Arduino code Answered

Somehow it still works, do you know why?

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What is the point of your question ? If it works, it drives your relay as you wished.

As it is, your program really looks like this to the compiler.

#include <Servo.h>
Servo ThrottleServo;
void setup()
{
pinMode(13, OUTPUT);
}

void loop()
{
digitalWrite(13, HIGH); // ALERT!
ThrottleServo.write(97); // Go to neutral throttle position
}

....and I don't see any reference to a relay there at all.

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I can't figure out the part where I make the esc always go forwards (except at idle postion), at varying speed. I commented out most of the code, because you might be able to learn from chowmix12's code, but you can't really do much with that code the parts commented out. I am hoping to make it easier for someone to help me figure out what it takes to get it to create this code.

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Try this minimalist version, and note my comments about what does what.

/* created 2005
by David A. Mellis and chowmix12 modified by Justin Baker*/

#include<Servo.h>
const int relay = 10;
Servo ThrottleServo;

int ServoVal;
int RCinput;
int PWMpin=2;
int relayState = LOW;

void setup() {
pinMode(relay, OUTPUT);

pinMode (PWMpin,INPUT);
}


void loop()
{
RCinput = pulseIn(PWMpin, HIGH, 20000); //measure input pulse
ServoVal = map(RCinput, 520, 2370, 0, 180); //scale input pulse
if(ServoVal>90) digitalWrite(relay, HIGH); //Turn ON reversing
else{

ServoVal=180-ServoVal;

digitalWrite(relay,LOW); //Turn OFF reversing
}

ThrottleServo.write(ServoVal);
}

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This code lets me have little esc control. The esc goes fast and the speed sent gradually declines, then it does that again. The only control is if I tell the receiver to go in reverse, then there is is a short burst in the opposite direction before it starts the loop to go fast and decline in speed.

/* created 2005

by David A. Mellis

modified 8 Feb 2010

by Paul Stoffregen

http://www.arduino.cc/en/Tutorial/BlinkWithoutDela...

*/

#include<Servo.h>

const int relay=10;//relay pin

Servo ThrottleServo;//used to set the relay

int ServoVal;// create servo object to control a servo

int RCinput;//stores receiver's voltage

int PWMpin=2;//the pin where you connect to receiver data pin

int relayState = HIGH;//keeps mosfet off

long previousMillis = 0; //last time led was updated

long interval = 1000; //needed for interval for confusing multitasking code

void setup() {

pinMode(relay, OUTPUT); //make relay spot an output

ThrottleServo.attach(9); // attaches the servo on pin 9 to the servo object

pinMode(9,OUTPUT);//make servo an output,a needed part of chowmix's code

pinMode(PWMpin,INPUT);//chow mix did not say you need to declare the PWM, but to be safe...

}

void loop()

{

RCinput = pulseIn(PWMpin, HIGH,20000);//read frequency of receiver

ServoVal = map(RCinput, 520, 2370, 0, 180);//scale input pulses

if(ServoVal>90) {

digitalWrite(9,HIGH);//code from chowmix

ThrottleServo.write(ServoVal); //should send signal to that position it reads

}

else{

ServoVal=180-ServoVal;//reversing

digitalWrite(9,HIGH);

ThrottleServo.write(ServoVal);

}

unsigned long currentMillis = millis();//seconds progam has been running

if(currentMillis - previousMillis > interval) { //make sure relay was updated in under a second

previousMillis = currentMillis;

if (ServoVal >= 90)

relayState = LOW;//this will leave a mosfet on, turning the relay on

else relayState = HIGH;

digitalWrite(relay, relayState);//set relay state

}

}

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So what did my code do ? Your code is full of stuff you can't justify, like the digitalWrite (9, ) , what does that DO. And why do you mess around with a little timer ? That whole timer section seems to mess up what you say you want to do.

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Your code made my esc go as forward no matter what and the relay did not work:(. The timer thing is supposed to multitask. Do you know how else to run a servo and control a servo at the same time?

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The timers are hardware, that once set, run on their own. The servo code is a good example. AFAIK PulseIn is compatible with the servo library. You aren't "multitaksing" - which the arduino can only do under pressure, you're making a measurement, and telling the hardware to get on with it, and you want that to happen as fast as you can. That's why I don't see the point of the interval code at all.

Try putting a serial print statement in, and displaying the result of PulseIn. Make sure that's working.

Define your forward and backward numbers ? Do I assume you want "90" to be "stopped", 0 full forwards and 180 full backwards ?

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Thank you very much for your help and code. I simply added "ThrottleServo.attach(9);" in the void setup and changed "ServoVal=180-ServoVal;" to 187 to make it work like a champ.

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Oops. My bad. I missed that line commented out in the original code - I automatically skip comments when I read code quickly!

Was I right about how you want the codes to run ? If I am then ServoVal = abs(ServovVal-90) should work too.

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