I have the ezb4.... I just tested a spare HS-805bb I have.... using the basic horizontal servo control I got about 170deg rotation.... The servo can move a little bit more by hand, but not much... Close enough to 180 for me. Certainly much more than 140 you mentioned...

can you measure the pulse duration with an oscilloscope ?

I don't have an oscilloscope... I just tested it with a servo horn.... set the servo to 1 and then 180... It moved 170 degrees...

never mind. I'll test with horizontal servo control as you have done. I tested with "movement control (gait)". Perhaps there might be some difference between the two controls. I should have the same results you had.

Hi Richard, all controls in EZ give the same result. Not possible to achieve 180° for Hitec servos from EZ. I measured accurately , the maximum is 163°. According to DJ Sures Hitec doesn't meet servo standards . Unexpected thing for a world leader in servos. I'll investigate if Hitec programmable digital servos (HS5805MG) could help.

First, i would question if the servo you have is actually Hitec and not a clone. Clones are very popular on eBay and even more hobby shops carry them without knowing.

Second, i should expand on my statement regarding not following servo standards by stating that "there is no standard anymore". Maybe that's easier to digest. The original servo specification was never defined in any ISO or standardized document back in the 70's. As time went on, more servo manufacturers were designing servos and specific models of servos which adhered to their own specifications..

The trouble is that you can purchase servo models from 1,000 servo manufacturers and they will all have a different range based on the PWM cycle.

When EZ-Robot designed our servos, we compared with nearly a hundred different models and brands. This has been discussed in detail on other threads. There's a reason why ez-robot is the only company able to achieve what we have accomplished, and that's with diligence.

Our servo PWM was defined by taking an average of servo positions. This is because the GAIT and usability of EZ-Robot Revolution product requires absolute standardized positioning - which is an obvious statement. 90 degrees on all ez-robot servos must be 90 degrees.

Well, adding 3rd party servos to the mix made things complicated because, as you have noticed, there is no "standard".

Note: if the question in this thread had been answered, please select the individual who assisted with your question.

OK, DJ. there is no standard. Simply EZ servos and hitec's ones are different. I suggest some software improvement to ARC so users can configure pwm range for their servos . It should't be a complicated work. All users may buy from different makers and even cloners, and would benefit from such improvement.

I'm now testing Hbridge PWM control panel. It works well, but I don't understand some details, I don't find explained in tutorials.

1)When I start EZb, I find both PWM sliders set to maximum, but giving all commands, the motors don't turn, because the PWM pins give no pulses, and are at logical zero. I have to move the sliders in some way to make them turn. Why?

2)I click to use arrows keys .It works, but if I now move the sliders, the arrow keys work no more, and I have to use the mouse again. Why ?

3)how to return from arrow keys to mouse without having to move the sliders ? Toggling the button doesn't help.

I think sliders shouldn't affect other functions, and could be saved in the desired position independently of other functions.

I'm an untrained ezb user, or is there some bug ?