Potentiometer in sync with slider widget

Need Help With My Project
1

Im trying to sync a potentiometer with the slider widget. I figured out how to sync a button with a widget button but i can’t seen to figure this out.
Can anyone point me in the right direction ?
Thanks

1 Like
2

Blynk.virtualWrite(slider, analogRead(potPin));

When not being more specific that should do it

3

Unfortunately, short of motorizing the pot (something like how a Servo works, but without the hold position tendencies), then every time you adjust the slider, it will readjust back to the potentiometer position… so it really becomes a one way sync… or more precisely, just an position indicator for the potentiometer, and a Level or Graph Widget would work just as well in that case.

4

I just figured this out 10 seconds ago when i finished my code with the use of an old post of yours :stuck_out_tongue:

int potPin= A0;  //Declare potPin to be analog pin A0
int LEDPin= D4;  // Declare LEDPin to be arduino pin 9
int readValue;  // Use this variable to read Potentiometer
int writeValue; // Use this variable for writing to LED
int brightness = 0; // Start off with LED off

void setup() {
  Serial.begin(9600);      // turn on Serial Port
  Blynk.begin(auth, ssid, pass);
  pinMode(potPin, INPUT);  //set potPin to be an input
  pinMode(LEDPin, OUTPUT); //set LEDPin to be an OUTPUT
}

BLYNK_WRITE(V1) // Slider widget function, runs everytime slider is adjusted.
{
  brightness = param.asInt(); // Get slider value.
  analogWrite(LEDPin, brightness); //Send data to LED
}

void Potentiometer()
{
  readValue = analogRead(potPin); //Read data of Potentiometer
  brightness = (255./1023.) * readValue; //Calculate Write Value for LED
  Blynk.virtualWrite(V1, brightness); //Send feedback to slider Widget
  analogWrite(LEDPin, brightness); //Send data to LED
}

void loop() {
 Blynk.run();
 Potentiometer();
}

I might switch to buttons in stead or i should try to figure out how to make Blynk ignore potentiometer input when the slider is being adjusted.

5

Some form of comparator flag? Give the slider priority of movement and only readjust if pot moves from last pre-slider adjustment position.

1 Like
6

I guess that should work. I’ll try it out :slight_smile:

7

This is where i got so far now its just a matter of resyncing the slider and the potentiometer without looping the whole thing.

    int potPin= A0;  //Declare potPin to be analog pin A0
    int LEDPin= D4;  // Declare LEDPin to be arduino pin 9
    int readValue;  // Use this variable to read Potentiometer
    int writeValue; // Use this variable for writing to LED
    int brightness = 0; // Start off with LED off
    int potValue ;

void setup() {
  Serial.begin(9600);      // turn on Serial Port
  Blynk.begin(auth, ssid, pass);
  pinMode(potPin, INPUT);  //set potPin to be an input
  pinMode(LEDPin, OUTPUT); //set LEDPin to be an OUTPUT
  potValue = analogRead(potPin);
}

BLYNK_WRITE(V1) // Slider to led
{

  brightness = param.asInt(); // Get slider value.
  analogWrite(LEDPin, brightness); //Send data to LED
}

void Potentiometer() // Potentiometer to led
{
  readValue = analogRead(potPin);
  if(potValue != readValue){
    brightness = (255./1023.) * readValue; //Calculate Write Value for LED
    analogWrite(LEDPin, brightness); //Send data to LED
    potValue = analogRead(potPin);
    //Blynk.virtualWrite(V1, brightness); //Send feedback to slider Widget
  }
  delay(300);
}

void loop() {
 Blynk.run();
 Potentiometer();
}