Compile error : 'OUTPUT' was not declared in this scope

Using Arduino Programming Questions
1

void AFMotorController::enable(void) {
// setup the latch
/*
LATCH_DDR |= _BV(LATCH);
ENABLE_DDR |= _BV(ENABLE);
CLK_DDR |= _BV(CLK);
SER_DDR |= _BV(SER);
*/
pinMode(MOTORLATCH, OUTPUT);
pinMode(MOTORENABLE, OUTPUT);
pinMode(MOTORDATA, OUTPUT);
pinMode(MOTORCLK, OUTPUT);

latch_state = 0;

latch_tx(); // "reset"

//ENABLE_PORT &= ~_BV(ENABLE); // enable the chip outputs!
digitalWrite(MOTORENABLE, LOW);
}

Did I include enough code? I am using an Arduino for the first time. I bought a book that described how to build Linus, a line-following robot. The robot is built and I tried to download and compile the code but I get this error message. The line "pinMode {MOTORLATCH, OUTPUT}; line is highlighted. The site for the code is

I figured out how to include AFMotor.cpp and AFMotor.h in the sketch, I think. They are visible from tabs in the same window of my sketch. What am I doing wrong? Thanks!!

2

If you are using arduino 1.0, you need to change:
#import <WProgram.h>
To:
#import <Arduino.h>

There is one such change required at the top of the AFMotor.cpp file.

3

I figured it out. In addition to updating that line, I hab the libraries in the wrong place. Thank you so much!! One more question, though. This robot uses an IR emitter / detector pair to sense a black line, but it's "quirky" and veers way off and then tried to correct itself. I tried to view the sensors output in the serial monitor to better calibrate it, but the data stream is far too fast to read. Am I doing it wrong?

4

rocketman247:
I figured it out. In addition to updating that line, I hab the libraries in the wrong place. Thank you so much!! One more question, though. This robot uses an IR emitter / detector pair to sense a black line, but it's "quirky" and veers way off and then tried to correct itself. I tried to view the sensors output in the serial monitor to better calibrate it, but the data stream is far too fast to read. Am I doing it wrong?

void show_graph(int data) {
  for (int i=0; i<data; i+=50) { // Tune the 50
    Serial.print('=');
  }
  Serial.print('|');
  Serial.print(data);
  Serial.println();
}

void setup() {
    Serial.begin(115200);
}

void loop() {
    int ain = analogRead(A0);
    show_graph(ain);
    // no delay
}
5

WizenedEE:

rocketman247:
I figured it out. In addition to updating that line, I hab the libraries in the wrong place. Thank you so much!! One more question, though. This robot uses an IR emitter / detector pair to sense a black line, but it's "quirky" and veers way off and then tried to correct itself. I tried to view the sensors output in the serial monitor to better calibrate it, but the data stream is far too fast to read. Am I doing it wrong?

void show_graph(int data) {

for (int i=0; i<data; i+=50) { // Tune the 50
    Serial.print('=');
  }
  Serial.print('|');
  Serial.print(data);
  Serial.println();
}

void setup() {
    Serial.begin(115200);
}

void loop() {
    int ain = analogRead(A0);
    show_graph(ain);
    // no delay
}

Thanks so much, but I'm gonna show my utter ignorance here.... Where does this go? In place of my current Serial.print codes? Or is it an add on?

6

Well you could try using the show_graph function instead of Serial.print

Depending on several factors, you might also want to write a quick program on your PC to read the serial port and make the graph for you. That would make the serial communication be about ten times faster than that show_graph function.

7

If you are using Arduino 1.0 and newer, you should do this at the top of the .cpp file, so it is compatible with more versions of the IDE:

#if ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif

@TCWORLD: What is the difference between #import and #include? Isn't #include more often used? I never seen #import before.

8

dkl65:
@TCWORLD: What is the difference between #import and #include? Isn't #include more often used? I never seen #import before.

import is often used in other programming languages like python and java. It's easy to mix them up.

Aparently, #import was a gcc extension, but it's depreciated now. Use #include.

9

Where does this go?

How can we tell you if you never posted ALl your code.

10

Sorry about that, i meant #include. I have been doing quite a bit of Objective-C stuff for an iPhone of late, and they use #import.