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how do i choose suitable power for this project?

PostPosted: Thu Dec 06, 2012 12:56 pm
by j6433
currently i am trying to build a robot comprising of
2 SPG30 60K dc geared motor with encoder which requires 12V, 410mA X2
SPG10-398k which requires 6v
arduino mega 2560
servo C40R which requires 6v maximum
IR sensors requiring 5V

now im confused how to arrange or plan my power source for all this... i have 4x 18650 battery...
and for each voltage regulator there is a limit of 1A, so i cant regulate the voltage in series(12v, and then regulate again with 6V, and then regulate again with 5V, all in series) because all the currents add up will exceed the 1A limit at the first 12V regulator righ?

does it means that i have to connect 4x 18650 in series, supplying power, then regulate it with 12V voltage regulator,
and then buy another 2x 18650, and then regulate the power to 6V, and next regulate it to 5V in series? so that i can power up arduino, servo, and IR sensors? :(

or i have to spend again to buy 12V LiPo battery to only use for the spg30e-60k? :(

Re: how do i choose suitable power for this project?

PostPosted: Sat Dec 08, 2012 1:51 am
by zhenning
To increase the current capacity, you can try adding the same regulators in parallel so that the currents are shared equally by the regulators.

connecting-7812s-in-parallel.gif
connecting-7812s-in-parallel.gif (4.34 KiB) Viewed 2326 times

Re: how do i choose suitable power for this project?

PostPosted: Sun Dec 09, 2012 1:05 am
by j6433
thanksss really helpful picture :D

Re: how do i choose suitable power for this project?

PostPosted: Thu Dec 13, 2012 11:36 pm
by royalstorm7
wow .. wadda complicated hardware for a simple problem ... i suggest u to use a single transistor as regulator that driven by voltage regulator ic ...far simple ... but it good to try more than 1 option ...

royalstorm7@yahoo.com