Hi
My question concerns the remark about connecting a motor to two ports at once. I am asuming this counts for servos also?
I am using a SPG800A power servo from servocity. This servo pulls 700mA on "no load" with 4.5 or 6V according to the Hitec spec sheet.
Am I supposed to connect the two servo ports in parallel to the servo? Do I also have to "activate" the other servo via Arduino code (servo2.attach(10))so that current flows?
And am I right to guess that the USB port will not suffice in current thus needing a stronger external 6V transformer?
-Eddi
Switzerland
servo current
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- Franklin97355
- Posts: 23910
- Joined: Mon Apr 21, 2008 2:33 pm
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- Posts: 8
- Joined: Mon May 05, 2008 5:50 pm
Can you perhaps quickly check if I did it right?
I connected the 5V Pin (red wire) from Arduino to the "+" Pin of the servo
[img=http://img440.imageshack.us/img440/6929/img2026iu0.th.jpg]
[img=http://img185.imageshack.us/img185/7230/img2024iw1.th.jpg]
I connected the 5V Pin (red wire) from Arduino to the "+" Pin of the servo
[img=http://img440.imageshack.us/img440/6929/img2026iu0.th.jpg]
[img=http://img185.imageshack.us/img185/7230/img2024iw1.th.jpg]
- volt dropper
- Posts: 30
- Joined: Thu Apr 24, 2008 12:58 am
OP That servo should have come with a splitter. The splitter is used to allow for external power for the servo...
In other words, On a typical RC plane the servos draw current thru the radio. (Like you're trying to do with the Arduino) But when you get to the big guys you'll fry your radio. (or Arduino)
So the splitter goes like this....
External 6V source -----\
Battery --- Radio --------*==== servo
The power pin only goes to the external source. So one battery operates the radio and small servos and the big servo has its own source. (but gets the signal from the radio)
DO NOT try to draw that much power thru your Arduino. That servo is a monster.
If you lost/threw away the splitter, Servo City has replacements.
(BTW have that same servo on the front of my kids ride in train.... (regular servo not the gearbox) it's been very durable if a bit noisy.)
In other words, On a typical RC plane the servos draw current thru the radio. (Like you're trying to do with the Arduino) But when you get to the big guys you'll fry your radio. (or Arduino)
So the splitter goes like this....
External 6V source -----\
Battery --- Radio --------*==== servo
The power pin only goes to the external source. So one battery operates the radio and small servos and the big servo has its own source. (but gets the signal from the radio)
DO NOT try to draw that much power thru your Arduino. That servo is a monster.
If you lost/threw away the splitter, Servo City has replacements.
(BTW have that same servo on the front of my kids ride in train.... (regular servo not the gearbox) it's been very durable if a bit noisy.)
- volt dropper
- Posts: 30
- Joined: Thu Apr 24, 2008 12:58 am
Hey, glad it helped.Selaseth wrote:Hey thanks, I was wondering what that cable (splitter) was for. I'll try that out!
Yes, I was worried, it would fry my arduino as the servocity guy said i would at least need 3 amps
BTW I don't know what you're using it for, but my local Academy Sports has 6V SLA batteries cheap. With looooong Ah ratings. If you're pulling that much current, I'd look at that over NiHM packs. (assuming you have the space and can handle the weight etc)
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- Posts: 8
- Joined: Mon May 05, 2008 5:50 pm
I'm using it for a sound installation to wind up cable to open a lever to let sand out of a 3m hourglass..lots of force required.
Btw, my splitter is such that it looks more like its for attaching two servos on one port instead of being able to attach an external power source.. What I'll do as soon as i get my 6V / 20ams transformator is to attach it directly to the servo via the +/- pins and attach the signal cable to the signal pin on the arduino.
Btw, my splitter is such that it looks more like its for attaching two servos on one port instead of being able to attach an external power source.. What I'll do as soon as i get my 6V / 20ams transformator is to attach it directly to the servo via the +/- pins and attach the signal cable to the signal pin on the arduino.
Please be positive and constructive with your questions and comments.