All Questions
7 questions
1
vote
1
answer
108
views
Fixing a pedestrian traffic light sequence pattern in a cycle using millis and without delay
I was emulating the pedestrian traffic light cyclic pattern (red, green, green flashing) in the next Arduino code. But when I run this code with my ESP8266 Wemos D1 mini controller, it appears the ...
2
votes
1
answer
5k
views
How to set the sampling frequency in Arduino without using a delay
I am reading an ECG signal using a single lead heart rate monitor. What I know is that when I use delay(15) it means that I am getting 66.67 readings in a second which corresponds to the sampling ...
3
votes
1
answer
9k
views
How can I replace pulseIn with interrupts?
I have an HC-SR04 sensor and I need to get the distance from it. I use this code:
digitalWrite(trig, LOW);
delayMicroseconds(2);
digitalWrite(trig, HIGH);
delayMicroseconds(10);
digitalWrite(trig, ...
- 300
0
votes
2
answers
234
views
Sketch does not work without delay() or other complex functions like digitalWrite()
I have a simple sketch here that should just blink a led once a second or so (approximately):
boolean onOff=true;
int count=0;
void setup() {
pinMode(13, OUTPUT);
}
void loop() {
count++;
...
0
votes
1
answer
1k
views
How to delay outside loop
I am using a function outside loop(), which is called after an interrupt. Inside this function, I am setting several relays that need to change after a second or two, depending on my setting. I tried ...
- 15
14
votes
4
answers
54k
views
Using millis() and micros() inside an interrupt routine
The documentation for attachInterrupt() says:
... millis() relies on interrupts to count, so it will never increment inside an ISR. Since delay() requires interrupts to work, it will not work if ...
- 253
5
votes
4
answers
7k
views
Is `millis()` affected by long ISRs?
I have a project that uses timers and interrupts frequently. A lot of CPU time is spent handling ISRs over an extended period of time.
Would this affect code inside the main loop that relies on the ...
- 6,335