Hi
Got to the point where I've connected a Micro Servo and a Bluetooth module to the Arduino but both modules need a 5v supply. I can let the Servo have the 5v power from the board but I'm puzzled as to where the other 5v for the Bluetooth will come from.
Do they make USB connections that you can plug a jumper lead into the other end as this would solve my problems as I'm using a battery bank to run the Arduino from anyway?
There's plenty of power in the battery bank as I will only be running it for half an hour at the most.
Show details of the bluetooth module.
As for the servo, it cannot run from the Arduino 5v, you will need to power it direct from battery supply between 4.8v and 6v and run the signal wire to Arduino plus a common ground connection.
The Arduino is not intended to ‘power’ other ‘devices’. Ever.
By good fortune, you can provide power to bias sensors or inputs, but the current available isn’t enough to power anything else unless you know what you’re doing.
the consequences of pulling more than a very modest load from the Arduino regulator or 5v/3v3 pins are varied and unpredictable.
Just in case you are using something seriously abnormal, you need to be more clear about the modules you are using but, for Bluetooth at least, it is 110% normal, kosher, allowed , and even recommended by experts, to run the module from Arduino's 5v pin, and I have never heard of anybody doing anything else. You can even get a shield for Uno/Mega that really precludes you from powering Bluetooth by any way other than off the 5v pin
The servos are another matter altogether, and need to be powered by other means. Plan this properly, and you are likely to run Arduino off the power supply for the servos. In that event, you are still likely to run Bluetooth off Arduino's 5v pin.
I hope the picture will clear up any misunderstanding and help to explain what I'm trying to do. I've got a GoPro 8 with a remote control which I will sit on top of the Micro Servo (on a small circular plinth) and I'll control this via a Bluetooth App on my tablet or phone, whichever I have to hand at the time.
The Battery bank on the left will power the Arduino by itself and the battery bank on the right will power both the Bluetooth and the Servo. I'm sure these banks when fully charged will run this setup for 60 minutes each day. Which is ample time to video undercover. All this will fit nicely into a roll of wallpaper that sits in my backpack.
The only problem is the power lead coming out of the right-hand power pack. I'd like it to be a USB connection with a female connector at the other end that I can plug the 2 5v jumper leads into.
I've been searching for such a lead, but as yet haven't found on. Does anyone know what I'm talking about?
I would power the Bluetooth module from the Uno 5V (from one battery pack) and the servo, by itself, from the other battery pack. That will keep motor noise off of the Uno 5V.
I think the answer to that, is that you get a cheap USB cable from somewhere, and cut it to split out the red (positive) and black (negative) wires to connect your 5 V to your system.
Note that you do not want to use a thin cable. Some USB adapter cables are specified as "charge-only" cables, having only the red and black wires and should logically be particularly suitable.
You (unfortunately) have a UNO there - apparently a genuine UNO. As long as you are not connecting it to a PC via USB, the correct (and more sturdy) way to power it with your 5 V is via the "5V" pin and ground.
