As I asked in the title How long does 2 sg90 servo motors work with 9v batteries?
Long enough for Duracell to make a fat profit.
Not long.
like how much minute
It might be as long as a minute, yes, if you're lucky.
How much amper does the SG90 use? And if I use 4 AA batteries, will this time change?
Minutes.
4xAA is 6V, not 9V. Try 6xAA for 9V.
9V battery discharge curve vs load current:
Do the experiment and let us know. I'll guess 2-3 minutes, with a fresh battery.
That is, if the servos move at all.
I would imagine your limited runtime would be eroded further if the servos were having to move often and if they were encountering any mechanical resistance from whatever it was that they were connected to.
9V batteries are probably only of use in smoke alarms, old TV remotes, some digital multimeters, and paper weights.
In reality the forum can only guess what the battery life would be. The current taken by the servos depends to a great extent on the load on the servo arm, which no-one knows.
More load = more current = less battery life.
9V is probably too much for SG90 (4.8V-6V). 4 or 5 AA rechargeable NiMH 2500mAh batteries should be more appropriate and should last from 3 hours up to say 3 days depending on the Work the 2 servos have to provide. Plus (or minus) supplying power to the Arduino itself...
Addicore will provide you with lots of useful information about energy consumption :
4.8V 6.0V
| Stall Current | 700 mA | 800 mA |
|---|---|---|
| Idle Current | 5 mA | 6 mA |
| No Load Running Current | 100 mA | 120 mA |
| Operating Voltage Range | 4.8V to 6V |
The voltage range for the SG90 is 4.8V to 6V.
Won't 9V damage the internal electronics and/or motor?
Regarding the data supplied by @ Etienne_74 The capacity of the PP3 is 1/10 of one mAh. That looks like 1/1000 of an hour, 1/1000 of 3600 seconds.... 3.6 seconds.......
So the current consumption could be anywhere between 5mA and 700mA, about right I guess.
So pointless even trying to estimate battery life unless you have details about the application, or shock horror of a suggestion, the OP actually measures the current consumption.
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Really?
That's more like a watch battery.
Less, in fact.
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