Servo turn max position but not respond

Other Hardware Motors, Mechanics, Power and CNC
1

Hello.
I have 2 servo hitec hs 805 bb, an Arduino Uno.

I tested for a few weeks different code ... i learned the basics of servo programming on Arduino ...

Everything was working ... I was able to give position orders to the servo ... and they were doing the job.

3 days ago, my 2 servos have bent to "turn" ...
I thought they were dead ...

And today i tested with a new power supply (5v 2a, like the last one) ...
and my biggest surprise, my 2 servo moved ....

My problem is that currently, my 2 sevo hs 805 bb, turn to a "max" position, and hangs ...

If i disconnect the power supply, and i manualy move the servo position, when i connect the power supply, they turn, and do not move anymore ...

I tried several code, including the basic ones present on arduino (Knob, Sweep) but my servo does not obeisse ... they move all alone and hangs ...

I also tried different pin ...

I do not know what to do ... I searched the internet, forums, I asked some people I know who use arduino, but I have not found an answer ..

Please, help me !!!

2

A 2A power supply is nowhere near enough for two of those huge servos. The no load running current is almost 1A so the stall/startup current is going to be at least 3A or 4A, possibly considerably more.

I'd probably use some RC batteries like Sub-C NiMH rechargeables. If you want a power supply I'd try something like 5V 10A. The power supply should be just for the high-power demand servos with the Arduino powered separately (and all the grounds connected).

Steve

3

Datasheet lists a stall current of 6A, so a 10A supply will be struggling for two servos.
Leo..

4

Thanks slipstick and WAWA.
Yes need best powersuplY...

But..in the past they made their job with 5v 2a...
So WHY now they dont make???

I will order a better power supply tomorrow.