ok i modified the hs311 into a continuous rotation servo but still am not having any luck with making it turn in any direction other than left

i will see if i have one of those in my parts box but if that still doesnt work how would i get that servo to do more than turn to the left?

Yes i was measuring the voltage when the servo was powered up and yes a voltage divider as in two resistors

i was using an e-flite 7.4 volt lipo with a voltage divider down to 4.8 volts

Update: I managed to get the servo to move slightly to the right but the movements are very twitchy and the servo constantly twitches

so i bought a HS 311 to use for the swivel mount for my ping sensor but for some odd reason the servo only turns left. I have been googling this problem since last night and really havent found an easy solution besides people saying buy another servo.

Code:

/*MAEP 2.0 Navigation
by Noah Moroze, aka GeneralGeek
This code has been released under a Attribution-NonCommercial-ShareAlike license, more info at http://creativecommons.org/licenses/
PING))) code by David A. Mellis and Tom Igoe http://www.arduino.cc/en/Tutorial/Ping
Edited by: Jason Miller for Project KITT
*/

#include <Servo.h> //include Servo library
#include <LiquidCrystal.h> //include lcd library

LiquidCrystal lcd(2, 3, 6, 7, 8, 9);

const int RForward = 0;
const int RBackward = 180;
const int LForward = RBackward;
const int LBackward = RForward;
const int RNeutral = 90;
const int LNeutral = 90; //constants for motor speed
const int pingPin = 4;
const int dangerThresh = 5; //threshold for obstacles (in inches)
int leftDistance, rightDistance; //distances on either side
Servo panMotor; 
Servo leftMotor;
Servo rightMotor; //declare motors
long duration; //time it takes to recieve PING))) signal

void setup()
{
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.print("Hello Jason");
  delay(1000);
  lcd.clear();
  lcd.print("Activating KITT");
  delay(1000);
  lcd.clear();
  lcd.print("KITT Online");
  delay(1000);
  rightMotor.attach(11);
  leftMotor.attach(10);
  panMotor.attach(5); //attach motors to proper pins
  panMotor.write(90); //set PING))) pan to center
}

void loop()
{
  int distanceFwd = ping();
  if (distanceFwd>dangerThresh) //if path is clear
  {
    leftMotor.write(LForward);
    rightMotor.write(RForward); //move forward
    lcd.print("Forward");
  }
  else //if path is blocked
  {
    leftMotor.write(LNeutral);
    rightMotor.write(RNeutral);
    panMotor.write(0);
    delay(500);
    rightDistance = ping(); //scan to the right
    lcd.print("Scan Right");
    delay(500);
    panMotor.write(180);
    delay(700);
    leftDistance = ping(); //scan to the left
    lcd.print("Scan Left");
    delay(500);
    panMotor.write(90); //return to center
    delay(100);
    compareDistance();
  }
}
 
void compareDistance()
{
  if (leftDistance>rightDistance) //if left is less obstructed
  {
    leftMotor.write(LBackward);
    rightMotor.write(RForward); //turn left
    lcd.print("Turn Left");
    delay(500);
  }
  else if (rightDistance>leftDistance) //if right is less obstructed
  {
    leftMotor.write(LForward);
    rightMotor.write(RBackward); //turn right
    lcd.print("Turn Right");
    delay(500);
  }
   else //if they are equally obstructed
  {
    leftMotor.write(LForward);
    rightMotor.write(RBackward); //turn 180 degrees
    lcd.print("Turn 180");
    delay(500);
  }
}

long ping()
{
  // Send out PING))) signal pulse
  long duration, inches;
  pinMode(pingPin, OUTPUT);
  digitalWrite(pingPin, LOW);
  delayMicroseconds(2);
  digitalWrite(pingPin, HIGH);
  delayMicroseconds(5);
  digitalWrite(pingPin, LOW);
 
  //Get duration it takes to receive echo
  pinMode(pingPin, INPUT);
  duration = pulseIn(pingPin, HIGH);
  inches = microsecondsToInches(duration);
  lcd.print(inches);
  lcd.print("in to obstacle");
  delay(100);
  lcd.clear(); 
  delay(100);
}
 
  long microsecondsToInches(long microseconds)
  {
  return duration / 29 / 2;
}
 

ok so i took out the data logging and just stuck with the ping and lcd now i just need a little help with getting the statements set up so my robot can avoid obstacles once ii can get my servos installed when they arrive

Code:

#include <LiquidCrystal.h>

LiquidCrystal lcd(2, 3, 6, 7, 8, 9);
const int pingPin = 4;


void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.print("Hello Jason");
  delay(1000);
  lcd.clear();
  lcd.print("Activating KITT");
  delay(1000);
}


void loop()
{
  long duration, inches;
  pinMode(pingPin, OUTPUT);
  digitalWrite(pingPin, LOW);
  delayMicroseconds(2);
  digitalWrite(pingPin, HIGH);
  delayMicroseconds(5);
  digitalWrite(pingPin, LOW);
  pinMode(pingPin, INPUT);
  duration = pulseIn(pingPin, HIGH);
  inches = microsecondsToInches(duration);

  lcd.print(inches);
  lcd.print("in to obstacle");
  delay(100);
  lcd.clear(); 
  delay(100);
}
long microsecondsToInches(long microseconds)
{
  return microseconds / 74 / 2;
}

yeah i know so im thinking of just scrapping the whole data logging part until i can learn the code for it better

i tripled checked all the wiring and had it working from setup and now all i have is a blinking cursor. since this will not be connected to a computer it needs to have the lcd screen displaying exactly the same information that its data logging

ok i kinda got it working but now all my lcd screen shows is a blinking cursor and no messages

