Want the numbers in between two limits with equal time interval - arduino

Question

I try to get values in between 10 and 100 so I arrange
int pos;
long previousTime =0;
int increment = 1;
int interval = 10;
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
}
void loop() {
long currentTime = millis();
if(currentTime - previousTime > interval){
previousTime = currentTime;
pos +=increment;
if(pos<= 10 || pos > 100){
increment = -increment;
}
Serial.println(pos);
}
}
But my output showing only 1 and 0.If I reduce lower limit into 0 or 1 then I got values in between those limit values given inside the if statement but not getting proper result when I increase the lower limit.Why?

Answer 1

Ok your problem is simple now that we can see the whole code. Look at position, it starts out at 0. On the first pass through loop it gets increments to 1. Then that if statement checks and 1 is indeed less than 10 so it makes increment -1. Then on the next pass through loop that gets added making pos 0 again and since 0 is less than 10 it reverses increment again. It’s doing exactly what you told it.
Try starting pos out at the 10 and see what happens.

Answer 2

If it's not trivial to you, here a suggestion
int pos=0;
unsigned long previousTime =0;
int increment = 1;
int interval = 10;
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
}
void loop() {
unsigned long currentTime = millis();
if(currentTime - previousTime >= interval){
previousTime = currentTime;
pos += increment;
if(pos <= 10) increment = 1;
if(pos >= 100) increment = -1;
// else leave increment as is ...
Serial.println(pos);
}
}