess it was more involved than i thought sorry

Not a problem at all.

Easy mod.just De solder like said then connect jumpers from + volts in to out on both sides of the lm358...Thanks

I have my relay box open now. Can you guys describe in terms of pins what to do? Thanks!

Jumper 1 and 3 together and 5 and 7 together.

rimai wrote:You need to remove lm358 and resistors.
Then, connect the in to out with jumper wires

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Sorry to ask again. "Measure twice, cut once."

I'll remove R19, R20, R21, R22 and the LM358 (IC1), then jumper as described. Correct?

Yes.

Roberto if i want change the actinic port from 0-10 to PWM and oposite what must do or remove?

Unless you have one of the latest board revisions (rev 8.1), it will be very hard for you to do this.

How can i see that? I order my RA Noveber 2012.

Opening the box, but I'm almost positive the rev 8.1 wasn't around at that time.

ok!!!Thanks Roberto!

Life got in the way but 8 months later I made this change and it works perfectly. Thanks Roberto.