Author Topic: Adding LED (or?) to shield fan help  (Read 5939 times)

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Offline dupreezd

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Re: Adding LED (or?) to shield fan help
« Reply #50 on: June 24, 2017, 01:25:52 PM »
the fan wires are the same as this. The blue wire is the PWM to control the speed of the fan.
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« Last Edit: June 24, 2017, 01:27:29 PM by dupreezd »
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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #51 on: June 24, 2017, 01:34:05 PM »
I think this fan will do the job, once i have cut off the corners, it should fit in the Davis shield :)


Nearly forgot the diode, will this suffice?
« Last Edit: June 24, 2017, 02:11:59 PM by Bashy »
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Offline dupreezd

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Re: Adding LED (or?) to shield fan help
« Reply #52 on: June 24, 2017, 03:03:34 PM »
Wow fancy fan. Maybe you can use a lightpipe to bring the blue light out. :-) :lol:
https://www.youtube.com/watch?v=7CQnRARsk4E

No, that is a Zener diode. It is used in small power supplies to produce specific voltages. In this case 12V.
Look for 1N4001 to 1N4007, a very common diode.
« Last Edit: June 24, 2017, 03:07:31 PM by dupreezd »
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Offline Bashy

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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #54 on: June 26, 2017, 02:48:06 AM »
Before my parts arrive, just going over it again, just one question at present, this part

Quote
With the fan stalled in any position, only one led is on.

Why does it need this 2nd LED to be on? can that LED be remove then when the fan stalls no LED's are lit?
IM sure theres a reason  for the 2nd LED, i am just not leccy savvy enough to understand it
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Offline WeatherHost

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Re: Adding LED (or?) to shield fan help
« Reply #55 on: June 26, 2017, 03:25:09 AM »
I'm not sure why you're opposed to the Tachometer idea.  With the fan stalled, the display would be '0'.  No question of on or off.  With the fan obstructed or inhibited in some way, the displayed reading would be much lower than normal which would let you know there was a problem before it failed.  The on/off LED system would not provide that information.

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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #56 on: June 26, 2017, 03:27:52 AM »
I don't need that information, I need a simple, is it on or is it off and It needs to be visible and not having to go into the summer house and look.
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Offline vreihen

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Re: Adding LED (or?) to shield fan help
« Reply #57 on: June 26, 2017, 05:59:59 AM »
Why does it need this 2nd LED to be on? can that LED be remove then when the fan stalls no LED's are lit?
IM sure theres a reason  for the 2nd LED, i am just not leccy savvy enough to understand it

If I understand the original circuit design correctly, the tachometer sends down a signal that goes on/off rapidly to indicate fan RPM.  If you stop the fan, it either sends down a 0 or a 1...depending on the position of the fan blade when it stopped.

What this circuit does is light up one LED for 0, and the other LED for 1.  When the fan is spinning normally, the stream of 0's and 1's keep both LED's lit to the human eye.  When the fan stops, only one LED will be lit up...and which one depends on the position of the fan blades when it stopped.

At least this is my understanding of the circuit, but maybe I'm confused.....
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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #58 on: June 26, 2017, 06:10:59 AM »
Ah, sounds good to me if it's right or wrong ha ha ha
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Offline dupreezd

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Re: Adding LED (or?) to shield fan help
« Reply #59 on: June 26, 2017, 07:45:44 AM »
Quote
If I understand the original circuit design correctly, the tachometer sends down a signal that goes on/off rapidly to indicate fan RPM.  If you stop the fan, it either sends down a 0 or a 1...depending on the position of the fan blade when it stopped.

What this circuit does is light up one LED for 0, and the other LED for 1.  When the fan is spinning normally, the stream of 0's and 1's keep both LED's lit to the human eye.  When the fan stops, only one LED will be lit up...and which one depends on the position of the fan blades when it stopped.

