building my first simple robot....the problem is , I can't get the many versions of code i tried to work right...I am using continous rotation servo's...if i run code, it just keeps on running and won't stop or change its direction...i googled and tried code from everywhere...how do i stop,reverse and forward with these continous rotation servos, without buying a external shield....or is it that a arduino can't do it?
put all your code in setup() and it will stop after executing it once.
If you need a more elaborate advice you could post your code...
how do i stop,reverse and forward with these continous rotation servos, without buying a external shield....or is it that a arduino can't do it?
By using the servo commands correctly. You will have to post your code for us to help you with this.
Lefty
ok, here's the code.....its supposed to rotate for 1 360 degree turn , then pause for 10 seconds and start the loop over
#include <Servo.h>
Servo servo1;
int pos;
int x;
void setup()
{
servo1.attach(9);
}
void loop() {
pos = 0; // use 0 for forward,90 for stop,180 for reverse
for(x=0; x<361; x++)
{
servo1.writeMicroseconds(pos); // servo forward
delay(15);
}
delay(10000);
}
Also your program will have no way to know when the servo has completed turning a single 360 degrees as there is no feedback signal to test. A modified servo can only go forward/reverse/stop, there is no way to say go 360 degrees and then stop. You might be able to manually time the speed of the servo (learn it's RPM) and use a delay equal to that measurement, but as it's also a variable speed modified servo it may well be difficult to get any kind of accuracy using that method.
Servos modified for continous and bidirection variable speed is kind of a limited device to work with. I'm always amazed that so many newcomers buy them first rather then working with standard unmodified servos first. I suspect that far too many of them pick them because they think they are getting an 'extra' feature without realizing that they are giving up a equally or even more important feature, position control.
Lefty
Some simple servo test code you can use to see how your servo works.
// zoomkat 10-4-10 serial servo test
// type servo position 0 to 180 in serial monitor
// for writeMicroseconds, use a value like 1500
// for IDE 0019 and later
// Powering a servo from the arduino usually DOES NOT WORK.
String readString;
#include <Servo.h>
Servo myservo; // create servo object to control a servo
void setup() {
Serial.begin(9600);
myservo.writeMicroseconds(2000); //set initial servo position if desired
myservo.attach(7); //the pin for the servo control
Serial.println("servo-test-21"); // so I can keep track of what is loaded
}
void loop() {
while (Serial.available()) {
delay(1);
if (Serial.available() >0) {
char c = Serial.read(); //gets one byte from serial buffer
readString += c; //makes the string readString
}
}
if (readString.length() >0) {
Serial.println(readString); //so you can see the captured string
int n;
char carray[6]; //converting string to number
readString.toCharArray(carray, sizeof(carray));
n = atoi(carray);
myservo.writeMicroseconds(n); // for microseconds
//myservo.write(n); //for degees 0-180
readString="";
}
}
x is just a do nothing for loop.......if the servo is at 0, the motor should turn over and over again....but it turns then stops after a while.....i already know how to control a stardard sevo......i can run the code just to turn the servo at 0 position , but if i use the 180 position it should reverse and if i use 90 it should stop....but none of this works....in PBASIC for the basic stamp a simple PULSOUT 9,0 does the trick....maybe the arduino can't do it
Zoomcat your code rotated the servo for a while then stopped...just like my code
guess i'll have to dust off my old basic stamp2 and use it for a robot...don't think the arduino can handle continous rotation on a servo...or just use a DC motor with a h-bridge with the arduino board
@KE7GKP...it works with a basic stamp....i want it to run continous until i tell it to stop or backup if a object is detected with infrared detector.....the servo is fine, it works....its just the arduino can't do a pulsout command like the stamp can
look ..all i want to do is, run the servo forward continous...if object is detected, then stop, then back up and turn and run again
its simple to do in PBASIC...but I can't do it in C...it shouldn't be that hard
oldPGMguy:
@KE7GKP...it works with a basic stamp....i want it to run continous until i tell it to stop or backup if a object is detected with infrared detector.....the servo is fine, it works....its just the arduino can't do a pulsout command like the stamp can
If a basic stamp can make the servo do what you wish, then a arduino most certainly can. Your problem is that you have not yet figured out how to translate a basic program (used in your stamp) to a valid c/c++ language (used by the arduino). So bottom line it can, but you can't (as of yet). Possibly if you can post the basic stamp program here we/someone can help you with the conversion required.
