# Lumen light will be off when the motor run **URL:** \ **Category:** Lights\ **Created:** [April 12, 2017, 2:49pm UTC](https://discuss.bluerobotics.com/t/lumen-light-will-be-off-when-the-motor-run/949 "2017-04-12T14:49:29Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![qdxiatao](https://avatars.discourse-cdn.com/v4/letter/q/f4b2a3/32.png) [@qdxiatao](https://discuss.bluerobotics.com/u/qdxiatao)\ **Post date:** [April 12, 2017, 2:49pm UTC](https://discuss.bluerobotics.com/t/lumen-light-will-be-off-when-the-motor-run/949/1 "2017-04-12T14:49:29Z")
I used Ardusub firmware v3.4 and connect light to rc9. when i changed the pwm value through joystick,the light will be brighter or dimmer normally. But when i operated the propellers, the light will be off. once i did not operate the propeller, the light will be on normally. I also connected the light to Arduino and set pwm value to 1700, when i operate the propeller, there is no effect. I think when i operate the propeller , the pwm value of rc9 will be affected. Thanks! ---
**Author:** ![jwalser](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/jwalser/32/2234_2.png) [@jwalser](https://discuss.bluerobotics.com/u/jwalser)\ **Post date:** [April 12, 2017, 3:31pm UTC](https://discuss.bluerobotics.com/t/lumen-light-will-be-off-when-the-motor-run/949/2 "2017-04-12T15:31:06Z")
Can you please take a picture of your electronics, and a picture of the back of the Pixhawk, where the motors and lights are plugged in? ---
**Author:** ![rjehangir](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/rjehangir/32/671_2.png) [@rjehangir](https://discuss.bluerobotics.com/u/rjehangir)\ **Post date:** [April 12, 2017, 6:32pm UTC](https://discuss.bluerobotics.com/t/lumen-light-will-be-off-when-the-motor-run/949/3 "2017-04-12T18:32:49Z")
Hi @qdxiatao, Can you also please tell us which frame version you are using? Did you download the firmware for vectored, bluerov, vectored-6dof? -Rusty ---
**Author:** ![qdxiatao](https://avatars.discourse-cdn.com/v4/letter/q/f4b2a3/32.png) [@qdxiatao](https://discuss.bluerobotics.com/u/qdxiatao)\ **Post date:** [April 12, 2017, 9:48pm UTC](https://discuss.bluerobotics.com/t/lumen-light-will-be-off-when-the-motor-run/949/4 "2017-04-12T21:48:44Z")
i use PX4-vectored v3.4 downloaded from [firmware.ardusubu.com](http://firmware.ardusubu.com). motor 1-6 are connected to channel 1-6. camera servo is connected to channel 8 light is connected to channel 9 ---
**Author:** ![rjehangir](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/rjehangir/32/671_2.png) [@rjehangir](https://discuss.bluerobotics.com/u/rjehangir)\ **Post date:** [April 12, 2017, 10:04pm UTC](https://discuss.bluerobotics.com/t/lumen-light-will-be-off-when-the-motor-run/949/5 "2017-04-12T22:04:20Z")
@qdxiatao - Okay. Can you send a screenshot of the lights setup page in QGC? I’d like to make sure they’re configured for the right channel. ---
**Author:** ![qdxiatao](https://avatars.discourse-cdn.com/v4/letter/q/f4b2a3/32.png) [@qdxiatao](https://discuss.bluerobotics.com/u/qdxiatao)\ **Post date:** [April 12, 2017, 11:18pm UTC](https://discuss.bluerobotics.com/t/lumen-light-will-be-off-when-the-motor-run/949/6 "2017-04-12T23:18:32Z")
![](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/2X/b/b3a106bfabadcf14cf5d190d0a1973c9c9040b6a.jpg) ![](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/2X/a/a71b570174dab8645a20c0ff5bb6edecdd3db697.png) ![](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/2X/c/c8c006a4dc8113d1c0e6febdc0ee14d51c7a961f.jpg) ---
**Author:** ![qdxiatao](https://avatars.discourse-cdn.com/v4/letter/q/f4b2a3/32.png) [@qdxiatao](https://discuss.bluerobotics.com/u/qdxiatao)\ **Post date:** [April 13, 2017, 1:07am UTC](https://discuss.bluerobotics.com/t/lumen-light-will-be-off-when-the-motor-run/949/7 "2017-04-13T01:07:48Z")
# If i use arduino to receive pwm value from pixhawk and then control led, it is normal. the pwm value output from aruidno is normal when i operate propeller. pixhawk is powered by ESC very strange！ #include \ int buttonPin = 13; //read pixhawk pwm value from ch9 byte servoPin = 9; Servo servo; void setup() { servo.attach(servoPin); Serial.begin(9600); servo.writeMicroseconds(1100); // send “off” signal to Lumen light } void loop() { int pwmValue = pulseIn(buttonPin, HIGH); servo.writeMicroseconds(pwmValue); Serial.println(pwmValue); } ---
**Author:** ![jwalser](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/jwalser/32/2234_2.png) [@jwalser](https://discuss.bluerobotics.com/u/jwalser)\ **Post date:** [April 13, 2017, 1:53am UTC](https://discuss.bluerobotics.com/t/lumen-light-will-be-off-when-the-motor-run/949/8 "2017-04-13T01:53:24Z")
I have just confirmed with an oscilloscope that servo Pin 9 is operating as it should in this configuration on ArduSub 3.4, whether or not the motors are armed. How are you powering the light? Are you sure that that green wire is spliced well? Why aren’t you using Main servo output 7? If you use that pin, you can see the pwm value on the pin under SERVO\_OUTPUT\_RAW in the mavlink inspector. Another note is that we recommend using QGC 3.1 with ArduSub 3.4, you might want to try that. -Jacob ---
**Author:** ![jwalser](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/jwalser/32/2234_2.png) [@jwalser](https://discuss.bluerobotics.com/u/jwalser)\ **Post date:** [April 13, 2017, 1:58am UTC](https://discuss.bluerobotics.com/t/lumen-light-will-be-off-when-the-motor-run/949/9 "2017-04-13T01:58:05Z")
If you are still having the problem, please save your parameters by clicking the ‘Tools’ menu in the parameters tab of QGC, and send them here. ---
**Author:** ![rjehangir](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/rjehangir/32/671_2.png) [@rjehangir](https://discuss.bluerobotics.com/u/rjehangir)\ **Post date:** [April 13, 2017, 3:47pm UTC](https://discuss.bluerobotics.com/t/lumen-light-will-be-off-when-the-motor-run/949/10 "2017-04-13T15:47:05Z")
Hi @qdxiatao, How are you powering the system right now? If you are using a low voltage battery or a low-current power supply, it’s possible that the voltage is dropping below the usable point for the lights, which is about 8v.