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Analog joystick
I found this joystick at the recycling center, but the cable was cut off, so I had to test all pins in order to determine which one correspond to what function. For the main stick, it used two potentiometers but I had to solder one more wire to make them work. I took all necessary information from the official Arduino joystick page, but I adapted the code.
Code
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/** * The program read the values from the joystick (analog inputs!), * performs some auto-callibration and outputs X and Y as of an * intervall [-10,10]. */ int joyPinX = 1; // X pin int joyPinY = 0; // Y pin int value = 0; // variable to hold the actual reading int xmin = 200; // X minimum value int xmax = 800; // X maximum value int ymin = 200; // Y minimum value int ymax = 800; // Y maximum value int xzero = 0; // the first X value (don't touch the joystick at startup!) int yzero = 0; // the first Y value int segs = 20; // number of intervalls to consider par half direction double zerohold = 4; // number of intervalls to consider as "zero position" void setup() { Serial.begin(115200); // do the first reading yzero = analogRead(joyPinY); xzero = analogRead(joyPinX); } void loop() { // read the X value value = analogRead(joyPinX); // push limits if(value<xmin) xmin=value; else if (value>xmax) xmax = value; // start at zero int x = 0; // divide lower half int seg = (xzero-xmin)/(segs+zerohold); // find what segment we are in for(int i=0;i<segs+1;i++) { if (value>=xzero-((segs-i)+zerohold)*seg) x=i; } // devide upper part seg = (xmax-xzero)/(segs+zerohold); // find what segment we are in for(int i=segs+1;i<2*segs+1;i++) { if (value>=xzero+((i-segs-1)+zerohold)*seg) x=i; } // make X range from [-10,10] instead of [0,20] x-=segs; // invert X x=-x; // the same as before but with "Y" :-) value = analogRead(joyPinY); if(value<ymin) ymin=value; else if (value>ymax) ymax = value; int y = 0; seg = (yzero-ymin)/(segs+1); for(int i=0;i<segs+1;i++) { if (value>=yzero-((segs-i)+1)*seg) y=i; } seg = (ymax-yzero)/(segs+zerohold); for(int i=segs+1;i<2*segs+1;i++) { if (value>=yzero+((i-segs-1)+zerohold)*seg) y=i; } y-=segs; // print if on the screen Serial.print("X = "); Serial.print(x); Serial.print(" - Y = "); Serial.println(y); // wait some time delay(100); }
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