very trivial question . I have received the ezb today.Never used it.
I found no information saying if power plug is center pin positive or not , and if the voltage of my 6V Ni-MH battery is ok for internal voltage regulator of its controller .It will My servos require no more than 6 V. thamks for your help
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To understand more about controls, the learn section has tutorials. Here is a direct link to the tutorial that explains ARC and what a control is, such as the microphone: https://www.ez-robot.com/Tutorials/Lesson/21?courseId=6
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Now I'm working with servos. I discovered that the hitec servos I intend to use in my robot , when driven by EZB, don't do 180 degrees, but about 140 degrees only. When driven by something else they can do even more than 180 degrees. What can I do with ARC to get more degrees ?
I can't achieve that with EZB builder.
they give 0.61 ms (1),1,48ms (90°),2,38(180°)
I have instead:
0.56 ms (1),1.340 ms(90),2.140ms(180)
i attach here an oscilloscope image from EZB set to 180, and I get 2.140 ms.
2.38 would be ok, but EZB can't rise over 2,140 ms.
Hitec is a leader in servos, and I think they know industry standards.
I don't understand why V4 has all pulses so short, shorter than V3.
For example, the (1) pulse is too short (0.56 ms) for all servos I know.
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.
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.
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.
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.
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 ?