# Which power source to use

Hello, I am currently building a project that will require the Arduino, attached to it is an MP6050 Gyroscope and Accelerometer. The project will also have these two motors

https://www.amazon.com/gp/product/B07569WJ1M/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

I'm not too familiar with the Arduino projects so would like to know, what is the optimal power supply to use for this project. As I understand there should be two different power supplies. So for the Arduino and the MPU 6050, will 6 regular AA batteries suffice?

While for the motors, will a separate set of 6 AA Batteries suffice?

As I understand the length of operation of these batteries is dependent on the current drawn. So for example in such batteries as this https://www.amazon.com/dp/B07DLX8BFD/ref=emc_b_5_t

Since the two motors have the Min Working Current as 1A, and the batteries are 1.6 A does it mean at most I'll get 1.6 hours from these batteries? (I understand that it will be more since they won't always be in the working current but still is the math correct?) Or does the time divide into two since there are two motors?

The motors are independent from each other but will quite often work at the same time.

If someone could help me with this or recommend a certain power supply, I will greatly appreciate it. Thank You :)

Yes, power the Arduino separately and connect the grounds.

You need to find out the stall torque of those servos. It is probably higher than 2 Amperes (this one, which is similar, has a stall torque of around 3A).

The servo briefly draws the stall torque every time it starts moving, so figure a 6V/4A power supply at minimum.

For purposes of battery life calculations, you need to measure the average current draw, which will depend strongly on the application and load. Battery capacity is measured in Ampere-hours, and battery lifetime in hours is roughly (battery capacity in Ah)/(average load current in A). But for safety, and to account for battery aging, divide that estimate by two.

jremington: Yes, power the Arduino separately and connect the grounds.

You need to find out the stall torque of those servos. It is probably higher than 2 Amperes (this one, which is similar, has a stall torque of around 3A).

The servo briefly draws the stall torque every time it starts moving, so figure a 6V/4A power supply at minimum.

For purposes of battery life calculations, you need to measure the average current draw, which will depend strongly on the application and load. Battery capacity is measured in Ampere-hours, and battery lifetime in hours is roughly (battery capacity in Ah)/(average load current in A). But for safety, and to account for battery aging, divide that estimate by two.

Thanks for such a quick reply!

Damb the Servos don't give me a proper data sheet to find the stall current. But for example so for Arduino I'd just use the 6 AA batteries together.

But what would be a good power source for 6V 4A?

I found this which is rechargeable which is good but the weight of the battery is too large. My project is very dependent on weight.