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Andrew Kesterson
2026-06-08 08:58:44 -04:00
parent 2384e6ecee
commit c285a47e23
4 changed files with 72 additions and 70 deletions
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74
06-joystick/README.md
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@@ -1,5 +1,7 @@
# Joystick demo
![breadboard](breadboard.png)
This demo shows using a joystick peripheral to control the position of an LED light on a WS2812 light strip, as well as how to calibrate a joystick, while using PWM driven LEDs to show the relative position of a joystick on its axis and the status of the momentary joystick pushbutton.
I won't cover the entirety of the code here, but you are welcome to peruse it for yourself: [06-joystick.ino](06-joystick.ino)
@@ -18,6 +20,10 @@ I've been using a breadboard software named [Fritzing](https://fritzing.org/) to
I also haven't gotten the hang of Fritzing's schematic functionality. It can generate schematics from breadboards, which is pretty cool, but I'll be honest the schematics are soup. You have to do a ton of cleanup to make them readable, and I haven't devoted the time yet to figuring out the best way to manage that workflow.
![schematic](schematic.png)
That, uh ... That needs some work.
But if you're getting into this hobby, Fritzing is definitely worth the (small) money.
## I still don't trust C++
@@ -217,41 +223,39 @@ int calibrateJoystick(Joystick *js)
ERROR(ERRNO_NULLPOINTER);
}
curmillis = millis();
if ( js->state == JOYSTICK_STATE_CALIBRATING ) {
if ( js->x.calibration.start_time == 0 || js->y.calibration.start_time == 0 ) {
// Starting a new calibration cycle
Serial.printf("Starting a new calibration cycle\n");
js->x.calibration.low = 65535;
js->x.calibration.high = 0;
js->y.calibration.low = 65535;
js->y.calibration.high = 0;
js->x.calibration.start_time = curmillis;
js->y.calibration.start_time = curmillis;
return ERRNO_SUCCESS;
}
if ( (curmillis - js->x.calibration.start_time) >= js->x.calibration.stable_time ) {
js->state = JOYSTICK_STATE_CALIBRATED;
js->x.calibration.start_time = 0;
js->y.calibration.start_time = 0;
Serial.printf("Calibrated joystick to x: <%d, %d> y <%d, %d>\n",
js->x.calibration.low,
js->x.calibration.high,
js->y.calibration.low,
js->y.calibration.high);
return ERRNO_SUCCESS;
}
x = analogRead(js->x.pin);
if ( x < js->x.calibration.low ) {
js->x.calibration.low = x;
} else if ( x > js->x.calibration.high ) {
js->x.calibration.high = x;
}
y = analogRead(js->y.pin);
if ( y < js->y.calibration.low ) {
js->y.calibration.low = y;
} else if ( y > js->y.calibration.high ) {
js->y.calibration.high = y;
}
if ( js->x.calibration.start_time == 0 || js->y.calibration.start_time == 0 ) {
// Starting a new calibration cycle
Serial.printf("Starting a new calibration cycle\n");
js->x.calibration.low = 65535;
js->x.calibration.high = 0;
js->y.calibration.low = 65535;
js->y.calibration.high = 0;
js->x.calibration.start_time = curmillis;
js->y.calibration.start_time = curmillis;
return ERRNO_SUCCESS;
}
if ( (curmillis - js->x.calibration.start_time) >= js->x.calibration.stable_time ) {
js->state = JOYSTICK_STATE_CALIBRATED;
js->x.calibration.start_time = 0;
js->y.calibration.start_time = 0;
Serial.printf("Calibrated joystick to x: <%d, %d> y <%d, %d>\n",
js->x.calibration.low,
js->x.calibration.high,
js->y.calibration.low,
js->y.calibration.high);
return ERRNO_SUCCESS;
}
x = analogRead(js->x.pin);
if ( x < js->x.calibration.low ) {
js->x.calibration.low = x;
} else if ( x > js->x.calibration.high ) {
js->x.calibration.high = x;
}
y = analogRead(js->y.pin);
if ( y < js->y.calibration.low ) {
js->y.calibration.low = y;
} else if ( y > js->y.calibration.high ) {
js->y.calibration.high = y;
}
return ERRNO_SUCCESS;
}