Hi, I just want to be safe then sorry. So this may be a stupid question.
I have a nano. I want to use a 9.6V 1.25A battery to power it as well as some servos, according to the data sheet for nano, pin 30 can take 6-20 V So it seems 9.6V will be OK. But what my concern is the 1.25A current, will this current damage the nano? Do I need a 7805 to step down the voltage to 5V, would it step the current as well?
Pin 30? Is that Vin?
You are not taking 5V from the regulator to power the servo - that will smoke the regulator.
The onboard regulator should only power the Nano.
Connect all grounds together: Nano, power supply, servos.
If the servos need 5V, use a seperate regulator for them.
CrossRoads:
Pin 30? Is that Vin?
You are not taking 5V from the regulator to power the servo - that will smoke the regulator.
The onboard regulator should only power the Nano.
Connect all grounds together: Nano, power supply, servos.
If the servos need 5V, use a seperate regulator for them.
Hi CrossRoads , thank you for the quick reply.
Yeah, I was talking about the Vin - pin 30 as in the attached diagram. And no, I wasn't thinking of using the +5V pin 27
to power the servos. I was going to use a 7805 to step down the 9.6V as external power for the servos. That ought to be fine I hope.
That amperage rating is odd for a battery, does it say "Ah" since that would make more sense. It may help to think of electricity as a fluid, voltage is the fluid pressure and current/ampacity is how much fluid is flowing. 1.25 Ah means the battery will give 1.25 Amp for an hour, or 250mA for five hours. 1.25Ah battery may give 100 Amps (or more) if shorted, so a fuse is a good idea (does the nano have a fuse on Vin?).
ron_sutherland:
That amperage rating is odd for a battery, does it say "Ah" since that would make more sense. It may help to think of electricity as a fluid, voltage is the fluid pressure and current/ampacity is how much fluid is flowing. 1.25 Ah means the battery will give 1.25 Amp for an hour, or 250mA for five hours. 1.25Ah battery may give 100 Amps (or more) if shorted, so a fuse is a good idea (does the nano have a fuse on Vin?).
Actually it says 1250mA/hr. Anyway, come to think of it, putting the Nano and servos on the same power source is just a dumb idea. And I also tested out that, even with this battery after steeping down to 5V, it wasn't able to drive all servos, so I have to abandon this plan. Back to the drawing board.
There are no 5V batteries.
Batteries are rated in Ah (ampere-hours) or mAh (milliampere-hours).
I've had good luck with batteries from http://www.all-battery.com/
I took jremington's suggestion, found this Tenergy Power, I know it's a charger, but the size is perfect for my robot. It already has 5V and 13000mAh output, do you think it might do the job?