Hey, I am trying to make a motor respond to Serial command. I want the user to stop the motor by typing "Stop". Start the motor with "Start". Switch rotation with "Switch" and adjust the speed by giving a value from 1 to 255.
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while trying to stop the motor when it enters the if statement a problem occurred. Problem is it won't enter the if. I had my friend try it in Java, same code, worked.
I wonder if the strings exceed the SRAM.
I am thinking about using switch with cases for each command.
I want to take the number out of a string and then applying it to the motor. (since the speed value will arrive as a string.
This is the code where the problem is
String stopCommand = "Stop";
void setup() {
Serial.begin(9600);
}
void loop() {
while(Serial.available() > 0 ) {
String command = Serial.readString();
Serial.println(command); //it prints "Stop" here telling me that command is "Stop"
if (command.equalsIgnoreCase(stopCommand)){ // yet this does not work
Serial.println("I am here"); //and "I am here" does not print
}
Serial.println(command); //still prints "Stop" here telling me that command is still "Stop"
}
}
Here is the full code my code will run with.
const int controlPin1 = 2;
const int controlPin2 = 3;
const int enablePin = 9;
const int directionSwitchPin = 4;
const int onOfSwitchStateSwitchPin = 5;
const int potPin = A0;
int onOfSwitchState = 0;
int previousOnOfSwitchState = 0;
int directionSwitchState = 0;
int previousDirectionSwitchState = 0;
int motorEnabled = 0;
int motorSpeed = 0;
int motorDirection = 1;
String stopCommand = "Stop";
void setup(){
pinMode(directionSwitchPin, INPUT);
pinMode(onOfSwitchStateSwitchPin, INPUT);
pinMode(controlPin1, OUTPUT);
pinMode(controlPin2, OUTPUT);
pinMode(enablePin, OUTPUT);
digitalWrite(enablePin, LOW);
Serial.begin(9600);
}
void loop(){
takeCommand(); //here is my function where the problem is atm.
onOfSwitchState = digitalRead(onOfSwitchStateSwitchPin);
delay(1);
directionSwitchState = digitalRead(directionSwitchPin);
motorSpeed = analogRead(potPin)/4;
if(onOfSwitchState != previousOnOfSwitchState){
if(onOfSwitchState == HIGH){
motorEnabled = !motorEnabled;
}
}
if (directionSwitchState != previousDirectionSwitchState) {
if (directionSwitchState == HIGH) {
motorDirection = !motorDirection;
}
}
if (motorDirection == 1) {
digitalWrite(controlPin1, HIGH);
digitalWrite(controlPin2, LOW);
}
else {
digitalWrite(controlPin1, LOW);
digitalWrite(controlPin2, HIGH);
}
if (motorEnabled == 1) {
analogWrite(enablePin, motorSpeed);
}
else {
analogWrite(enablePin, 0);
}
previousDirectionSwitchState = directionSwitchState;
previousOnOfSwitchState = onOfSwitchState;
}
void takeCommand ()//determins recived command
{
while(Serial.available() > 0 ) {
String command = Serial.readString();
Serial.println(command);
if (command.equalsIgnoreCase(stopCommand)){
Serial.println("I am here");
}
Serial.println(command);
}
}
that worked. Now, this is part of a assignment and the tutor will probably not change from newline to none. Is there a way to make it work with newline? I tried changing stopCommand string to "Stop/n". Yet when I typed "Stop" into Serial it did not print "I am here" but printed the "Stop" with a newline inbetween. (want to add a picture to show, but don't know how to add a jpg)