IR Remote Controlled DC Fan with LCD Display

Projects General Guidance
1

Hi, I'm creating an IR Remote Controlled DC Fan with LCD Display, but I'm having problems with setting the motor RPM while running the code. As soon as I press a button on the remote the motor turns off.

The Code:

#include "LiquidCrystal.h"
#include "IRremote.h"

LiquidCrystal lcd(6, 7, 2, 3, 4, 5);
int receiver = 8;

int ENABLE = 11;
int DIRA = 9;
int DIRB = 10;

IRrecv irrecv(receiver);
decode_results results;

int translateIR() {
  int fanSpeed = 0;
  lcd.setCursor(10, 1);
  switch (results.value) {
    case 0xFFA25D: 
      lcd.print("0"); 
      fanSpeed = 0;
      break;
    case 0xFF30CF:
      lcd.print("1");
      fanSpeed = 85;
      break;
    case 0xFF18E7: 
      lcd.print("2"); 
      fanSpeed = 170;
      break;
    case 0xFF7A85: 
      lcd.print("3"); 
      fanSpeed = 255;
      break;
    default:
      Serial.println(" other button   ");
  }
  delay(500);
  return fanSpeed;
}

void setup() {
  pinMode(ENABLE, OUTPUT);
  pinMode(DIRA, OUTPUT);
  pinMode(DIRB, OUTPUT);
  irrecv.enableIRIn();
  lcd.begin(16, 2);
  lcd.print("  Fan Controls");
  Serial.begin(9600);
}

void loop() {
  if (irrecv.decode(&results)) {
    irrecv.resume();
  }
  int speed = translateIR();
  lcd.setCursor(0, 1);
  lcd.print("Fan Speed:");
  digitalWrite(ENABLE,HIGH);
  digitalWrite(DIRA,LOW);
  digitalWrite(DIRB,HIGH);
  analogWrite(ENABLE, speed);
  delay(1000);
}
2

This sets the speed to stop. Does the "other button" come up on the serial monitor?

3 
#include "LiquidCrystal.h"
#include "IRremote.h"

LiquidCrystal lcd(6, 7, 2, 3, 4, 5);
int receiver = 8;

int ENABLE = 11;
int DIRA = 9;
int DIRB = 10;

IRrecv irrecv(receiver);
decode_results results;

int translateIR() {
  static int fanSpeed = 0; // try this from https://www.arduino.cc/reference/en/language/variables/variable-scope-qualifiers/static/
  lcd.setCursor(10, 1);
  switch (results.value) {
    case 0xFFA25D: 
      lcd.print("0"); 
      fanSpeed = 0;
      break;
    case 0xFF30CF:
      lcd.print("1");
      fanSpeed = 85;
      break;
    case 0xFF18E7: 
      lcd.print("2"); 
      fanSpeed = 170;
      break;
    case 0xFF7A85: 
      lcd.print("3"); 
      fanSpeed = 255;
      break;
    default:
      Serial.println(" other button   ");
  }
  delay(500);
  return fanSpeed;
}

void setup() {
  pinMode(ENABLE, OUTPUT);
  pinMode(DIRA, OUTPUT);
  pinMode(DIRB, OUTPUT);
  irrecv.enableIRIn();
  lcd.begin(16, 2);
  lcd.print("  Fan Controls");
  Serial.begin(9600);
}

void loop() {
  if (irrecv.decode(&results)) {
    irrecv.resume();
  }
  int speed = translateIR();
  lcd.setCursor(0, 1);
  lcd.print("Fan Speed:");
  digitalWrite(ENABLE,HIGH);
  digitalWrite(DIRA,LOW);
  digitalWrite(DIRB,HIGH);
  analogWrite(ENABLE, speed);
  delay(1000);
}
4

it keeps repeating on the serial monitor, even when no buttons are pressed

and no more inputs are taken after the first one.

5

nope still not working

6

You set fanSpeed to zero, and default happens when translateIR() does not see 1, 2, or 3. What button is your sketch seeing?

Very unhelpful.

7

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