Programming a neutral/off range to control relays

Using Arduino Programming Questions
1

I have a spring centered analog thumbwheel switch that I need to use in this project. I need help programming a neutral/off range for relays. I found the center/neutral point on thumbwheel switch at approximately what =522.
. This is too sensitive and does not always turn off relays when the thumbwheel switch is centered to the neutral/off position without searching for =522.

Please reference sketch Project 51. The lines I am having difficulty with are highlighted.

Project 51.pdf (76.6 KB)

2

it is very difficult to extract code from a pdf.
please edit your post, posting the code in the highlighted area after clicking the <code> icon

shouldn't setting the relay LOW simply be an else case?

3

are you using an analog input to read the thumb switch?

unless you are very careful and use high quality components one tends to get some noise - use a range, e.g. switch off if reading is in the range 510 to 530???

4

he switches in on when > 700 and < 300

5

else if sensorValue >> 500 && sensorValue << 600;

You can adjust the upper and lower limits to suit what works best for you.

6

That’s another good way of doing it.

7

Hello maverick61

You might mod this joystick sketch to your project needs.

// make variables
constexpr uint8_t Joy_x {A0};
// make application
void setup()
{
  Serial.begin(115200);
}
void loop()
{
  switch (analogRead(Joy_x))
  {
    case 0 ... 500: Serial.println(F("lower bounds")); break;
    case 501 ... 520: Serial.println(F("middle bounds")); break;
    case 521 ... 1023: Serial.println(F("upper bounds")); break;
  }
  delay (1000); // for testing only 
}

Have a nice day and enjoy coding in C++.

8

I had to do a little modification to your code and I got everything working just as I need it to. Thanks!!

} else if (sensorValue >= 400 && sensorValue <= 600) {
digitalWrite(relays, LOW);}

9

Solved!
Thank you all for your help.

} else if (sensorValue >= 400 && sensorValue <= 600) {
digitalWrite(relays, LOW);}

10

All these recent posts about analog thumbwheel switches are confusing me…

THUMBWHEEL SWITCHES

IMG_0091

11

It could be they are using an analog input and a set of resistors in series, with the switches selecting the several points on the series string. One input to determine which switch is closed. I watched a video that used this method to decode a 16 button keypad.

Or maybe it is a potentiometer, spring centered like a one axis joystick.

12

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