I want to bring 3 sensor variables that change all the time to my python interface.
I am trying with this test code, it does not work, what am I doing wrong?
Arduino:
void setup() {
Serial.begin (9600);
}
void loop() {
Serial.print(random(1,3));
Serial.print(random(3,5));
Serial.print(random(5,7));
}
Python:
canvas.create_text(190, 150, text=ser.readline(1), fill="gray", font="Helvetica 45 bold",tag="T1")
How can I get multiple variables updating all the time? right now I am just getting the first one, and it is not updating
Why are you using the readline function to read just one byte? Since you want multiple values, separate the variables with (for instance) a space, then use readline to store them all and split to separate them:
PS: note that the last one is actually a println
Arduino:
void loop() {
Serial.print(random(1,3));
Serial.print(" ");
Serial.print(random(3,5));
Serial.print(" ");
Serial.println(random(5,7));
}
Python:
allitems=ser.readline()
separateditems=allitems.split();
canvas.create_text(190, 150, " - ".join(separateditems), fill="gray", font="Helvetica 45 bold",tag="T1")
In this example I put the items in the separateditems list (so separateditems[0] is equal to random(1,3), separateditems[1] is equal to random(3,5) and separateditems[2] is equal to random(5,7)). Then I joined them to display "random(1,3) - random(3,5) - random(5,7)". Anyway you can do whatever you want with the collected data.
Then I HIGHLY suggest you to put a delay inside the loop, to avoid sending too many data. I suggest putting a delay(100); at the end or, if you need to do other things while waiting, see the "Bounce without delay" example.
