HZ Super cub, normal ESC with Stock electronics Project

[Mr_westie]

I think I am starting to fry the stock motor.
It is not getting as much power as it used to.
Have been running it on 3s Lipo for about 30 mins of it's life.
And lugging a 200g camera for half of it.
Total age of motor, 60 mins.

Rather than forking out and replacing with normal electronics I though I would try my luck with making an adapter.
That is something that will plug into the motor connector and translate the pwm output to servo output.
So you can happily use any motor/esc combination you like.

1. See what frequency the esc is using with a oscilloscope.
1 khz
The active area of the slider is only 50% about he middle.
So 0-25% is dead area, 75-100% is full on.

2. Make interface circuit.
A simple voltage divider seem to do the trick.

3. Code the micro to do translation
Due to my poor coding skills I can only get 100 steps of resolution out of it.
I can get more if I make the code more efficient.

4. Test
Will update as I go.



Just stop me if this has been done before :)
I tried searching but didn't come up with anything.

[davemac2]

I think I am starting to fry the stock motor.
It is not getting as much power as it used to.
Have been running it on 3s Lipo for about 30 mins of it's life.
And lugging a 200g camera for half of it.
Total age of motor, 60 mins.

Rather than forking out and replacing with normal electronics I though I would try my luck with making an adapter.
That is something that will plug into the motor connector and translate the pwm output to servo output.
So you can happily use any motor/esc combination you like.

1. See what frequency the esc is using with a oscilloscope.
1 khz
The active area of the slider is only 50% about he middle.
So 0-25% is dead area, 75-100% is full on.

2. Make interface circuit.
A simple voltage divider seem to do the trick.

3. Code the micro to do translation
Due to my poor coding skills I can only get 100 steps of resolution out of it.
I can get more if I make the code more efficient.

4. Test
Will update as I go.



Just stop me if this has been done before :)
I tried searching but didn't come up with anything.

yes it has been done before. :) There are one or two out there you can buy for around $20-40:

Brush2less (scroll down on page) (http://www.helihobby.com/html/ESKY1.html)

EZ-ESC $25 (http://www.rcuniverse.com/forum/m_5735217/anchors_5735217/mpage_1/key_/anchor/tm.htm#5735217)

One on Ebay (http://cgi.ebay.com/Brushless-converter-for-microhelicopter-keep-your-4in1_W0QQitemZ320197056682QQihZ011QQcategoryZ34056 QQssPageNameZWDVWQQrdZ1QQcmdZViewItem)

cheers,

Dave mc