Search found 9 matches

by vector357
Thu Mar 20, 2008 7:34 am
Forum: Robotics
Topic: Servo Problem NEED HELP
Replies: 14
Views: 6867

So far, there have been posed many solutions, and many of them I believe I could easily build myself. However, it seems that component testing and lots of R&D and Money are needed to try any of these ideas. It looks like I'm the only person on the planet that has this dilemma of trying to convert a ...
by vector357
Wed Mar 19, 2008 12:42 pm
Forum: Robotics
Topic: Servo Problem NEED HELP
Replies: 14
Views: 6867

I haven't had the opportunity to do much with robots, but that was sure impressive. That thing carried a 300 lb load divided into 4 packs on it's back, up the side of a step hill, and just kept going. That is some impressive pack mule.
by vector357
Wed Mar 19, 2008 4:29 am
Forum: Robotics
Topic: Servo Problem NEED HELP
Replies: 14
Views: 6867

Yes, there are 5 Input channels that control 4 axis. THR, RUD, ELE, AIL, and PIT. All these signals are mixed in the uC with the Gyros output, and the axis is kept level. Transmitter is normal 6 channel RC radio. The uC controls the 4 motors in unison as well as semi independently, to allow this to ...
by vector357
Tue Mar 18, 2008 3:54 pm
Forum: Robotics
Topic: Servo Problem NEED HELP
Replies: 14
Views: 6867

Greetings Vic, The ESC Accepts the same kind of signal as the Direct Output from the Rx, which is a single pulse of PWM So the next step is to measure the timing of the PWM signal from the control board, and note the repitition time (ms), signal for min and signal for max (us). Also confirm the sig...
by vector357
Tue Mar 18, 2008 2:14 pm
Forum: Robotics
Topic: Servo Problem NEED HELP
Replies: 14
Views: 6867

philba wrote:good advice. One minor point - the servo pulse width will run from 1 to 2 mS.
So that means 1 to 2 ms is the common accepted signal for an ESC.
by vector357
Tue Mar 18, 2008 2:10 pm
Forum: Robotics
Topic: Servo Problem NEED HELP
Replies: 14
Views: 6867

Greetings Vic, The bottom of the Diag should say Brushed Motor in stead of ESC's Got it! So the controller is already sending four channels of PWM signals to the existing motors? CORRECT I jumped to the conclusion that you had R/C servos, but more likely you have DCPM (brush motors) running from PW...
by vector357
Tue Mar 18, 2008 1:33 pm
Forum: Robotics
Topic: Servo Problem NEED HELP
Replies: 14
Views: 6867

Give me a few minutes, and I will post a quick diagram of what I have. >Yes. As you have multiple motors, do you also have multiple "channels" on the radio link? The motors all work in unison in conjunction with the gyro to maintain a stable and level flying platform. The THR signal from the receive...
by vector357
Tue Mar 18, 2008 12:56 pm
Forum: Robotics
Topic: Servo Problem NEED HELP
Replies: 14
Views: 6867

Hi, thanks for the info. I learned most of that a long time ago, and when you don't use it, you loose it. Or at least I kind of did. Let me see if I follow you, The "Demand" is From Rx to uC Right? or is Demand the signal going from uC to the FET's? A Multiple Duty Pulse is coming out the uC, but a ...
by vector357
Tue Mar 18, 2008 10:19 am
Forum: Robotics
Topic: Servo Problem NEED HELP
Replies: 14
Views: 6867

Servo Problem NEED HELP

I am trying to convert a Walkera X-UFO that has 4 Brushed motors to be able to use Brushless motors. The Signal coming out of the Rx is PWM, and the signal going to the gate of the FET's is a Pulsed signal. Here is the Time's I got. Hori Div = 2v div. Vert Div THR IN 1v div Vert Div THR Mix Out .1v ...