Irregular readings from encoder with attachInterrupt()
Posted: Tue Jan 11, 2022 6:47 pmHi guys.
I need to read an encoder using the interrupt function by the wemos d1 mini board. However, plotting the readings results in an irregular waveform.
So I tested doing the reading without the interrupt function, just with digitalRead, and when plotting, the waveform was as expected.
In my project I can't just use digitalRead because I can lose readings while executing other functions. Any solution to this problem?
I attached the waveforms that I obtained in each of the tests, through the Serial Plotter. Also, I attached the circuit.
https://drive.google.com/file/d/1WTYii8 ... sp=sharing.
Frequency of the waveform is 40hz.
Below is a simplified code that I used to do just these reading tests:
I need to read an encoder using the interrupt function by the wemos d1 mini board. However, plotting the readings results in an irregular waveform.
So I tested doing the reading without the interrupt function, just with digitalRead, and when plotting, the waveform was as expected.
In my project I can't just use digitalRead because I can lose readings while executing other functions. Any solution to this problem?
I attached the waveforms that I obtained in each of the tests, through the Serial Plotter. Also, I attached the circuit.
https://drive.google.com/file/d/1WTYii8 ... sp=sharing.
Frequency of the waveform is 40hz.
Below is a simplified code that I used to do just these reading tests:
Code: Select all
#define motor 4
#define rotary_encoder 14
boolean signal_encoder = 0;
ICACHE_RAM_ATTR void waveForm() {
signal_encoder = !signal_encoder;
}
void setup() {
Serial.begin(115200);
pinMode(rotary_encoder, INPUT_PULLUP);
pinMode(motor, OUTPUT);
// attachInterrupt(digitalPinToInterrupt(rotary_encoder), waveForm, CHANGE);
}
void loop() {
digitalWrite(motor, 1);
if(digitalRead(rotary_encoder))signal_encoder=1;
else signal_encoder = 0;
Serial.println(signal_encoder);
delay(1);
}