[anthropo]

Hello,

If you cut a trace and run a couple of wires the tail light can even be made to flash the revo flight mode, arming status, etc.   It's actually a ws2811 led strip.

Can you tell me more about this trace please ?

Thank you

[hwh]

The connections are labeled on the led circuit board, vcc, gnd, dat.  That dat one is the one you connect to in the wiki LED instructions at https://librepilot.atlassian.net/wiki/display/LPDOC/Setup+WS281x+Led

As shipped from the factory the led dat is connected to the pdb stm8 processor so the lights can be controlled using a spare accessory channel.   If you cut the trace to dat and jumper it to one of the outputs shown in the wiki above it'll blink the status instead of being a solid color.

Remember, this only works if you've upgraded the racer 250 to a revo.  The firmware for the stock CC3d board doesn't support leds.

[zukenj]

The connections are labeled on the led circuit board, vcc, gnd, dat.  That dat one is the one you connect to in the wiki LED instructions at https://librepilot.atlassian.net/wiki/display/LPDOC/Setup+WS281x+Led

As shipped from the factory the led dat is connected to the pdb stm8 processor so the lights can be controlled using a spare accessory channel.   If you cut the trace to dat and jumper it to one of the outputs shown in the wiki above it'll blink the status instead of being a solid color.

Remember, this only works if you've upgraded the racer 250 to a revo.  The firmware for the stock CC3d board doesn't support leds.

hwh,

Can you post the link to the vendor for that LED Strip

[hwh]

It's probably made by eachine, they're available on BG as spare parts. http://www.banggood.com/Eachine-Racer-250-Drone-Spare-Part-Tail-LED-Light-Bar-Red-Light-p-1017958.html

[anthropo]

Thank you

[anthropo]

Sorry but i certainly misunderstood.
I have unsoldered DAT from the main board to the tail led strip. Connected it to the flexi-io pin 3, activated led_strip in settings. But i have nearly the same behavior : When i put power on the racer, led strip just takes a new color, and keeps it till i re-power. More, only half lights.
What did i miss ?

[hwh]

I'd try using one of the extra servo out ports like 5 or 6.  If it's a full size revo the connector pins should be easier to connect to than the flexi-io port.   And if it's a "cc3d-mini-revo" the flexi-io port doesn't have pins 3 and 4 on it so the servo outs are the only choice.

I put the stock cc3d that doesn't support LEDs back on my Racer 250 so I can't run any tests.

edit: another thought, did you put tape or something under the unsoldered tab to make sure it's not touching the main board?