
Rob-bot
Hello All,
Anyone know how to wire/configure to use an RC ESC with linear actuator to be controlled by the EZ-B V4 and EZ-Builder?
Does it get wired/configured the same way as an H Bridge?
Also, if it is possible to do, how many ESC's can I use with one EZ-B V4?
The robot I am building will need 7 ESC's with linear actuators and one Sabertooth 2X32. I have no problem controlling the ESC/actuator with a Radio control PWM signal, so it seems it should be possible with the EZ-B V4.
Code:
thanx for the speedy reply and code. So, can I use any digital port on the EZ-B for the 7 ESC's?
Also, being the linear actuators do not provide any feedback, will I be able to control them other than 180 or 90 degrees? Basically, if I use different degrees will the actuator always be in those actual positions every time or would they eventually drift?
Without feedback you will be unable to use position control... I am guessing the actuator has end stops instead?
Do you by chance know of anyway to create feedback for linear actuator that don't have potentiometers?
I have seen some suggestions here on the forum to add potentiometer to linear actuators that don't have them, but nobody explains how to do it.
The linear actuators that come with feedback are outrageous priced, about 4 times the price of one without it.
I been tempted to buy cheap/affordable Chinese linear actuators without feedback, asfaik it's not easy/cheap to add a potentiometer to a linear actuator.
For a 12" linear actuator the difference between feedback and no feedback is only $25.
https://www.ez-robot.com/Community/Forum/Thread?threadId=11068 (Post #10)
A few hack/ideas:
Thread
Belt with a potentiometer
In my case where I am using ESC's instead of an H bridge, is there a way to make a servo controller work in conjunction?
For a 12" linear actuator the difference between feedback and no feedback is only $25.
https://www.ez-robot.com/Community/Forum/Thread?threadId=11068 (Post #10)"
PTP,
I thanks for posting those vids.
As far as the prices go, the sites you are referring to are charging 3x what you will pay for the same actuators without feedback and 4x for feedback on ebay and are made by chinese companies too. I found out the hard way a few years back when I ordered one for 3x times the amount, thinking the same thing, that they must be better. Even though they are all made in China the quality is actually pretty good as I have put a couple to the test to see if they can push/pull their listed weight and they have actually exceeded their rated weights before breaking on push test, but have failed the rated weight on pull tests and this is normal as all linear actuators can push more than they can pull by design. Better quality actuators have a push/pull rating on them, where the cheaper ones do not. Those sites do not sell in large quantities the way ebay sellers do and unfortunately have to charge these high prices in order to make a worthwhile profit.
I searched the Ebay with $50 i can get 12" linear actuator but no feedback.
I still think is too risky to spend $50 and then spend extra bucks to add the feedback without guarantee of success.
@AndyRoid:
Good tip!
I found a DIY version: https://www.thingiverse.com/thing:1926226
(Potentiometer: $15, retractable: $6 plus shippings and 3d printing)
or a kit version: https://www.andymark.com/product-p/am-2674.htm ($40)