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Fan controller that responds to 2 pwm input signals? - Page 4

post #31 of 35
All that Matters is your happy enjoy! Jvc was making one. Then disappeared :/ was gonna be pretty epic
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post #32 of 35
yeah indeed, whatever makes you happy smile.gif
If you want to build something that can read & interprete PWM signals, go ahead thumb.gif

Here is an alternate route of thinking.... a PWM fan already knows how to read a PWM signal. As a result of the PWM signal received, the RPMs will in/decrease. Intercept the RPM tach line and you've got a number. Do this with two PWM fans (each their own PWM signal source) and you have TWO tach RPM numbers... calculate the difference and use that
Problem: two fans that serve no other purpose than to read a PWM signal and "translate" it into a RPM signal smile.gif

Since the PWM signal is the result of a chip interpreting a TEMP sensor.. find which chip is responsible for that, how they are "wired" and buy a couple of them from the net.
BTW, i've seen PWM generators based on a 555 , using a simple 10kohm temp sensor ... the documentation or build log will certainly help you. google = friend smile.gif

Now, while its probably a nice learning experience and makes you happy, i think interpreting the PWM signals is taking the scenic route smile.gif

Its just easier to bypass all that, use temp probes or "grab" the readings thru OHM and use a mCubed T-Balancer or a HeatMaster to steer the fans (and pump and whatever else)

But i understand the urge to get the soldering iron out and wield it like a lightsabre. biggrin.gif
post #33 of 35
Thread Starter 
Quote:
Originally Posted by RnRollie View Post

Here is an alternate route of thinking....

Thnx for all that, you've definitely given me some things to chew on.
Quote:
Originally Posted by RnRollie 
But i understand the urge to get the soldering iron out and wield it like a lightsabre. biggrin.gif

Indeed, i believe you do biggrin.gif
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post #34 of 35
Thread Starter 
Ok, checkout what showed up in my mailbox today smile.gif



That's an arduino nano v3 plugged into a terminal adapter board.

I don't think I'll get around to playing with it till after Christmas. I need to run a sata power cable from my psu out an open pci slot up to a workspace on which I can wire together the nano + the powered phanteks fan hub + a dc fan. I'm not sure I've got a cable long enough? Then I can work on generating a pwm signal to regulate the speed of the fan... and then work on reading the pwm signal... etc...

My plan is to power the nano via USB and use the sata pwr cable for the fan and hub. I'm assuming the ground between the two power cables is common enough for a pwm signal generated by the nano to be read by the hub. Everything is being powered by the same PSU but from different cables. Sata pwr comes straight off the psu and I'll be using one of the mobo's rear USB ports. I'll have to test that assumption about common grounding with a dmm once I get cables run.
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post #35 of 35
Thread Starter 
Well I finally wrote my first arduino program to test the nano device i bought and to see if the tool chain works on my system. Check and Check. I haven't tested the pin io of the device yet, just made sure that serial comm works over usb.
Code:
#define MAX_CHARS 26

byte buffer_[MAX_CHARS];
int pos_;

void setup() {
  Serial.begin(9600);
  while (Serial.available() <= 0) {
    Serial.println("waiting for input"); 
    delay(500);
  }
  Serial.println("starting loop"); 
}

void loop() {
  if (Serial.available() > 0) {
    int c = Serial.read();
    buffer_[pos_++] = byte(c);
    if (c == '\n' || pos_ == MAX_CHARS)
      echo();
  }
}

void echo() {
  Serial.write("echo: ");
  Serial.write(buffer_, pos_);
  if (buffer_[pos_ - 1] != '\n')
    Serial.write('\n');
  pos_ = 0;
}

// output

waiting for input
waiting for input
waiting for input
starting loop
echo: hello
echo: howdy arduino!
echo: are you alive?
echo: i'm sorry
echo: but i don't think you
echo: pass the turing test
echo: just yet :)
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