Joystick with Espruino WiFi

[espruino-discuss2]

Posted at 2019-05-14 by Andrea

Hi everyone,
I would like to use this Joystick: https://www.adafruit.com/product/512
with the Espruino WiFi (2v02), it currently works on Feather M4 Express (CircuitPython):

import ...

stickY = analogio.AnalogIn(board.A0) # analog
stickX = analogio.AnalogIn(board.A1) # analog
stickSelect = DigitalInOut(board.A2) # digital
stickSelect.direction = Direction.INPUT
stickSelect.pull = Pull.UP

while True:
... yValue = stickY.value
... xValue = stickX.value
... selectValue = stickSelect.value
... if yValue > 90 and yValue < 32000: print("Y DOWN")
... elif yValue > 40000 and yValue < 65500: print("Y UP")
... elif xValue > 90 and xValue < 32000: print("X LEFT")
... elif xValue > 40000 and xValue < 65500: print("X RIGHT")
... elif selectValue == False: print("PRESS")
... else: pass

In JavaScript I'm doing tests, Y and X both are recognized at '50 %' (yes UP and LEFT, no DOWN and RIGHT) ...

var BTN = {Y: A0, X: A1, SELECT: B10};
pinMode(BTN.Y, "input_pulldown");
pinMode(BTN.X, "input_pulldown");
pinMode(BTN.SELECT, "input_pulldown"); // (auto, input_pulldown and input_pullup) => NOT WORK

while(true){
  if (BTN.Y.read()){console.log("Y");}
  else if (BTN.X.read()){console.log("X");}
  else if (BTN.SELECT.read()){console.log("SELECT");}
  else {};
};

What do you think I can solve?

THANK YOU

[gfwilliams]

Posted at 2019-05-14 by @gfwilliams

Looks to me like that's an analog joystick, so you need to read analog values. You also don't need the pin modes that you had:

var BTN = {Y: A0, X: A1, SELECT: B10};
pinMode(BTN.SELECT, "input_pullup");

setInterval(function() {
  yValue = analogRead(BTN.Y);
  xValue = analogRead(BTN.X);
  selectValue = !digitalRead(BTN.SELECT);
  console.log(xValue, yValue, selectValue);
}, 500);

Something like the above should print some values between 0 and 1, and you should be able to figure out when the joystick is over one side by looking at those values (eg less than 0.2 or greater than 0.8 maybe).

Also one thing to watch out for is I'd really avoid while(true) in JavaScript because JS likes to execute small functions that execute quickly in order to be able to multi-task. I changed it for some code that checks every 500ms (twice a second)

[espruino-discuss2]

Posted at 2019-05-14 by Andrea

GREAT, IT WORKS!

THANK YOU SO MUCH!

:-)