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Old Apr 05, 2003, 10:20 AM
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robw's Avatar
Detroit, Michigan
Joined Nov 2002
133 Posts
Question about Imeins tail LED setup

I have a question for Imeins, or anyone who has done his tail LED. I did it on my piccolo, and it workes great. I dont know to much about electronics, but was wondering how the slight increase in current draw from the LED would affect the Piccoboard gyro, because I had to reduce the gain after I soldered it on. just wondering if it could affect the gyro in a negitive way. although I dont seem to have a problem after I readjusted it.
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Old Apr 05, 2003, 05:52 PM
"Simplify, then add lightness"
Raleigh,NC
Joined Nov 2000
2,701 Posts
Rob,
What LED did you use for the tail? I looked at Ingmar's circuit, and he doesn't show a series resistor on the tail LED, because he used a flashing LED with built in electronics. If you used a standard LED, without a built in resistor or electronics, it will probably draw too much current, and limit the voltage to the tail motor.

Jeff
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Old Apr 05, 2003, 08:32 PM
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Detroit, Michigan
Joined Nov 2002
133 Posts
I used a flashing Led, but It is only rated at 3volts, I dont know how much current/voltage goes to the tailmotor, but I did use a 100ohm resistor to bring it down to a level safe for the Led.
It's just my Piccoboard seems to be acting funny after I did this. I can't understand how it would screw anything up, it could be coincidence or just my imagination though I removed the Led, and its still acting weird.
here is a pic:

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Old Apr 05, 2003, 10:21 PM
"Simplify, then add lightness"
Raleigh,NC
Joined Nov 2000
2,701 Posts
Rob,
The way you wired it looks just fine, and I don't see any reason it should affect the gyro. Maybe your tail motor is starting to go. All the reports are that they don't last very long.

Jeff
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Old Apr 06, 2003, 10:25 AM
Stupid gravity!
docphi's Avatar
Trinity, FL
Joined Jul 1999
1,516 Posts
Here's how I did mine...

http://www.rcgroups.com/forums/showt...&threadid=9078
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Old Apr 06, 2003, 09:03 PM
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imeins's Avatar
Australia
Joined Nov 2002
748 Posts
Hi.. The LED I used is designed to operate from 3-10v without the need for a series resistor. Since the LED may receive up to 9 volts or so you could happily try values from about 680ohms and down and still get a reasonable amount of light out of it. Obviously the higher the value the lower the current and possible effect on anything else. With a 680R at 9 volts you limit the current to 13mA, (not taking into account the LED voltage drop). At 100R of course you end up with up to 90mA!!

Ingmar
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Old Apr 07, 2003, 11:05 AM
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Detroit, Michigan
Joined Nov 2002
133 Posts
Hmm, I could not find an Led like the one you have, mine is rated 2.5-5 volts. I did change the resistor to a 220ohm, and it didn't affect the brightness, but anything more than that and it gets very dim.
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