OK, so here we are, a couple of weeks down the
line from when I first made this thing and im
fiddling with it again! Why cant I leave things
alone?! Oh well, it usually turns out for the
In this additional page to my
previous guide, I will be showing you how to
add a couple of status LEDs to your Temperature
Controlled Fan Unit ;)
This is what im going to do, my
mission statement if you like :P...
There will be two LEDs, a red LED and a blue
LED. Now the blue LED will come on when the
temperature at the probe is below both of your
set temperatures, i.e. the fans are off. There
will be no LEDs on when your fans are at 5v.
Finally, the red LED will come on when your
fans are at 12v. Sound simple enough? Well here
The New Schematic
Now let me explain this. Its very
simple. The bits I have added are in red, and
you should be able to spot them easy enough
if you compare this and the old schematic.
The red LED is the one on the
left (high temperature alarm pin6), and the
blue the one on the right (high temperature
alarm pin7). The new resistor needs to be calculated
according to the LEDs that you use, we dont
want any nuked LEDs now do we? I only needed
one resistor because both my LEDs were the same
voltage and current. You will need to calculate
the resistor required for your particular LEDs.
If they are not the same you will need a resistor
for each LED rather than one for both.
Anyway, thats all the technical
stuff out the way - so now I can show you some
pics of mine with the LEDs added - wooo :) (As
you'll see ive also added some lovely trim)...
Hehe, the fingerprint scanner is back! ;)
Oooh, its a bit chilly in here
Argh! Im boiling!! (Yes the temp is the same
cos I had to change the boundaries to get the
led to come on) ;)
There, much nicer looking, and
for all those of you who dont have noisy delta
fans like me, youll be able to see whats going