Author Topic: Adding 3 servos to $50 robot board  (Read 552 times)

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Offline arrrrgonTopic starter

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Adding 3 servos to $50 robot board
« on: March 30, 2011, 11:52:17 AM »
If I wanted to add 3 more servo spots to the $50 robot board would I just need to add in 3 more 3 pin connectors, with each one going to one of the open ATMega pins and then connect them to the ground and 5v power bridges?

Offline hopslink

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Re: Adding 3 servos to $50 robot board
« Reply #1 on: March 30, 2011, 11:59:17 AM »
Yes you would add extra headers in exactly the same way as the existing ones, as you describe. If you are running 5 servos then they probably want a power bus that is separate from the +5V supply for the micro.

Offline arrrrgonTopic starter

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Re: Adding 3 servos to $50 robot board
« Reply #2 on: March 30, 2011, 01:55:44 PM »
Thanks again hopslink.  That was a typo on my part, I meant the unregulated power bus.  I'm just curious, can the $50 board control 12v motors, or will a 12v battery fry the board?  I'm a bit weak on the electronics side still, but if I'm right, the 12v should just go though the unregulated bus to the motor driver and to the motor, and the 5v regulator should still protect the microcontroller.

Offline Conscripted

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Re: Adding 3 servos to $50 robot board
« Reply #3 on: March 30, 2011, 02:34:44 PM »
if I'm right, the 12v should just go though the unregulated bus to the motor driver and to the motor, and the 5v regulator should still protect the microcontroller.

That's correct. You would need to be very careful that you didn't accidently plug something in that might be damaged by 12VDC.

Offline rbtying

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Re: Adding 3 servos to $50 robot board
« Reply #4 on: March 30, 2011, 03:59:46 PM »
You should probably be aware that RC Servos will probably burn out at 12V: the max voltage in-spec is 6.0v, and out-of-spec usually is limited to 7.2v.  Make sure you get a separate (preferably switching) regulator for the servo power bus - if you've got a motor drive board and motors as well, you may want to only run +12v to that board (the others likely can't handle it).

 


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