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View Full Version : The Sub Micro Die Cast Metal Ferrari with 2.4Ghz Proportional Control


EQMOD
2011.02.03, 11:38 PM
I got this small car with some surface details. I planned to convert it to 2.4Ghz Proportional with a little challenge on the space consumed by the bucket seats.;

http://i263.photobucket.com/albums/ii128/EQMOD/ferrar_24ghz_001.jpg


The idea is to use the very thin profile RX receiver from Futaba - 2.4Ghz FHSS R603GF with the casing removed. Also added a couple of servo boards for the steering actuator driver and the main drive motor;

http://i263.photobucket.com/albums/ii128/EQMOD/ferrar_24ghz_002.jpg

To be able to fit this inside the limited space, i need to use smaller servo boards and potentiometers that should not consume much space. I got a couple of 5kohm surface mount pots which is smaller than the servo boards. This is for the center 0-volt adjustment needed to put the motor/actuator at rest at center wheel/throttle;

http://i263.photobucket.com/albums/ii128/EQMOD/ferrar_24ghz_003.jpg

This allowed me to fit the rest of the electronics compensating for the space consumed by the bucket seats. Almost the entire part of the receiver is under the seat including the steering actuator driver;

http://i263.photobucket.com/albums/ii128/EQMOD/ferrar_24ghz_005.jpg

EQMOD
2011.02.03, 11:47 PM
With the casing in place;

http://i263.photobucket.com/albums/ii128/EQMOD/ferrar_24ghz_007.jpg

and the 2.4Ghz antenna protruding at the back;

http://i263.photobucket.com/albums/ii128/EQMOD/ferrar_24ghz_006.jpg

Size comparison with the TX that will control it - A Futaba 2PL-2.4Ghz 2 channel transmitter. The EPA and D/R functions of the TX is highly needed to tame those motor and actuator for a natural and stable proportional control;

http://i263.photobucket.com/albums/ii128/EQMOD/ferrar_24ghz_00e.jpg

Charging of the small 1S Lipo is done through a generic helicopter transmitter/charger.

http://i263.photobucket.com/albums/ii128/EQMOD/ferrar_24ghz_00d.jpg

EQMOD
2011.02.03, 11:48 PM
showing some details of the ****pit and engine bay. You wouldnt imagine that the futaba RX is under that floor panel;

http://i263.photobucket.com/albums/ii128/EQMOD/ferrar_24ghz_008.jpg

http://i263.photobucket.com/albums/ii128/EQMOD/ferrar_24ghz_009.jpg


Size comparison with my other 2.4Ghz converted micro RCs;

http://i263.photobucket.com/albums/ii128/EQMOD/ferrar_24ghz_00b.jpg

EQMOD
2011.02.03, 11:48 PM
Videos:

Here is a quick test of the controls;

http://www.youtube.com/watch?v=ekKcMnNgMu4


Quick floor tests of the proportional control;

http://www.youtube.com/watch?v=LC5yLgM346s


Here is the interesting part - adjusting the EPA's and D/R rates for a smooth transition;

at 20% EPA on the throttle, the car is already kinda jerky;

http://www.youtube.com/watch?v=_ZvdKgrPrFI


But at 10% EPA, throttling transitions are now somewhat smooth;


http://www.youtube.com/watch?v=Fi7NT2kKIeM


For the steering actuator side, only 10%EPA is needed to activate the actuator coil enough to steer the wheels at the end points for the entire range of steering wheel.

EQMOD
2011.02.03, 11:49 PM
with an onboard cam - driving with view from the ****pit side;

http://www.youtube.com/watch?v=-B0C1_DmPPQ

View of the wheels in action;

http://www.youtube.com/watch?v=fqlghdYLv4k

EQMOD
2011.02.03, 11:49 PM
LIGHTS ... Camera .. Action !

Activated the LEDs ...

http://i263.photobucket.com/albums/ii128/EQMOD/flfr_002.jpg

http://i263.photobucket.com/albums/ii128/EQMOD/flfr_001.jpg

http://i263.photobucket.com/albums/ii128/EQMOD/flfr_003.jpg


Videos:


http://www.youtube.com/watch?v=f4wlMTvJlDY


http://www.youtube.com/watch?v=pn75Rzb5j1g

EQMOD
2011.02.03, 11:54 PM
MICRO Brake Lights:


This time i decided to add a simple brake light circuitry which probably will have further modifications for better execution.

The idea is to 'brighten' the rear LED taillights the moment it gets the brake/reverse command from the transmitter.

http://i263.photobucket.com/albums/ii128/EQMOD/flfr_001.jpg

The existing headlight and taillight LEDs get their power from the car's main power source (lipo battery). We need to properly mix this source from any signal source coming from the ESC which is currently using a servo control board as a main motor driver.

http://i263.photobucket.com/albums/ii128/EQMOD/flfr_006.jpg

and here is the layout as applied to a very small Ferrari car. This is just the first version of the circuitry which may have further improvements which we will describe further on this thread.

http://i263.photobucket.com/albums/ii128/EQMOD/flfr_005.jpg

Here are a couple of DEMO videos of the Brake Lights in action;



http://www.youtube.com/watch?v=yFBg3Yx0Suk


http://www.youtube.com/watch?v=K8gVhuPlRds

Night Driving .... :D


http://www.youtube.com/watch?v=OCk9D9V9X3Y

EQMOD
2011.02.04, 12:02 AM
PROPORTIONAL STEERING WITH THE MAGNETIC ACTUATORS


Here a little demo of the actuator based steering proportional control. Watch as i make a combination of sharp and wide turns. The idea is to vary the current on the actuator coil which is basically a magnetic coil pull vs. the spring return steering arm pull to center balance. The more you apply current on the coil, the more the deflection on the steering wheels;




http://www.youtube.com/watch?v=B8mwE2aDxmk