Should I insert my ESC to 5v or VIN-pin to power my Arduino?

Hi guys!

I am currently building my first real arduino-project and it includes a 120A Brushless Esc, 270kv brushless motor, 3s lipo battery, arduino uno and a hc-05 bluetooth module.

The 3s lipo battery is connected with the esc that is connected to the motor. From the esc i am connecting two jumper cables that goes to GND and pin 9. Right now I do not have a cable from the centre wire of the ESC (red wire) and now I am wondering were I should insert this on the arduino so that the battery can also power up the arduino.

I will post a link of how it currently looks:

It is basically this:


but with an Arduino Uno instead.

This is the ESC that I bought:
https://www.alibaba.com/product-detail/RC-car-brushless-ESC-120A-splash_60440374394.html

Is the BEC-Output spec what i should look for? if so it says 6V3A.

Does this mean that I should insert the middle wire of the GND (red) to the VIN-pin because it is above 5V? Or should I insert it on the 5V?

I do not have a multimeter at home so if I could solve it without one that would be terrific. I will get one soon enough either way but it takes a few days for delivery and I am very eager to get this project done right away!

Appreciate all the help :slight_smile:

Carlitosss:
Is the BEC-Output spec what i should look for? if so it says 6V3A.

Does this mean that I should insert the middle wire of the GND (red) to the VIN-pin because it is above 5V? Or should I insert it on the 5V?

I do not have a multimeter at home so if I could solve it without one that would be terrific

A multimeter is an essential tool and they are not very expensive.

Under NO circumstances should you connect anything to the 5v pin that might exceed 5v even for a microsecond.

I think 6.3v is too low for feeding to the Vin pin. The recommended minimum for the Uno is 7v.

If this was my project I would consider using an LM317 voltage regulator to drop the 6.3v to 5v or maybe 4.5v and then feed it to the 5v pin.

...R

Robin2:
A multimeter is an essential tool and they are not very expensive.

Under NO circumstances should you connect anything to the 5v pin that might exceed 5v even for a microsecond.

I think 6.3v is too low for feeding to the Vin pin. The recommended minimum for the Uno is 7v.

If this was my project I would consider using an LM317 voltage regulator to drop the 6.3v to 5v or maybe 4.5v and then feed it to the 5v pin.

...R

Ok! Yeah I will order one today for sure. It will come to the door in a few days hopefully. Should I wait for it or could it work to put it on the VIN-pin? Maybe it is dangerous.

Carlitosss:
Should I wait for it or could it work to put it on the VIN-pin?

I can only conclude that you did not read Reply #1 or you did not understand it. If the latter you need to explain what you don't understand if I am to clarify things.

...R

Robin2:
I can only conclude that you did not read Reply #1 or you did not understand it. If the latter you need to explain what you don’t understand if I am to clarify things.

…R

Yes i saw that too now. I read it to fast! Sorry. Let me rephrase my question. If 6.3V is to low for the Vin-pin, can it damage the board, motor, battery or the esc? Or can I try it without any harm being done?

I don't think 6.3v on Vin will cause any harm - the Arduino may just work irregularly.

...R

6.3V should be fine, Vin goes to the regulator input, and I think it only needs 1V above the output to work correctly.

Seems to work perfectly fine when I connect it to the VIN-pin! :slight_smile: Thanks a ton guys!!