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Really?!? Man, I AM behind the times. Is there somewhere I can read up on this? I didnt see anything in the documentation forum that looks to be of help.Quote:
Originally Posted by 2k1Toaster
You might want to check the wiring schematic for your cars climate controls. I know on mine that there are 4 fan speeds to choose from, chosen via a resistor placed on the power line to the motor. I'll just use 4 relays.Quote:
Originally Posted by Cocide
Actually mine is exactly the same, but I was wanting to change that to a finer control so the motor can ramp up or slow down, plus during the summer right between two settings is about perfect here... go figure.Quote:
I know on mine that there are 4 fan speeds to choose from, chosen via a resistor placed on the power line to the motor. I'll just use 4 relays.
The resistor limits the current to the motor it makes it spin faster or slower. In my setup it is a single power line that goes to the motor, it is not digitally controlled or anything fancy like that so it should be rather easy to change it.
... maybe there is a chip / part / board that can do this, google will tell, but first let me finish this paper thats due in about 2 hours.
In the Fusion Brain --> Software --> MDX Configurator thread is where the download link is.
In that case, PWM is it for you. Only problem is that the brain doesnt output fast enough to do PWM, I dont think. Your best bet might be some kind of serial port pwm controller..Quote:
Originally Posted by Cocide
I downloaded and played with it a bit, looks great! Perhaps a short tutorial on automatically controlling outputs based on inputs would help myself and others out? ;)Quote:
Originally Posted by 2k1Toaster
EDIT: very cool graphical function layout! I think i figured it out, mostly. This makes the brain quite powerful! Now if only i could figure out how to connect nodes so i could save my function..
MORE EDIT: Figured it out. Right click on the output of one node, left click on the input of the next..
I guess that if the pulse was 100x a second or faster there would not be too much strain on the motor, I just don't want to have to replace it in 6 months.Quote:
In that case, PWM is it for you.
Well I am planing on having a microcontroller to control the starter motor and door locks based on scanning a RFID tag in my hand (finally I shall never use a key for anything ever again.... I love my job). I figure I will just use a slightly more powerful one and have it be a servo controller (or blower PWM controller) for the HVAC.Quote:
Only problem is that the brain doesnt output fast enough to do PWM, I dont think. Your best bet might be some kind of serial port pwm controller.
one thing I did not take into concieration is if a relay will fire that fast or if the relay itself will become warn out.
Will I have to get a special relay to handle pulsing every 1 - 10 ms?
Yes, something with no moving parts would be best, solid state relay for example.Quote:
Originally Posted by Cocide
Having a mechanical relay kick back and forth at 100 to 1000 times a second is going to end in tears, not mention the buzzing will get very annoying very quickly I'd guess.
Well digikey it is then.
Thanks again for all the help.
The best way to control a blower i found is by using PWM with a high current solid state device, not a relay!!.Im actually currently working on a 15 amp PWM controller with 15 different speed seetings. This is designed to be an add-on to the fusion brain. The only thing is that you need to sacrifice 5 outputs. I also have another add-on that increases the availiable ouputs. Im sure the fusion brain could also make these, but im very impatient. If anyone needs more info let me know, im willing to help.
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