Syed Saad

Hi. I have bought a hobbyking 20 amp ESC (http://www.hobbyking.com/hobbyking/s...ontroller.html). The red of battery is conncted to red of ESC and black to black.The throttle signal comes from the controller to white wire of ESC a 50 hz sq. wave with a 10% duty cycle(18 ms low,2ms high). The three output wires of ESC drives the motor. But the motor does not show any movement. What's wrong i am doing?

huck1199

Your product link is broken.  Are you using the correct sized battery? 

Syed Saad

Here is my ESC
http://www.hobbyking.com/hobbyking/s...ontroller.html

Here is my battery.Zippy flightmax 4400mah 3s1p 15c

Steve Percifield

My Feedback: (14)

Just to make sure. You are hooking the 3 wire lead, with the servo plug on it, into the throttle port of your receiver, making sure it's polarity matches the receiver. When you power up, do you hear a series of beeps or tones from the ESC? The last series should be a series of 3 quick tones, indicating a 3 cell Lipo recognition. If all your wiring is correct, and you hear no tones, them check for loose connections or broken wires. If that is all ok, then you probably have a bad ESC. Return to Hobby King.

And make sure your battery is fully charged. The ESC might not be able to recognise a low battery.

Syed Saad

I am not using a reciever. I am dealing the ESC like the servo motor. The 50 hz wave(18ms high, 2ms low) goes to the white wire of the BEC. I hear 3 rapid beeps and when i connect the ESC and then beep after beep with a difference of about 8 to 10 seconds.

Steve Percifield

My Feedback: (14)

The beep after beep you hear is the same thing that happens when you pl;ug the esc into the incorrect receiver channel. It is not receiving the correct signal to operater. I have no idea how to help you with what you are doing.

exeter_acres

My Feedback: (2)

could be, but not always.. there are some setups.. that even if everything is correct...
when you plug it in.. it will beep.... until you apply throttle...
it is this way to remind the user that it is armed and ready to go.....

Syed Saad

Have any of you tried to control ESC with controller?

huck1199

Please describe what you are using to signal the esc.  Is it a signal generator?  If so it will have to vary thepulses to simulate rising and sinking throtle positioning.

Rodney

I think that the narrow pulse needs to be 1.5 milliseconds long or less, your 1.8 milliseconds may be to long a pulse for the low speed end. What is the repetition rate of the pulses? They should be about 20 to 25 milliseconds apart. The typical pulse size is 1.5 milliseconds plus or minus 0.5 milliseconds every 20 to 25 milliseconds.

Syed Saad

I am sigaling the ESC with the PIC microcontroller. A 2 ms high pulse is applied after every 18ms, like we do to control the servo.

huck1199

Could you use a servo tester to do what you want? Or are you trying to automate some process?  See this tester at HobbyKing

http://www.hobbyking.com/hobbyking/s...dProduct=11780

Redback

My recollection is that the control pulse should vary from 0.5 to 1.5mS depending on the control input. If you are feeding the controller a constant duty cycle pulse this may be the problem. Most ESCs will not arm if the throttle is not at low.

Check out this reference - www.omegaco.demon.co.uk/mectnpdf/mectn004.pdf


Terry

Syed Saad

Thank you all.

Finally got my motor running. 19ms low pulse and then 1ms high. Repeated for about 5sec unless i heard a comparitively longer beep that comes when the ESC is armed. Then the on time was increased to run the motor.
My next target would be to control it's speed by a pot.

huck1199

Sounds interesting. Can you tell us what you are constructing? I am interested in embedded systems and pic controlers.

Syed Saad

My goal is to make a RC Quadrotor.Up, down, left, right, forward, backward and hover. Wireless data transfer would be through XBee and the controlling will be done through PIC micro controller.