18 servo controller - Page 5 - Electronic Circuits Projects Diagrams Free

**Nigel Goodwin** · 7th December 2007, 10:12 AM

Quote:

Originally Posted by Ambient

I mean 5V on the servo input signal from the PIC, with 6V to the servo power.

Yes I know, it will be fine!.

Ambient · 7th December 2007, 03:32 PM

Thanks Nigel. Looks like I have quite a few options then. I may just use a 5 cell NiMH 3300 GP pack, but was hoping to use a single large LiPo. But I can't seem to find an inexpensive DC-DC boost converter that would supply enough current. I figure with 6 legs at 3 servos each, there should be around 9 servos running at once. Stall current for these servos is 1.2-1.5A, + 3A for PIC, misc. So that comes out to around 16.5A @ 5V (or 6Vif I can find one). I will keep looking. For now I should probably just use a 5-cell and a modular design so I can change the PS later.

Ambient · 7th December 2007, 03:55 PM

maybe I could use one of these things for object avoidance? It would be pretty interesting, but I don't know if a proximity detector will work properly in close proximity to 18 servos, since they have motors and are changing their position. Maybe put two detectors on shielded antennae?
http://www.newark.com/jsp/Semiconduc...sp?sku=81K2770

yanny_boy · 6th June 2008, 03:04 PM

Hi,

I know this has 2 different servo controllers in one thread... but I am trying to make a servo controller using an 18f4550 and this first 2 pages seem exactly what I want, is there a recommended schematic/pcb as I am new to pics and am not sure what resistors and capacitors I need where to make the clock and usart happy....

any help would be great.

thanks.

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7th December 2007, 03:32 PM	(permalink)
Ambient	Thanks Nigel. Looks like I have quite a few options then. I may just use a 5 cell NiMH 3300 GP pack, but was hoping to use a single large LiPo. But I can't seem to find an inexpensive DC-DC boost converter that would supply enough current. I figure with 6 legs at 3 servos each, there should be around 9 servos running at once. Stall current for these servos is 1.2-1.5A, + 3A for PIC, misc. So that comes out to around 16.5A @ 5V (or 6Vif I can find one). I will keep looking. For now I should probably just use a 5-cell and a modular design so I can change the PS later.

7th December 2007, 03:55 PM	(permalink)
Ambient	maybe I could use one of these things for object avoidance? It would be pretty interesting, but I don't know if a proximity detector will work properly in close proximity to 18 servos, since they have motors and are changing their position. Maybe put two detectors on shielded antennae? http://www.newark.com/jsp/Semiconduc...sp?sku=81K2770

6th June 2008, 03:04 PM	(permalink)
yanny_boy	Hi, I know this has 2 different servo controllers in one thread... but I am trying to make a servo controller using an 18f4550 and this first 2 pages seem exactly what I want, is there a recommended schematic/pcb as I am new to pics and am not sure what resistors and capacitors I need where to make the clock and usart happy.... any help would be great. thanks.