Vreihen, you scored 100% on this test. Your exactly right.  :-)
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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #60 on: June 26, 2017, 08:39:22 AM »
My parts. Should be with me by the end if the week
I have just found a spare 3 wire fan too sods law that....
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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #61 on: June 27, 2017, 05:37:22 AM »
Hi, just noticed by blowing a load of LED bulbs that they are well under 12v, do those resisters lower the voltage? or do i have to buy some more LED's?

Blue  3.2v - 3.4v | 20mA |
Green 3.2v - 3.4v | 20mA |
Yellow 1.8v - 2.2v | 20mA |
Red 1.8v - 2.2v | 20mA |
White 3.2v - 3.4v | 20mA |

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Offline dupreezd

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Re: Adding LED (or?) to shield fan help
« Reply #62 on: June 27, 2017, 07:51:06 AM »
Bashy, you can never ever connect a LED directly to most power sources.

Reply 25 by W9LRT is a very good guideline to prevent blowing LED's. Note the 2v
Quote
On an LED, the cathode is typically the shorter lead.  General rule of thumb is most LED's run on 2 volts.  Series resistors are typically 100 ohms per volt you want to drop.  For instance starting with 12 volts, you want to drop 10 volts (to get to the 2 volt operating level), so 10 x 100 would be 1000.  A 1000 ohm series resistor will get you close.  Adjust that up or down to increase or decrease brightness (within reason or you will toast the LED)

Here is a very good tutorial
https://learn.sparkfun.com/tutorials/light-emitting-diodes-leds
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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #63 on: June 27, 2017, 08:16:56 AM »
Ah, thanks for that  #-o
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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #64 on: June 30, 2017, 07:56:36 AM »
Hi, I, finally got all the parts today and put it all together, i dont think i have anything wrong, but,
The LED's are very dim, i doubt i would see them in the dark let alone daytime lol, not sure where
i have gone wrong, i have however uploaded a short video to youtube, perhaps someone can see
if and where i have gone wrong please?

https://youtu.be/GScGohpCsZI
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Offline dupreezd

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Re: Adding LED (or?) to shield fan help
« Reply #65 on: June 30, 2017, 08:59:10 AM »
Bashy, good job  =D> You have done nothing wrong.

Those clear LED's are more directional than the diffused ones and I think require a little more current.
Are those 1k resistors?

Quote
i doubt i would see them in the dark let alone daytime lol,
Same here, I can only see mine at night, but I think it is because I used green. I might change it to red during the next maintenance.
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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #66 on: June 30, 2017, 10:40:54 AM »
I thought that's what I ordered 1k,they are 1/4 1% kit

What part is restricting the power to the led, is it the resistors?
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Offline Old Tele man

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Re: Adding LED (or?) to shield fan help
« Reply #67 on: June 30, 2017, 11:18:40 AM »
What part is restricting the power to the led, is it the resistors?
Yes, the current passing thru the resistor develops a 'voltage-drop' that subtracts from the total voltage applied. Example, with a 5Vdc source voltage and a 3.2Vdc LED @ 20mA, you'd want a 90Ω resistor to "drop" 1.8Vdc from the 5Vdc, thus leaving 3.2Vdc at the LED:

Resistor(Ω) = [V(source) - V(LED)] / A(LED) = R(Ω)

R = (5.0Vdc - 3.2Vdc)/20mA = (1.8Vdc/0.02A) = 90Ω
« Last Edit: June 30, 2017, 11:27:37 AM by Old Tele man »
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Offline WeatherHost

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Re: Adding LED (or?) to shield fan help
« Reply #68 on: June 30, 2017, 11:19:22 AM »
For whatever it's worth, I can see Blue farther and better in daylight than anything else.  There are also special high brightness models available rather than the discrete ones most places have.  These are both designed for 12VDC, so no additional step down is required.

https://www.superbrightleds.com/moreinfo/led-wired-bolts/bolt-beam-10mm-led-light/56/#tab/Overview

https://www.superbrightleds.com/moreinfo/led-wired-bolts/bolt-beam-12mm-led-light/1494/

Follow the links/tabs for special power supplies too.





