Adafruit 16Chan 12bitServo Shield - Is the Power supply ok ?

[3xbs]

hi,

is this mode of power supply ok
or is it bether to split the supply to two connectors



the arduino has a power supply with 5V and 1,5A plugged in
like this demo



the power supply in the pic is only for the testing here
i will order your big one in a weak :)
https://www.adafruit.com/products/658

the documentation https://learn.adafruit.com/adafruit-16- ... it-library
say :

Plug the shield into your Arduino, and a servo into the left-most 'port' as shown on the previous page and upload the example code. Don't forget you will also have to provide 5V to the V+ terminal block. Both red and green LEDs must be lit.

but it say's nothing about : dont or you can use the power supply from the mainboard ;)


mfg

ben

[adafruit_support_bill]

Code: Select all

is this mode of power supply ok 

It is probably OK for one or (maybe) two servos. More than that will overload your Arduino voltage regulator.

I see you are using an adjustable voltage power supply. If it has a 7v setting, use that. Otherwise use the lowest voltage setting between 7 and 12v to minimize the strain on the Arduino regulator.

[3xbs]

ok thank you for the answer :)

i will redesign my voltage system so i use a 5V 2A Power suply for the arduino and later
this month i think i order your power supply for the servo shild and 1-2 other shilds too

at moment this little supply from the photo will only power the servo shild for 1 servo of
my prototype

( can you write your answer in the servo shild documentation to prevent the arduino regulator
for overload ) > https://learn.adafruit.com/adafruit-16- ... it-library

mfg and a nice weekend to you

ben

[inof8or]

This is still a bit mysterious to me. Maybe because I'm trying to drive 6 pager motors instead of servos. (the vib motors in the store)

Please forgive my ignorance this might seem obvious.
----->Where is PWM pin power drawn from? The i2c chip or the terminal power-supply? (blue block)

If its from the chip, I think I got the wrong thing for the project (can get 6 pwms from my yun that are too weak to drive pagers just as well)

If its from the supply I guess just need to know if driving the pagers are with in the capability of the shield without using darlingtons or something to that effect.

[adafruit_support_bill]

The PWM pin power comes from the Arduino 5v supply. The external supply connects to the V+ pins.

These are designed for driving RC Servos where the power is supplied separately from the control signal. The PWM signal is a control signal. it can't directly power motors. You could add transistors on the PWM pins to switch current to the motors. A ULN2803 would be a good choice:
https://www.adafruit.com/product/970

[inof8or]

Thanks Bill, that's what I was afraid of.

Leaped before I looked on this one, should have bought more ULN2803s.

At the time bought, figured I might use more PWMs. This shield would have been great for that.
However, also made a bad assumption the pins were somehow powered separately.

oh well, I'll find another use for it (-;

[Franklin97355]

oh well, I'll find another use for it (-;

16 channels of servos, sounds like a robot to me ;)

[3xbs]

^^

ill post pictures in a month or two :)