"SMD5050 x6 on a PCB with built in 12v regulator. Can't beat the price either. I LOVE mine! They're insanely bright and not too bad on battery usage.
I run one at each corner or SMD5050 waterproof strips (they usually have black PCBs so…"
James's Discussions
LEDs (big, serious LEDs) brightness control
Started this discussion. Last reply by Dane yesterday. 14 Replies 0 Likes
having used LED strips, ive found theyre great in low light (or at night), but completely useless in bright sunlight.now that im getting parts together for a new custom frame, im going to try some…Continue
arducopter-fgmodel.zip and HIL setup
Started this discussion. Last reply by James May 29. 3 Replies 0 Likes
im setting up HIL simulation and have only got as far as: "Copy the arducopter model from arducopter-fgmodel.zip (included with planner)"does mission planner no longer contain this zip? i have…Continue
Yaw "rebound"
Started this discussion. Last reply by Randy May 23. 9 Replies 0 Likes
this is an issue ive had since my first flights with v2.1, and has stuck with me through versions 2.2, 2.3, and is exactly(?) the same now in v2.5on yawing, if i am very very careful to ease the…Continue
Heavy PID tuning (@Marco)
Started this discussion. Last reply by James Apr 15. 4 Replies 0 Likes
since installing AC 2.5 things are going frankly very well - im not affected by the magnetometer problems and i have been able to get a lot of really good flights in with only very minor problems. i…Continue
James's Page
Latest Activity
James replied to James's discussion LEDs (big, serious LEDs) brightness control"as long as i can distinguish between port and starboard thats fine :)"
Nick Arsov replied to James's discussion LEDs (big, serious LEDs) brightness control"Hi James,
Yes right - Vf=forward voltage across the LED, Vcc is your power voltage.
No problem to drive the LEDs with lower current than they could withstand. Thus you'll make them cooler and prolong their life, but the negative side is the…"
Chris replied to James's discussion LEDs (big, serious LEDs) brightness control"VERY simple..... Brushed motor speed control.
12V input. PWM output.
saw it on an issue of "flitetest" on youtube
http://www.youtube.com/watch?v=cdEHGw2UeYw&feature=plcp
"
James replied to James's discussion LEDs (big, serious LEDs) brightness control"Nick,
Vf is obviously Voltage forward, Vcc must be supply voltage, right?
another thing is that im finding a lot of the CREE type LEDs rated at currents much higher than the 50mA ones i was looking at originally - i suppose theres no problem…"
James replied to James's discussion LEDs (big, serious LEDs) brightness control"Slanderer,
what have you got against buckpuck? from what ive seen in the past couple of days they look pretty good. with brightness control by a simple potentiometer or from a 5v signal input, theyre in a nice compact package, and the price…"
Nick Arsov replied to James's discussion LEDs (big, serious LEDs) brightness control"Hi James,
Afew simple rules when driving LEDs:
1. DO NOT overcurrent the LEDs. Otherwise they will die.
2. When using resistor or current source, do use more leds in series to lower the voltage difference between the Vcc and the NxVf ( number of…"
TheSlanderer replied to James's discussion LEDs (big, serious LEDs) brightness control"You're right about those LEDs--they have resistors in series, and are wasting most of the energy. As such, using an external buck regulator isn't a good option--it will require >12 V in order to put 50mA through the LED +…"
DeveloperR_Lefebvre replied to James's discussion LEDs (big, serious LEDs) brightness control
"FWIW, I use these on my helicopter.
http://www.hobbyking.com/hobbyking/store/__16383__12_LED_Cluster_Green.html
or:
http://www.hobbyking.com/hobbyking/store/__16381__4LED_Strip_WHITE.html
They are very visible during the day when roughly pointed…"
James replied to James's discussion LEDs (big, serious LEDs) brightness control"Alexander,
youre right, 50mA is not 1W at 12V - i had also spotted this, but made my own comparison with the brightness of the little leds on the turnigy led strips:
the strips state 400 mA for one metre (pretty much the 5W you state), which with…"
James Court commented on James's blog post Futaba T7C - Six Flight Modes"This is brilliant!
Thank you very much for posting this.
Not only have I six flight-modes working - but i also have an insite to what the Transmitter is doing when switches are thrown."
Alexander replied to James's discussion LEDs (big, serious LEDs) brightness control"Are you sure that this bulb it much brighter than little piece of typical LED strip?
From ebay link i can see some mystical numbers is specs:
12V * 0.05A = 0.6W... And it's not 1W :)
Typical led strip have power 5W/1 meter.. I can decide that…"
James replied to James's discussion LEDs (big, serious LEDs) brightness control"thanks to you both,
it makes sense to drive the leds with a constant current, and now i see theres a whole range of products specifically for this!
the BuckPuck looks ideal and at a reasonable price, but now that i know about these things i…"
Knut Graf replied to James's discussion LEDs (big, serious LEDs) brightness control"Google around for diy bicycle light projects. There are a number of controllers that provide brightness adjustment for high-current LEDs. The BuckPuck (ledsupply.com) comes to mind.
Knut"
Nick Arsov replied to James's discussion LEDs (big, serious LEDs) brightness control"Hi James,
The best/right way to power leds is with stable CURRENT.....not voltage! The forward voltage drop across the led is a consequence of a flowing through current. So, all manufacturers give Vf as a function of forward current. For higher…"
James posted a discussionLEDs (big, serious LEDs) brightness control
having used LED strips, ive found theyre great in low light (or at night), but completely useless in bright sunlight.now that im getting parts together for a new custom frame, im going to try some seriously big LEDs giving a single point of light at the end of each arm. these are favourite so far: http://www.ebay.es/itm/130702285270 as they are rated for a 12V socket i assume they have a resistor in series with the LED inside that case, but i…See More
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James's Blog
Futaba T7C - Six Flight Modes
Posted on May 9, 2012 at 4:30pm 7 Comments 4 Likes
so, following my post here: http://www.diydrones.com/forum/topics/futaba-t7c-channel-5-mode-switch
and the tutorial here: …
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