Hello everyone,I am new to electronics and i got a project recently.I want to use a 70A Esc with SBEC 5.5V/5A to power my arduino uno.I noticed that there maybe a risk for me to insert the 5.5V BEC plug directly to the 5V Input as it exceeds5V.But it is also not recommended to insert BEC to Vin as it is below 6V which may lead to insufficient power supply to my arduino uno.So,what should i do if i want to power my arduino uno with SBEC which is power supplied by a 3000mAh 6S lipo? 
Thanks for helping!
I would think something like this would work. <$4
vinceherman:
I would think something like this would work. <$4
https://hobbyking.com/en_us/kingkong-5v-3a-ubec.html
But i need a 70A sc for my motor,any other recommendation?
Keep your ESC. Use it to power your motor since it is the right tool for the job.
But your ESC does not look like the right tool to power the arduino.
What you need to power the arduino is a regulated 5v power source that can take 6s input.
You know, like the one I linked to. 
For further clarification, you would not want to connect the red power wire from the ESC throttle servo plug to the arduino.
You would want to connect the ground from the throttle servo plug to the ground on the arduino.
You would want to connect the signal from the throttle servo plug to the pin you do the servo.attach in your code.
vinceherman:
Keep your ESC. Use it to power your motor since it is the right tool for the job.
But your ESC does not look like the right tool to power the arduino.
What you need to power the arduino is a regulated 5v power source that can take 6s input.
You know, like the one I linked to.For further clarification, you would not want to connect the red power wire from the ESC throttle servo plug to the arduino.
You would want to connect the ground from the throttle servo plug to the ground on the arduino.
You would want to connect the signal from the throttle servo plug to the pin you do the servo.attach in your code.
Alright,so if i dont get wrong,for the motor ,i would use my 70a ESC to power it and only connect the signal and ground to arduino and no red wire to arduino.For the arduino,i would use the esc you recommended to give a 5v power supply,and plug it to 5V input directly and of cuz the ground to the ground of the arduino,am i right?
vinceherman:
Keep your ESC. Use it to power your motor since it is the right tool for the job.
But your ESC does not look like the right tool to power the arduino.
What you need to power the arduino is a regulated 5v power source that can take 6s input.
You know, like the one I linked to.For further clarification, you would not want to connect the red power wire from the ESC throttle servo plug to the arduino.
You would want to connect the ground from the throttle servo plug to the ground on the arduino.
You would want to connect the signal from the throttle servo plug to the pin you do the servo.attach in your code.
or should i cut the head off from som old usb wire connect it to 5v output from bec and plug it to usb port for further protection?thanks!
You could put a 1 amp diode like 1N4003 in series with the 5V pin, cathode (end with stripe) toward 5V pin, that would drop 0.6 volts.
5.5V------->|-----5V pin (4.9V).
edgemoron:
You could put a 1 amp diode like 1N4003 in series with the 5V pin, cathode (end with stripe) toward 5V pin, that would drop 0.6 volts.
5.5V------->|-----5V pin (4.9V).
I got it,but will it be a better idea for me to convert 5v output to usb and plug it to 5v usb port,since i need to use my 5v pin to be a output to power the led strip?Thank you!
marvinsiu55:
since i need to use my 5v pin to be a output to power the led strip?
I did not know that you had more hardware.
It would be nice to have technical information about this LED strip.
Do you have a link to it?
Specifically, how much current will it draw? (hint, the arduino 5v pin should not be used to power any large current device)
vinceherman:
I did not know that you had more hardware.
It would be nice to have technical information about this LED strip.
Do you have a link to it?
Specifically, how much current will it draw? (hint, the arduino 5v pin should not be used to power any large current device)
It is a WS2812B LED strip 60leds/m ,approximatly half metre,around 9W.Should i use 5v/3A BEC to power this as well?And only use arduinno to send the lighting signal?Thanks a lot !