Hi,
... and sorry for bothering you with another beginner question...
My actual project is very simple.
I use one of those starter sets from amazon to make this.
I have modified "Lesson 5 Digital Inputs"
The Setup looks like this "Schaltplan LED.PNG"
Since Interrupts work only at Port 2 and 3 I conected the switches there.
Most of the sketch is the same as the one in the lesseion (where everything works fine)
I do need to get in touch with interrupts, because I want to integrate something like an emergency-stop button. (for a later more complicated sketch)
So what I want this sketch to do is wait ... until the first button is pressed.
This set x to 3 and the while loop makes the LED blink 3 times
In case of an "emergency" the sceond button is pressed and the value x should be set to 0 which ends the loop and everything is stopped.
Until the first button is pressed again setting x to 3... and so on
Not too complicated, but it doesn't work the way I did it.
Any ideas, wherer is missed the important part ?
Thanx
Not too complicated, but it doesn't work the way I did it.
Please explain what it does instead.
Code, posted properly (see the "How to use this forum" post).
int ledPin = 5;
int buttonApin = 2;
int buttonBpin = 3;
volatile int x = 5;
void setup()
{
Serial.begin(9600);
pinMode(ledPin, OUTPUT);
pinMode(buttonApin, INPUT_PULLUP);
pinMode(buttonBpin, INPUT_PULLUP);
attachInterrupt(buttonApin, functionSTART, LOW);
attachInterrupt(buttonBpin, functionSTOP, LOW);
}
void loop()
{
while (x > 0) {
digitalWrite(ledPin, HIGH);
delay(250);
digitalWrite(ledPin, LOW);
delay(250);
x--;
}
}
void functionSTART() {
x = 3;
}
void functionSTOP() {
x = 0;
}
If you are really using a breadboard in exactly the manner shown in the posted diagram, use your multimeter to verify that the switches are connected to Arduino GND when closed. Some breadboards have no connection across the horizontal gap.
attachInterrupt(pin, ISR, mode) (Not recommended. Additionally, this syntax only works on Arduino SAMD Boards, Uno WiFi Rev2, Due, and 101.)
The syntax you're using in your attachInterrupt calls doesn't work on your Uno and is not recommended no matter which board you're using. You need to use this syntax:
Do NOT use the LOW and HIGH interrupt modes! They will tie up the processor for the ENTIRE time the input pin is LOW or HIGH. Use CHANGE, FALLING or RISING modes only.
And make 'x' (which could use a better name btw) to a byte. Or, if you want the option to make it >255, disable interrupts while reading or writing from/to it from the normal program.
If you are using a Uno as in your attachment then check the syntax for the attachInterrupt() function
What is the first parameter ?
HINT : it is not a pin number
?