
bret.tallent
USA
Asked
— Edited
I have several HD servos to operate so I need external power supply. As I am inpatient to wait for ez bits, how do I go about supplying external power for these servos? I am okay with modifying the EZ-B v.3, I just don't know what I need to do. Help, anyone?
I have them attached in the smaller block of DIOs and was wondering if it was possible to only alter these, or if the alteration affected all DIOs?
Like this then?
Thanks
Rich
I will be using a 11.1volt 3500mAh lipo for the lot with a 8amp UBEC at 6volts for the servos. I can plug the lipo (will have a lipo alarm) straight into the EZ-B though, is that correct?
He will also have a small 6volt Nimh pack to drive his charge level panel that will be able to be solar charged when he opens his solar panels.
Wall-e will be having 17 or 18 servos plus a heap of peripherals this would mean that I will need two EZ-B boards from what I have read and been told.
I will try and get some progress photos done tomorrow.
Rich
It also hasn't been mentioned that the EXT PWR SEL (External Power Select) can be used in this case for D0-D14 pins, you just cut the trace underneath the board and solder your 6V from the battery to the solder pad closest to the D0 pin. This way you don't have to put any external wires to the servo, just plug it right into the board as you usually do. This idea was brought forward from the original EZ-B boards which all had an external way to supply power to your servos if you wanted to use large torque servos.
I guess a discussion that has already been started is one about battery selection which is also very important in high torque motor use. I suggest we start a new thread about battery selection.
v/r
Kevin
Thanks for the info, I now understand it much better and thought it was strange that my first diagram was wrong as I tried both methods using a RC receiver and two separate power supplies, a 4.8v to power the receiver and a 6v to power the servo and my second diagram did not work. The diagrams were for reference only and as I am a electronics dummy. As I will be using a common power supply and the ground will be common.
Also if you have the or know where I can find the "how to" on the EXT PWR SEL would be great, I have no problems if I have clear wiring diagrams and instructions and my soldering skills are good.
Good idea that someone starts a new thread about battery selection.
Thanks
Rich
Great idea and I have a spare lipo charger(12volts/5amp input)but Wall-e is not that big and his solar panels(60mm x 60mm) only put out about 3.5-4 volts each not sure what amperage but those chargers need a constant 5 amps. I could add 2 more panels but where do I stop..lol this project will never get finished.
Rich
Cover up flat spaces with these , walle is a box so this is easy. Cells can be cut as long as you don't cut the main connection , cutting them reduces voltage to plan to connect cells for 16 to 17 volts so after losses you still have 13-14v for charging
http://www.ebay.com/itm/Small-Solar-Cell-6-7-V-30-mA-Micro-Power-BEAM-Solar-Battery-Solar-Panel-/160731328453?pt=LH_DefaultDomain_0&hash=item256c556fc5
http://www.ebay.com/itm/Grade-125x125-Monocrystalline-Solar-Cells-2-8-Watt-Mono-5x5-Photovoltaic-Lot-/120775475856?pt=LH_DefaultDomain_0&var=&hash=item61cc995fe0
THESE ARE HIGH EFFIENCY AND WOULD BE.IDEA http://www.ebay.com/itm/Grade-125x125-Monocrystalline-Solar-Cells-2-8-Watt-Mono-5x5-Photovoltaic-Lot-/120775475856?pt=LH_DefaultDomain_0&var=&hash=item61cc995fe0
Part No. : D5733 . Voltage : 6 Volt . Capacity : 4.5 Ah . Chemistry : Sealed Lead Acid . Color : Black . Height : 4.17 in. . Width : 1.85 in. . Length : 2.76 in. . Start Temp. (Min) : 5 Deg. F . Start Temp. (Max) : 104 Deg. . Terminal : F1 . Weight : 1.83 lb. . UL Listed : Yes .Warranty : 1 Year .Order Code : UB645
Just bought two for 18 USD shipped New!
http://www.ebay.com/itm/120844794887?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
These will accept a low ampere charge well , sealed , gel/glass filled
Charger 6v , 1 am hr , charges up in about 4 hrs
7 bucks shipped , buy two and charge extra battery.
J.W.