Need help interfacing with Arduino ultrasonic sensor

@loricolbert wrote:

I’m trying to replicate this project:
Ultrasonic Sensor in OpenFrameworks Using Arduino : 4 Steps - Instructables

I’ve got the arduino wired and I’m pretty sure its code is running properly.

I’ve got openFrameworks running inside Visual Studio 2017 and I’ve got the following code built/compiled, but when I run it, instead of getting a running output of "cm: " followed by a reading from the ultrasonic sensor, I get these two errors instead:

[ error ] ofSerial: available(): serial not inited
[ error ] ofTrueTypeFont: drawString(): font not allocated

Here’s the code I have in oF…I’m a total beginner, so I’m just trying to copy the code from the Instructables, but something isn’t working and I don’t really understand how the code works at all, so I appreciate any help you can give.

main.cpp

#include “ofMain.h”
#include “ofApp.h”

//========================================================================
int main( ){
ofSetupOpenGL(500,200,OF_WINDOW); // <-------- setup the GL context

// this kicks off the running of my app
// can be OF_WINDOW or OF_FULLSCREEN
// pass in width and height too:
ofRunApp(new ofApp());

}

ofApp.h

#pragma once

#include “ofMain.h”

class ofApp : public ofBaseApp {

public:
//Standard oF functions.
void setup();
void update();
void draw();

void keyPressed(int key);
void keyReleased(int key);
void mouseMoved(int x, int y);
void mouseDragged(int x, int y, int button);
void mousePressed(int x, int y, int button);
void mouseReleased(int x, int y, int button);
void mouseEntered(int x, int y);
void mouseExited(int x, int y);
void windowResized(int w, int h);
void dragEvent(ofDragInfo dragInfo);
void gotMessage(ofMessage msg);

//Custom variables for on screen string and font.
string msg;
ofTrueTypeFont font;

//New serial object.
ofSerial serial;

};

ofApp.cpp

#include “ofApp.h”
//int for storing the byte data from Arduino.
int byteData;
//--------------------------------------------------------------
void ofApp::setup() {
//General setup of look of window.
ofBackground(255);
font.load(“verdana.ttf”, 64);
ofSetColor(0);

//serial port setup. using COM3 for Windows port.
//Also using baud rate 9600, same in Arduino sketch.
serial.setup("COM3", 9600);

font.drawString("test1", 50, 100);

}

//--------------------------------------------------------------
void ofApp::update() {

//Simple if statement to inform user if Arduino is sending serial messages. 
if (serial.available() < 0) {
	msg = "Arduino Error";
}
else {
	//While statement looping through serial messages when serial is being provided.
	while (serial.available() > 0) {

		//byte data is being writen into byteData as int.
		byteData = serial.readByte();

		//byteData is converted into a string for drawing later.
		msg = "cm: " + ofToString(byteData);
	}

}

}

//--------------------------------------------------------------
void ofApp::draw() {
//drawing the string version pf byteData on oF window.
font.drawString(msg, 50, 100);

//printing byteData into console.
cout << byteData << endl;

}

//--------------------------------------------------------------
void ofApp::keyPressed(int key) {

}

//--------------------------------------------------------------
void ofApp::keyReleased(int key) {

}

//--------------------------------------------------------------
void ofApp::mouseMoved(int x, int y) {

}

//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button) {

}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button) {

}

//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button) {

}

//--------------------------------------------------------------
void ofApp::mouseEntered(int x, int y) {

}

//--------------------------------------------------------------
void ofApp::mouseExited(int x, int y) {

}

//--------------------------------------------------------------
void ofApp::windowResized(int w, int h) {

}

//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg) {

}

//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo) {

}

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