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        Discussion ESC control through controller

#1 Syed Saad Jan 16, 2012 02:03 PM

ESC control through controller
 
Hi all.

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?


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.

#2 thewz Jan 16, 2012 02:10 PM

Quote:

Originally Posted by Syed Saad (Post 20442582)
Hi all.

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?


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.

There are a few things to try. If the ESC is connected to a motor with a prop remove the prop first then:

1. Reverse the throttle channel
2. Increase the throttle range to -125 (this may allow the ESC to see 0 throttle)
3. You may have a bad ESC?

#3 pug398 Jan 16, 2012 02:40 PM

esc has an arming safety feature built in where it will not arm unless it sees a low throttle condition at beginning. Low throttle is 1ms high pulse and full throttle is 2ms high pulse. Power up esc sending it a 1ms pulse (sometimes less) and wait 5 seconds and then gradually increase pulse width to start motor. After getting it going you can decrease the wait time to see how long it actually takes your particular esc to initialize. Most of the time you hear battery cells counted out in beeps and then a long beep indicating esc is armed then you can increase pwm.

#4 Syed Saad Jan 20, 2012 03:46 PM

Thank you all.

Finally got my motor running with the above stated method. Problem was woth the one bad 5v regulator.
My next target would be to control it's speed by a pot.

#5 Mortimer Jan 20, 2012 04:30 PM

"My next target would be to control it's speed by a pot."
Try something like this, it works.

#6 pug398 Jan 20, 2012 06:09 PM

Glad you got it going. I guess a pot might be the next step having it control a 555 setup as an astable oscillator and that in turn drives another 555 setup as a monostable multivibrator. Lots of servo testers/controllers used that circuit. Also maybe something like a picaxe 08M2 might be a good starting point. I think for like $15 for everything it will read in and output pwm and also do I2C commands. All in Basic! hehe :)


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