|Dec 09, 2013, 02:39 PM|
need some simple LED electronics help
for some time I have been trying to make a simple exhaust ring for my planes. LED ring is done. total of 18 3mm LED's with a 20mah and 3v power for each. The ring has 2 "rows" for the positive side and a shared ground. I have not yet put the LEDs on the ring so I can reverse this if needed.
So I would like to get a nice flicker and dimming with this ring linked to the throttle of my plane. If I can only get the dim or the flicker I am ok with that.
Here is what I have:
a few stripped servos I can rob the boards from
various simple ICs (555, 556, LM7805, LM317, etc) nothing programable
I DO NOT have any way to program IC's, I have no knowledge of how to program IC's. Please dont go that route unless you want to make the board for me with the ICs loaded on it
I do not have anything like Arduino. only old school type stuff.
Im not terribly concerned about power loss since I only fly for a minute or two at a time so its not a big deal for me.
Dose any one have any ideas for me? or sugest a ready made controller that may be used with my board?
I did forget to mention, I do have a SILabs flashing tool. Have yet to set it up for programing my ESC's for my quad. Is it posible to maybe reprogram an extra ESC to run LEDs at a much slower rate then a motor? I know most ESCs will shut down if it dosnt detect the motor some some fancy programming would be needed to get around this. I do have a number of extra small ESCs that I could use one of these for this task. going this way I can alternate the loading of the LEDs on the board to take advantage of the AC switching off the ESC to get my flikering, and the PWM of the ESC for the brightness. The extra ESC's I have are Turnigy PLUSH 10a.
|Yesterday, 05:26 AM|
In parallel the total current drain at 20mA per LED will be 360mA. Your BEC/rx battery should have no problem supplying this current. At 5V the current limiting resistors required would each have a value of 100 Ohms (2V/20mA).
You could control the ring using the circuit board out of a servo. The ring should be connected from one of the motor wires to the servo positive supply (choose the motor wire that causes the ring to light up at high throttle). Adjust the feedback pot so the LEDs start to light up at the desired throttle level. Once you have determined the required pot position, it can be replaced with two fixed resistors that have the same resistance.
However you may find that more current is required to get sufficient brightness. In this case it is better to string 2 or 3 LEDs in series, and power them from the main battery. 6 banks of 3 LED series strings would drop ~9V (suitable for operation from 3S lipo) and at 100mA per string would draw a total of 600mA.
For running off higher voltage you could use a brushed ESC (eg. Turnigy/Hobbywing Eagle 20A), reprogram a brushless ESC (using eg. Steven Martin's Brushless ESC to Brushed code) or make your own brushed controller. As you don't need an arming circuit or LVC, a simple analog controller will suffice.
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