Arduino does not supports threading. However, you can do the next best thing and structure your code around state machines running in interleaving.
While there are lots of ways to implement your tasks as state machines, I recommend this library (https://github.com/Elidio/StateMachine). This library abstracts most of the process.
You can create a state machine as a class like this:
#include "StateMachine.h"
class STATEMACHINE(Blink) {
private:
int port;
int waitTime;
CREATE_STATE(low);
CREATE_STATE(high);
void low() {
digitalWrite(port, LOW);
*this << &STATE(high)<< waitTime;
}
void high() {
digitalWrite(port, HIGH);
*this << &STATE(low)<< waitTime;
}
public:
Blink(int port = 0, int waitTime = 0) :
port(port),
waitTime(waitTime),
INIT_STATE(low),
INIT_STATE(high)
{
pinMode(port, OUTPUT);
*this << &STATE(low);
}
};
The macro STATEMACHINE()
abstracts the class inheritances, the macro CREATE_STATE()
abstracts the state wrapper creation, the macro INIT_STATE()
abstracts method wrapping and the macro STATE()
abstracts state wrapper reference within the state machine class.
State transition is abstracted by <<
operator between the state machine class and the state, and if you want a delayed state transition, all you have to do is to use that operator with an integer, where the integer is the delay in millisseconds.
To use the state machine, first you have to instantiate it. Declaring an reference to the class in global space while instantiating it with new
on setup function might do the trick
Blink *led1, *led2, *led3;
void setup() {
led1 = new Blink(12, 300);
led2 = new Blink(11, 500);
led3 = new Blink(10, 700);
}
Then you run the states on loop.
void loop() {
(*led2)();
(*led1)();
(*led3)();
}