ESP8266 Arduino and Rotary Encoder

Question

I'm trying to use the sketch bellow to work with my WeMos D1 mini (ESP8266 Arduino platform) together with Rotary Encoder KY-040 or MJKDZ, and it's not working for some reason, but the same sketch is working great on the Arduino Uno (with different pin assignment - 2, 3, 4).

Can someone explain to me what is the issue with the sketch?

const int PinA = 14; // Used for generating interrupts using CLK signal
const int PinB = 12; // Used for reading DT signal
const int PinSW = 13; // Used for the push button switch
int lCnt = 0; // Keep track of last rotary value
volatile int vPos = 0; // Updated by the ISR (Interrupt Service Routine)
void isr_event () {
 static unsigned long lIsrTmr = 0; // Last Interrupt time
 unsigned long IsrTmr = millis(); // Interrupt time
 // If interrupts come faster than 5ms, assume it's a bounce and ignore
 if (IsrTmr - lIsrTmr > 5) {
 if (digitalRead(PinB) == LOW)
 {
 vPos++ ; // Could be +5 or +10
 }
 else {
 vPos-- ; // Could be -5 or -10
 }
 // Restrict value from 0 to +100
 vPos = min(10, max(0, vPos));
 // Keep track of when we were here last (no more than every 5ms)
 lIsrTmr = IsrTmr;
 }
}
void setup()
{
 Serial.begin(9600);
 // Rotary pulses are INPUTs
 pinMode(PinA, INPUT);
 pinMode(PinB, INPUT);
 pinMode(PinSW, INPUT_PULLUP); // Switch is floating so use the in-built PULLUP so we don't need a resistor
 attachInterrupt(digitalPinToInterrupt(PinA), isr_event, LOW); // Attach the routine to service the interrupts
 Serial.println(F("Starting...")); // Ready to go!
}
void loop()
{
 // Is someone pressing the rotary switch?
 if ((!digitalRead(PinSW))) {
 vPos = 0;
 while (!digitalRead(PinSW))
 delay(10);
 }
 // If the current rotary switch position has changed then update everything
 if (vPos != lCnt) {
 // Write out to serial monitor the value and direction
 Serial.println(vPos);
 // Keep track of this new value
 lCnt = vPos ;
 }
}

• Majenko: Define "not work"... That phrase can mean anything from "jittery movement" to "the whole thing exploded and burned off my eyebrows".
• beic: @Majenko No, didn't exploded just not getting any output to the Serial monitor.
• Majenko: Not even the initial "Starting" message?
• beic: Yes, I get the message "Starting..."
• beic: To be sure 100%, I recompiled for Arduino Uno as we speak and tested with both Rotary Encoder type ( KY-040 and MJKDZ) and it's working as expected. But as I said, it's not outputing nothing except "Starting..." on ESP8266 platform. @Majenko

Answer 1

The ESP8266 doesn't know what a "LOW" interrupt is. You will have to change your code to use FALLING, RISING or CHANGE interrupts only.

• beic: Tried all of them, the FALLING gives me the best result, also I made pinMode(PinA, INPUT); and removed digitalPinToInterrupt(), and made PinB to be attachInterrupt, but the output is weird, there are duplicates and messed counts too. link
• Jaromanda X: perhaps your debounce isn't - perhaps this code can help
• beic: @JaromandaX tried that to and it's working really bad, skipping and messing numbers up