i will use 2 DC motors (4-6V 190-250mah) + 1 Servo 6v + arduino uno + motor driver sheld
wich battery suitable to use ( 6xAA or 1X9V ) what if i use Rechargeable battery how much ??V and ?? mha
thank you
volts = 6 but you will need a 5 volt LDO for the UNO.
What is unknown is AmpHours.
When all is connected to a 6 Volt power supply, what is the Amps measured?
What is the duty cycle of the system and how long will the system be in service before batteries will be replaced?
This is the questions only you can answer.
A 9-volt battery is very likely not suitable, as you will have to regulate to 6 and 5 volts, and they have a very few AmpHours.
Specified AmpHours are usually Max AmpHours that must be derated by actual Amps drawn. Reputable battery manufacturers will provide charts to derate AmpHours.
There is absolutely not enough information for anyone to credibly answer your questions.
- Re. the DC Motors: when you say 190-250mah, first, I'm assuming you mean mA, not mAh -- "mAh" is "milliamp hours" which is a parameter generally used to specify battery capacity. So, assuming you mean milliamps, then is that the unloaded current? The stall current? Or something in between?
- Re the 6V Servo...care to divulge a little more, like the brand and model #, or some relevant specifications?
- Re the motor driver sheld [sic]. Which motor driver shield? They're not all alike.
- Which battery to use? How long do you want it to run? Will it run continuously, or intermittently? On what schedule OR pattern? And, if you're talking a 9V battery system, how are you planning on supplying the 6V for the Servo [and perhaps that DC Motor]--or will the mystery motor driver handle this?
- On the question of whether to use a primary battery [i.e. the 6xAA or 1X9V], or a secondary battery system [i.e. the *Rechargeable battery*], is fully up to you. For us to even consider recommending anything, we would need to know more about your project--i.e. what are you trying to achieve?
So, please read: How to use this Forum, then get back to us.
Mr. Perehama ( thank you for your answer it is very usefle to me )
Mr. ReverseEMF (thank you for your concern)
i try to make a car with Bluetooth control
2 or 4 DC Motor 4-6 V (Max 250 mA)
1 Micro Servo Motor (1.3kg.cm) 4.2-6 V
1 DC Motor/Stepper/Servo Driver Shield for Arduino 4 H-Bridges: L293D chipset provides 0.6A per bridge (1.2A peak) with thermal shutdown protection, internal kickback protection diodes. Can run motors on 4.5VDC to 25VDC.
1 Bluetooth HC-06
1 Aurdino Uno
i am a beginner, so all i need to choose a right source of power to this system
Don't use a 9V block. It can provide hardly any current. A 9V block is almost never the right choice.
LotfyMansour:
Mr. ReverseEMF (thank you for your concern)i try to make a car with Bluetooth control
2 or 4 DC Motor 4-6 V (Max 250 mA)
No, that 250mA is much more likely to be the unloaded current, not the maximum. Motors take lots of
current under load.
Forget completely any thought of small 9V batteries powering motors, servos or anything that takes
high current.
And learn the difference between a hobby servo and a servo motor, you have a hobby servo(mechanism),
not a servo motor! Small hobby servos need 1A or so each, so you probably should be thinking a 2S LiPo
pack (7.4V). 2S means 2 in series, LiPo cells are 3.7V each, nominally. Servos only want 6V or so, so
something like a cheap LM2596 buck converter to drop the voltage to 5 or 6V is plausible.
4x high current rechargable AA's is another possibility, but bigger cells is more reasonable, C-cells perhaps.
With a 6V pack you can run everything, but note that the motors will be rather slow, the L293D drops
a lot of voltage (2V or thereabouts is lost).