ESC Help Pls

[Silver_Titan]

I recently bought a GWS ICS-480E and a ACE RC ESC-10 speed controllers for a project for my school course.

i connect the motor the the output of the speed controllers, the battery power too.

How about the other 3 inputs which is suppose to be connected to the throttle outputs. As i not using any throttle outputs, i face some difficulties in getting them started.

Anyone can tell me technically how to activate the speed controllers, i am actually using micro-controller to send pulses to the esc.

for the 3 wires, what input should be expected for the motor to move.
pls kindly help me. thanks.

reply to this post or email me if possible at silver_titan@hotmail.com
thanks in advance

[PentiumPC]

the 3 pins work like a servo input.

[Silver_Titan]

ok thanks

[Artyspec]

Did you know if u dun use an Rx, u can control the motor speed juz by controlling the voltage?(i see using brushed motor), if u wanna use a ESC u rly gotta debug the rx signals.

[X34]

Did you know if u dun use an Rx, u can control the motor speed juz by controlling the voltage?(i see using brushed motor), if u wanna use a ESC u rly gotta debug the rx signals.

Touche!

[Super-Hornet]

For what I know, the ESC i/p, which is signal from Rx, is a square wave pulse. The 3 wires are:
Black/Brown = Ground/-ve
Red = +ve (Normally 5V)
White/Orange = Signal line.

ESC sense the pulse... which is periodical signal of Square wave. The +ve side of the square wave duration (time) is varies according to what you want the motor to spin. If I'm remember correctly, longer pulse meaning 0 speed. short pulse meanning 100% speed (or vise verses? Can't recall. U should able to find it in the internet)

SH

[PentiumPC]

For what I know, the ESC i/p, which is signal from Rx, is a square wave pulse. The 3 wires are:
Black/Brown = Ground/-ve
Red = +ve (Normally 5V)
White/Orange = Signal line.

ESC sense the pulse... which is periodical signal of Square wave. The +ve side of the square wave duration (time) is varies according to what you want the motor to spin. If I'm remember correctly, longer pulse meaning 0 speed. short pulse meanning 100% speed (or vise verses? Can't recall. U should able to find it in the internet)

SH

it is called PWM, the duty cycle controls the position of the servo.

[Super-Hornet]

If you are talking about ESC O/P to motor, yes it is PWM. Frequency fixed but cycle percentage differences.

For ESC i/p, it is square wave instead... Not PWM. The ESC I/P actually measuring the duration of high state of Square wave.

Edit: It is called PCM (Pulse Coded Modulation) instead.
Here is a link for servo signal:

http://www.seattlerobotics.org/guide/servos.html

SH

[Super-Hornet]

Another useful info:

http://www.epanorama.net/documents/motor/rcservos.html

http://www.geocities.com/hobby_robotics/was.htm

http://www.vantec.com/servo.htm

http://www.geocities.com/BourbonStreet/3220/servobasics.html

[PentiumPC]

If you are talking about ESC O/P to motor, yes it is PWM. Frequency fixed but cycle percentage differences.

For ESC i/p, it is square wave instead... Not PWM. The ESC I/P actually measuring the duration of high state of Square wave.

Edit: It is called PCM (Pulse Coded Modulation) instead.
Here is a link for servo signal:

http://www.seattlerobotics.org/guide/servos.html

SH

RC signal is a modified PWM, technically you can say it is not PWM, my bad.

er.. PCM is digital coding.. don't know why the site called it PCM??

cheers,

[Demented]

erm... let me do abit of typing...

there are many many ways to communicate ...the easiest way is to talk if you wish to increase the range, u shout in order to further increase the range u amplify

now... u might think i am typing nonsense at this hr...(im starting to doubt too ) I'm not... lets more on...

lets put it this way... in physics, the higher the frequency the further it is capable of traveling (provided same amplitude/loudness) invention of radio becomes an interesting topic as we can hear voices from km away(radio station)

In early dayz analog voice data (i'll call it as data from now) is "modulated" (superimposed) onto a "carrier wave" (a much higher electromagnetic frequency) thus the carrier wave lets say... 20.4Mhz is not change... only the amplitude is changing in relavent to the data... this whole thing is called Amplitude Modulation...(AM) very noise and lousy quality... nolonger in use...

Nowadayz instead of using AM, the data is modulation alongside with the carrier wave... so the amplitude is not change... only slight variation of the frequency... so this method is called Frequency Modulation (FM) ... superior to AM but still not very good quality...

PCM that u guys r talking about is Pulsed Coded Modulation ... is where a digital representation of an analog signal where the magnitude of the signal is sampled regularly at uniform intervals, then quantized to a series of symbols in a digital (usually binary) code.

The 2main type of coding for RC purpose :
*Differential (or Delta) pulse-code modulation (DPCM) encodes the PCM values as differences between the current and the previous value. For audio this type of encoding reduces the number of bits required per sample by about 25% compared to PCM.

*Adaptive DPCM (ADPCM) is a variant of DPCM that varies the size of the quantization step, to allow further reduction of the required bandwidth for a given signal-to-noise ratio (SNR or S/N).

NOW PCM happens in between TX AND RX ... rx will demodulate the codes/signal and output a PWM (pulse width moduated) waveform to control servo/esc...

Pulse-width modulation of a data involves the modulation of its duty cycle.



ERM... if your servo can take PCM... y not build it with solar cell and u will end up with a stand alone unit... no need batt no need rx just give it light and it will work...

hope this is informative and will help some plp know more about rc terms n jagons...

[PentiumPC]

erm... let me do abit of typing...

ERM... if your servo can take PCM... y not build it with solar cell and u will end up with a stand alone unit... no need batt no need rx just give it light and it will work...

hope this is informative and will help some plp know more about rc terms n jagons...

er.. which part of this post says that the servo can take PCM directly??

what Super Hornet says is that the servo signals are not PWM, which technically I agree, but everyone know you can control a Servo with a PWM with a duty cycle between 10% to 20%.

why that site confuses PPM with PCM, I don't know.

sorry, really don't know what this post is about..

Cheers,