Electronic speed control

Has anyone tried building a speed control for a small radio control dc motor?

I have a Futaba radio which I am going to use for this project.
Any ideas where I cam start?

Has anyone tried building a speed control for a small radio control dc motor?

I have a Futaba radio which I am going to use for this project.
Any ideas where I cam start?

The 16F648A has a PWM on the B Channel.. this you can use for a motor control speed extremely easily... a N Type Mosfet and the pwm will allow you to do close to the entire range of the motor. (depending on the motor voltage).

Dwayne

Will these be enough? So, using PWM output from the PIC should be enough to drive the MOSFET. Will a FET do?

Hello actionplus

actionplus >>Will these be enough? So, using PWM output from the PIC should be enough to drive the MOSFET. Will a FET do?<<

Yes it was enough...We used a 648A PWM... Got it working.. then attached a MOSFET to it, and ran a 12 volt model airplane motor and cycled the RPM's from 0 to 255 (255 being 100 percent). The Mosfet could handle 10 amps? and was about 1 dollar at the most... We only made one mistake... we accidently made a spark on one side of the circuit, and blew the PWM pin on the 648A...<chuckle> So use a Isolator when you are playing around with live ammo...We ended up using that 648A for other application that doesn't need that PWM port...<g>..

We also thought about using that same 648A chip for a LCD controller in 4 bit mode... Since the pin we blew was in the LSB of the LCD, and the LCD uses the MSB in 4 bit mode...We would assign the Data/Comand to pin B0, the Enable to B1, and ignore Pin B3 (our wonderful blownup PWM pin from our 12 volt sparky mistake <g>)

Dwayne

Any recommendation on the MOSFET? Who did you guys use?

I believe it was the IRF540N

We had 3 or 4 different kinds...But I believe we used the
IRF540N...Because I ordered another 5 of them <g>
When I get home, I will find out for sure...Any should work...



Dwayne

Hi, Dwayne

IF you want, I Already made one with 16F628...All features available ( radio and batt Fail-safe, opto-isolated, and Fet Driver !!!)

If you want to simplify the design, code is all right ... no bugs !!!

Alain

Is there anyway you can send the info to my email address.
[email protected]

Hi Acetronics

Why don't you publish your speed-control project
here so we aLL can benefit for this very good try of yours?
Keep up the good wotk

Thank you in advance

Hi, bitmaniac

May be am I a bit shy ???

In fact too much projects to show...

I realised an entire line of accessoiries for Airplanes and Boats ...just for friends and my own use.

Talking about speed controllers... What do you think of a twin stack one W/ differential coupling, linear speed curve, and fiber-optics transmission to power Mosfets...and of course all possible securities... All in a 16F876

May be I prefer good friends to honors ...

Alain

Hello actionplus,

what you can do, is hook up your 648A chip... pin B3 is your PWM...

put about 20 k resistor from B3 to ground, and have that same pin to go the gate of the Mosfet...Then connect up your Mosfet drain to a 20+k resistor to positive (load for it) and put your motor in parallel with this resistor.

It should work like a charm...I will try to workup a schematic if you want.

Dwayne