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In my robot, i have 4 motors each with a ESC which all have a BEC. These ESCs run into y leads then into 2 channels in the receiver. The problem i think i have is that if all the BEC circuits in the ESCs are feeding the power into the receiver, is the receiver running at 20-odd volts and therefore making the ESCs a little hyper when it comes to slow movements being transmitted to the 'bot?!
also, just ordered a spectrum DX5e system. it does have a built in mixer doesn't it? in the past ive had a v-tail mixer whereas in the manual for the spektrum, the transmitter has a delta-wing mixer, are they the same?
MY DX5e doesn't have a mixer so you would need a V-tail mixer unless your your speed controller has a built in mixer.
I've got a mixer but the issue might be that the voltage it's getting is too high as something in the system isn't working at the moment. Gonna do some more testing to isolate the problem!
You would know pretty quick if you put 20volts through a receiver, the smoke would be rather evident. Unless you have managed to change the wiring then your BECs will be wired up in parallel, ie all positive lines connected together and all negative ones connected together. This means the voltage the receiver sees is the same but there is more current available. Check out some basic circuit theory on google (parallel and series circuits).
The power to the receiver doesn't affect the response of the speed controllers. It is the signal line (the white one) that comes out of the speed controller. Look on google at servo control (pulse width modulation) and you'll learn how the receiver communicates with the speed controller.
What speed controllers are you using?
sounds a little silly but the blue ones from ebay! been testing it and the issue is the mixer (all works without so its either the mixer doesnt work properly or the radio and mixer dont mix) , the radio gear is sadly fine but im using a GWS mixer and they are pretty good quality. looks like ill have to invest in a DX6i so i can do the mixing in the transmitter!
in my experience v tail mixers also stop the robot from fail safeing so be careful with that.
i think we've established v-tail mixers dont work then! lol. is programming a dx6i fairly straight forward?
they do work, never had a problem with them before i got a decent futaba set. I'd recommend getting a decent spektrum though.
they hard to program? ive cancelled an order for the DX5e as there are problems when running the built-in mixer apparently where full-ahead forwards or backwards only gives 50%. The DX6i apparently allows full mixing. will probably go for a gyro as well at some point
You can get a second hand dx7 off ebay the price of a dx6i, there no point in a gyro, if the robot is wired and setup right ( wheels level etc with each other it should drive forward not go to one side)
the 4 motors are running at very slightly different speeds so ill see how the testing goes with a new radio set
The DX6i system works great but i do need help with the set up. At the moment its:
right stick forward = spins clockwise
right stick back = spins counter-clockwise
right stick left = forward
right stick right = backwards
im running the Elevon wing type mix which mixes the elevator and aileron function. reasoning for this being that the right stick controls these functions. anyone know how i can get forwards=forwards, left = spin left etc etc????? the robot is tank steering type.
thanks!!!!!!
Perhaps you should swap the 2 cables you plug into the 2 reciever channels to get the forward stick to either make the bot go forward and backward, if it goes the wrong way the servo reversing function might help.
will servo reversing screw with the servo mix?
By the sounds of things, you've got your cables in the correct way, but got one motor wired up backwards.
When you push the stick forward, look at the motor (or motors, if you've got 4-wheel drive) on the side that's going backwards and then simply switch round the wires that are connected to that motor. Then if you push the stick forward again, both motors should go forward.
Then check the spin direction; if you push the stick left and the robot turns to the right, just flick the servo reverse switch for that channel (on most transmitters, left/right should be channel 1). The servo reverse function won't mess with the servo mix, it'll just help to adjust it to the correct setting. You may have to adjust the trims though if there is any creeping when the stick is central.
Sounds like 2 motors wired incorrectly and rotating the wrong direction.
As Jamie say's push the stick forward ..note the motors that are rotating the wrong direction and swap over the connections on the motor.
You can simplify it by having one side at a time plugged into the receiver.
All sorted! Swapped the polarity on one set of motors and swapped the esc plugs in the receiver. Thanks all!