Lefty
thanks lefty..hers what i want to do....maybe i am saying it wrong...ok here is a PBASIC program
'BS2 Robot Demo
'By oldELECTROguy
'Shows How To Use BS2 For Robotic Use
'Cyles Servos and Bumper Switches
'----------------------------- Constants --------------------------------------------
dirs=%11111111 ' Make all I/O Pins Output
Mstop Con 150 ' Brake Servo
MfFor Con 200 ' Run Servo Foward Fast
MsFor Con 160 ' Run Servo Forward Slow
MfRev Con 80 ' Run Servo Reverse Fast
MsRev Con 140 ' Run Servo Reverse Slow
VOn Con 2 ' Enable Talk (For Talk Chip - ISD1110P
VOff Con 3 ' Disable Talk
SDelay Con 15 ' 10 millisecond delay for Servo
'------------------------------Variables----------------------------------------------
RBump Var Bit 'Sensor 1=OK 0=Touched Something
LBump Var Bit 'Bit = 0 to 1
X Var Byte 'X = 0 to 255
Y Var Nib 'Y = 0 to 15
Z Var Word 'Z = 0 to 65535
'-------------------------------MAIN LOOP---------------------------------------------
again:
gosub forward
gosub Fslow
gosub Back
gosub BackS
gosub Brake
gosub Soundme
goto again
'------------------------------SUB ROUTINES-------------------------------------------
forward:
debug "Forward",cr
for x=1 to 200
pulsout 0,mffor
pulsout 1,mffor
pause sdelay
next
return
Fslow:
debug "Forward Slow",cr
for x=1 to 200
pulsout 0,msfor
pulsout 1,msfor
pause sdelay
next
return
Back:
debug "Reverse",cr
for x=1 to 200
pulsout 0,mfrev
pulsout 1,mfrev
pause sdelay
next
return
BackS:
debug "Reverse Slow",cr
for x=1 to 200
pulsout 0,msrev
pulsout 1,msrev
pause sdelay
next
return
Brake:
debug "Brake",cr
for z=1 to 1000
pulsout 0,mStop
pulsout 1,mStop
pause sdelay
next
return
SOUNDME:
debug "Danger Will Robinson",cr
freqout 7,1500,1000,1200
pause 5
freqout 7,1000,1200,1800
pause 5
return
@KE7GKP the servo works, i just tested it with a basic stamp...it runs forward, stops when i tell it, and reverses when i tell it
@KE7GKP....it works both the analog and digital ports....i used all the code i could find...it just doesn't work right...just give me one piece of code that can rotate the servo for atleast 10 seconds and stop then start again
don't think the arduino can handle continous rotation on a servo.
Sure it does. You just need to understand how they work. I have two continous rotation servos and my code controls them without issue. Often people have issues with their servos due to inadequate power supplies. How is your servo powered? Below is a recomended setup using an external power supply.
Ok here are the key things to utilise from your basic program to arudino code:
Stamp uses:
SDelay Con 15 ' 10 millisecond delay for Servo
Mstop Con 150 ' Brake Servo
MfFor Con 200 ' Run Servo Foward Fast
MsFor Con 160 ' Run Servo Forward Slow
MfRev Con 80 ' Run Servo Reverse Fast
MsRev Con 140 ' Run Servo Reverse SlowArduino would use:
#define Mstop 1500 // Brake Servo
#define MfFor 2000 // Run Servo Foward Fast
#define MsFor 1600 // Run Servo Forward Slow
#define MfRev 800 // Run Servo Reverse Fast
#define MsRev 1400 // Run Servo Reverse Slow
#define SDelay 2000 // 2 second delay for ServoAnd where your stamp program uses:
forward:
debug "Forward",cr
for x=1 to 200
pulsout 0,mffor
pulsout 1,mffor
pause sdelay
next
return// and
Brake:
debug "Brake",cr
for z=1 to 1000
pulsout 0,mStop
pulsout 1,mStop
pause sdelay
next
returnyour arduino code would use:
void forward(void)
{
Serial.println("Forward");
myservo.writeMicroseconds(MfFor);
delay(SDelay); // delay for 2 secs
}// and
void Brake(void)
{
Serial.println("Break");
myservo.writeMicroseconds(Mstop);
delay(SDelay * 5); //delay for 10 sec
}
Certainly not a complete sketch, and probably not the best use of the C syntex, but it's more to show a simple conversion from basic to C equivelent. It shows the critical servo statment and constant values to duplicate what your basic stamp program uses. Hope that's enough to get you headed in the right direction. Now after having to read a basic program I feel kind of dirty and need to go take a shower. 
Lefty
thanks RETROLEFTY
here is the code i came up with as a test it works.......
#include <Servo.h>
Servo myservo;
int pos;
int x;
void forward(){
pos = 2000; // use 1000 or 2000 for forward or backward
myservo.writeMicroseconds(pos); // servo forward
delay(15);
}
void reverse(){
pos = 1000; // use 1000 or 2000 for forward or backward
myservo.writeMicroseconds(pos); // servo forward
delay(15);
}
void servoStop(){
pos = 1500; // use 1000 or 2000 for forward or backward
myservo.writeMicroseconds(pos); // servo forward
delay(15);
}
void setup()
{
myservo.attach(9);
}
void loop() {
for(x=0; x<1000; x++){
forward(); }
for(x=0; x<1000; x++){
servoStop(); }
for(x=0; x<1000; x++){
reverse(); }
}
here is the code i came up with as a test it works.......
Great, you got the idea. The arduino servo library code is automatically handling (and hiding from you) a lot of the stuff that the stamp code had to deal with.
See we can help you 'unlearn' all that nasty BASIC stuff and help you on the journey to learning a real programming language. 
Lefty
Hey..i want to learn C....RetroLefty.....thanks to all...for the help