Code:

#include <SPI.h>
#include <SD.h>
#include <LiquidCrystal.h>

LiquidCrystal lcd(3, 5, 6, 7, 8, 9);
const int chipSelect = 4;
const int pingPin = 2;
File dataFile;

void setup() {
  lcd.begin(16, 2);
  Serial.begin(9600);
  lcd.print("Initializing SD card...");
  pinMode(10, OUTPUT);
  delay(250);
  lcd.clear();
  delay(250);
  if (!SD.begin(chipSelect)) {
    lcd.println("Card failed.");
    // don't do anything more:
    return;
  }
  lcd.println("card initialized.");
}


void loop() {
  lcd.clear();
    long duration, inches, cm;
  pinMode(pingPin, OUTPUT);
  String dataString = "";
  int sensor =0;

  digitalWrite(pingPin, LOW);
  delayMicroseconds(2);
  digitalWrite(pingPin, HIGH);
  delayMicroseconds(5);
  digitalWrite(pingPin, LOW);
  pinMode(pingPin, INPUT);
  duration = pulseIn(pingPin, HIGH);


  sensor = digitalRead(pingPin);
  dataString += String(sensor);
  dataFile = SD.open("datalog.txt", FILE_WRITE);

  inches = microsecondsToInches(duration);
  cm = microsecondsToCentimeters(duration);
  dataFile = SD.open("datalog.txt", FILE_WRITE);
  if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
    Serial.println(dataString);
  }//if
  else {
    Serial.println("error opening datalog.txt");
  }//else

  Serial.print(inches);
  lcd.print("in, ");
  Serial.print(cm);
  lcd.print("cm");

  delay(100);
}
long microsecondsToInches(long microseconds)
{
  return (microseconds / 74 ) / 2;
}//microsecondsToInches


long microsecondsToCentimeters(long microseconds)
{
  return (microseconds / 29) / 2;
}//microsecondsToCentimeters

thank you for pointing that out for me

i wound up scrapping that code nd starting over but im still getting errors so here is the new code

Code:

#include <SPI.h>
#include <SD.h>
#include <LiquidCrystal.h>

LiquidCrystal lcd(3, 5, 6, 7, 8, 9);
const int chipSelect = 4;
const int pingPin = 2;

void setup() {
  lcd.begin(16, 2);
  Serial.begin(9600);
  lcd.print("Initializing SD card...");
  pinMode(10, OUTPUT);
  delay(250);
  lcd.clear();
  delay(250);
  if (!SD.begin(chipSelect)) {
    lcd.println("Card failed.");
    // don't do anything more:
    return;
  }
  lcd.println("card initialized.");
  }


void loop() {
  String dataString = "";
    int sensor = digitalRead(pingPin);
    dataString += String(sensor);
}
File dataFile = SD.open("datalog.txt", FILE_WRITE);
    if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
    // print to the serial port too:
    Serial.println(dataString);
    }
    else {
    lcd.println("error opening datalog.txt");
    }
}
}

and here are the errors

sketch_mar21b:32: error: expected unqualified-id before 'if'
sketch_mar21b:38: error: expected unqualified-id before 'else'
sketch_mar21b:41: error: expected declaration before '}' token

and once again i do appologize for my poor coding skills i missed alot of programming labs due to a car accident last month

i have 2 force sensors to add to this and 2 continuous rotation servos once i get everything figured out.. the lcd screen is supposed to display the messages about the card slot as well as displaying distance from the ping sensor

ok here is my new code but my lcd screen is not working and i have tested the screen by itself and it does work but for some reason not with my code can any one show me what mistakes im making?

Code:

#include <SPI.h>
#include <SD.h>

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define OLED_DC 4
#define OLED_CS 6
#define OLED_CLK 5
#define OLED_MOSI 3
#define OLED_RESET 13
Adafruit_SSD1306 display(OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

const int chipSelect = 10;
const int pingPin = 7;

void setup()
{
  Serial.begin(9600);
  display.begin(SSD1306_SWITCHCAPVCC);
  display.display();
  delay(2000);
  display.clearDisplay();
  display.print("Initializing SD card...");
  pinMode(10, OUTPUT);
  if (!SD.begin(chipSelect))
  {
    display.println("Card failed, or not present");
    return;
  }
  display.println("card initialized.");

}

void loop()
{
  long duration, inches, cm;
  pinMode(pingPin, OUTPUT);
  digitalWrite(pingPin, LOW);
  delayMicroseconds(2);
  digitalWrite(pingPin, HIGH);
  delayMicroseconds(5);
  digitalWrite(pingPin, LOW);
  pinMode(pingPin, INPUT);
  duration = pulseIn(pingPin, HIGH);
  inches = microsecondsToInches(duration);
  cm = microsecondsToCentimeters(duration);
  Serial.print(inches);
  display.print("in, ");
  Serial.print(cm);
  display.print("cm");
  Serial.println();

  delay(100);

  String dataString = "";

    int sensor = digitalRead(pingPin);
    dataString += String(sensor);
    if (pingPin < 2)
    {
      dataString += ",";
    }
 
  File dataFile = SD.open("datalog.txt", FILE_WRITE);
  if (dataFile)
  {
    dataFile.println(dataString);
    dataFile.close();
    Serial.println(dataString);
  }
  else
  {
    display.println("error opening datalog.txt");
  }
}

long microsecondsToInches(long microseconds)
{
  return microseconds / 74 / 2;
}
long microsecondsToCentimeters(long microseconds)
{
  return microseconds / 29 / 2;
}

i was trying to use the code from the ping sample along with the code for the datalogger and lcd screen since im still fairly new to arduino