 

« Last Edit: June 30, 2017, 11:21:27 AM by WeatherHost »
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Offline dupreezd

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Re: Adding LED (or?) to shield fan help
« Reply #69 on: June 30, 2017, 11:26:48 AM »
Yes, it is the resistors.
I looked at a couple of fan specifications and it seems most tach outputs can sink at least 200ma. Common type leds can sink 20ma which will be your limiting factor. Putting two 1k resistors in parallel will give you 500ohm resulting in 20ma to flow through the leds. They will be very bright.  :-)

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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #70 on: June 30, 2017, 11:39:16 AM »
What part is restricting the power to the led, is it the resistors?
Yes, the current passing thru the resistor develops a 'voltage-drop' that subtracts from the total voltage applied. Example, with a 5Vdc source voltage and a 3.2Vdc LED @ 20mA, you'd want a 90Ω resistor to "drop" 1.8Vdc from the 5Vdc, leaving 3.2Vdc at the LED:

R = (5.0Vdc - 3.2Vdc)/20mA = (1.8Vdc/0.02A) = 90Ω

I think they are getting around the 2v mark, cant remember the exact amount now
My PSU is a PC one so i think they can do 5v and 12v?

I know the blue can handle 6v but i dont know for how long,

Thanks for the sum(s) i will order some 90Ω now

Is this pack any good to me?



For whatever it's worth, I can see Blue farther and better in daylight than anything else.  There are also special high brightness models available rather than the discrete ones most places have.  These are both designed for 12VDC, so no additional step down is required.

https://www.superbrightleds.com/moreinfo/led-wired-bolts/bolt-beam-10mm-led-light/56/#tab/Overview

https://www.superbrightleds.com/moreinfo/led-wired-bolts/bolt-beam-12mm-led-light/1494/

Follow the links/tabs for special power supplies too.

The ones i have would be adequate if they get enough power


Yes, it is the resistors.
I looked at a couple of fan specifications and it seems most tach outputs can sink at least 200ma. Common type leds can sink 20ma which will be your limiting factor. Putting two 1k resistors in parallel will give you 500ohm resulting in 20ma to flow through the leds. They will be very bright.  :-)


Isnt that what i have just done, im sure the ones i got are 1k
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Offline Old Tele man

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Re: Adding LED (or?) to shield fan help
« Reply #71 on: June 30, 2017, 12:10:12 PM »
What source voltage do you intend to use, 5Vdc or 12Vdc?

It makes a difference in what value resistor that you need, as does the LED type/color that you use which establishes the values V(LED) @ A(LED) in the equation above.

I ask this question because 20mA thru 1KΩ produces a 20Vdc 'drop' which would be more in line with a 24Vdc source voltage than with either 5Vdc or 12Vdc.
« Last Edit: June 30, 2017, 12:34:28 PM by Old Tele man »
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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #72 on: June 30, 2017, 12:15:51 PM »
Hi, I have a choice in both, I think 12v would be better though, more airflow.

At the minute i have a fan wired up to 6v, it has 4 leads built in, these are drawing so much power that you can get away with removing the resistors and 1 led, at present, there is just enough power to run the fan, if I stop the fan, it cannot start again on its own lol but
That single led that left on the board is flashing, I i stop the fan, the led either goes out or stays on, but it's no longer flashing and its bright enough to dazzle you  I will do a quick video to show what I mean, I feel i can remove one or two of the leads off the fan ad that would give the fan more power..... I'm gonna end up killin me self lol
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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #73 on: June 30, 2017, 12:26:13 PM »
Here's the other video....
https://youtu.be/K0zmy9yBVCY
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Offline Bashy

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Re: Adding LED (or?) to shield fan help
« Reply #74 on: July 02, 2017, 06:56:04 AM »
Just treated my self to a decent psu for beach testing
http://mobile.radioworld.co.uk/Second_Hand_Manson_EP-603_PSU
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