I just got the arduino, and basically, i'm going to make a program that controls a servo independently with a set or instructions, and reads values from a temperature sensor independently and does another action when a certain value is reached.
I'm planning to do this with one arduino, is this possible?
Thanks for the link. I kinda understand how it works. Now let's say that I wanted to take temperature readings and then control a servo motor independently.
Using this code that I got from your link, can you please give me an idea on how to place it in this code?
Thanks.
// Which pins are connected to which LED
const byte greenLED = 12;
const byte redLED = 13;
// Time periods of blinks in milliseconds (1000 to a second).
const unsigned long greenLEDinterval = 500;
const unsigned long redLEDinterval = 1000;
// Variable holding the timer value so far. One for each "Timer"
unsigned long greenLEDtimer;
unsigned long redLEDtimer;
void setup ()
{
pinMode (greenLED, OUTPUT);
pinMode (redLED, OUTPUT);
greenLEDtimer = millis ();
redLEDtimer = millis ();
} // end of setup
void toggleGreenLED ()
{
if (digitalRead (greenLED) == LOW)
digitalWrite (greenLED, HIGH);
else
digitalWrite (greenLED, LOW);
// remember when we toggled it
greenLEDtimer = millis ();
} // end of toggleGreenLED
void toggleRedLED ()
{
if (digitalRead (redLED) == LOW)
digitalWrite (redLED, HIGH);
else
digitalWrite (redLED, LOW);
// remember when we toggled it
redLEDtimer = millis ();
} // end of toggleRedLED
void loop ()
{
// Handling the blink of one LED.
if ( (millis () - greenLEDtimer) >= greenLEDinterval)
toggleGreenLED ();
// The other LED is controlled the same way. Repeat for more LEDs
if ( (millis () - redLEDtimer) >= redLEDinterval)
toggleRedLED ();
/* Other code that needs to execute goes here.
It will be called many thousand times per second because the above code
does not wait for the LED blink interval to finish. */
} // end of loop
Now let's say that I wanted to take temperature readings and then control a servo motor independently.
What does this mean. You have one computer and two jobs. How can you expect to do them independently? Doing one right after the other (read the temps; diddle with the servo; read the temps; diddle with the servo) makes sense. Doing the two tasks independently requires two Arduinos. Help me understand what independently means to you.
Maybe thermometer and servo are the independent parts?
Gin, loop() is your friend. Every time through can be 100 microseconds or less later, if your code doesn't hang things up. Inside loop() you can have a block of code that watches the sensor and the next block of code runs the servo. Each runs then loop() starts again and loop() is perpetually 'now'... but only if your code doesn't block.
Now let's say that I wanted to take temperature readings and then control a servo motor independently.
What does this mean. You have one computer and two jobs. How can you expect to do them independently? Doing one right after the other (read the temps; diddle with the servo; read the temps; diddle with the servo) makes sense. Doing the two tasks independently requires two Arduinos. Help me understand what independently means to you.
My goal is like this, for example, a person is the MCU.
He is told to do 2 things, which is first, take temperature readings, and when a certain temperature is reached, he will do an action. The second, he has to tilt a servo motor every hour. Now I want to do these things in a combined manner. What I've noticed with the arduino is that, when it has finished taking temperature readings, it moves on to the servo part of the code, and that takes an hour to finish with the delay command that is involved. Now what if the temperature was reached and it couldn't detect it since it was on the servo part of the code.
That's what i'm trying to solve.
GoForSmoke:
Maybe thermometer and servo are the independent parts?
Gin, loop() is your friend. Every time through can be 100 microseconds or less later, if your code doesn't hang things up. Inside loop() you can have a block of code that watches the sensor and the next block of code runs the servo. Each runs then loop() starts again and loop() is perpetually 'now'... but only if your code doesn't block.
So, after the void setup (), then the void loop (), i put another loop () and write my code in between?
after the void setup (), then the void loop (), i put another loop ()
No, you can't have two "loop"s.
You could write "loop1" and "loop2", and call them one after the other inside "loop"
Thanks for your reply.
Okay, now about the delay part, it would follow the sequence of the code on which action would be first? As the program runs by your suggestion, let's say for example, the servo control is on loop1 with a delay of let's say, 1 hour, then the thermometer is on loop2. Would the Arduino perform the 2 tasks independently?