AS5600 encoder stepper nema 17

AS5600 encoder stepper nema 17,

https://www.amazon.it/dp/B0CLNYGD4Z?ref=ppx_yo2ov_dt_b_fed_asin_title

Arduino code for testing:

// AS5600 - ANALOG ONLY (OUT -> A0, DIR -> GND)
const int PIN_OUT = A0;
const int PIN_BTN_ZERO = 2; // optional: button to GND for zero
const float ALPHA = 0.2f; // EMA filter to stabilize

float ema = 0.0f;
float zeroDeg = 0.0f;
int minRaw = 1023, maxRaw = 0;

float wrap360(float d){ while(d<0)d+=360.0f; while(d>=360)d-=360.0f; return d; }

void setup() {
Serial.begin(115200);
pinMode(PIN_OUT, INPUT);
pinMode(PIN_BTN_ZERO, INPUT_PULLUP);

int r = analogRead(PIN_OUT);
ema = r; minRaw = r; maxRaw = r;

Serial.println(F("== AS5600 Analog Only =="));
Serial.println(F("Commands: 'z' = set zero | 'c' = reset calibration."));
Serial.println(F("Make a full turn after starting to calibrate min/max."));
}

void loop() {
// serial commands
if (Serial.available()) {
char c = Serial.read();
if (c=='z') { zeroDeg = estimateDeg(); Serial.println(F(">> ZERO set.")); }
if (c=='c') { int r=analogRead(PIN_OUT); ema=r; minRaw=r; maxRaw=r; Serial.println(F(">> Calibration reset.")); }
}
// zero button (optional)
static bool lastBtn = HIGH;
bool btn = digitalRead(PIN_BTN_ZERO);
if (lastBtn==HIGH && btn==LOW) { zeroDeg = estimateDeg(); Serial.println(F(">> ZERO set (button).")); }
lastBtn = btn;

// reading
int raw = analogRead(PIN_OUT);
ema = ALPHA*raw + (1.0f-ALPHA)*ema;
if (raw if (raw>maxRaw) maxRaw=raw;

float deg = estimateDeg();
float degZero = wrap360(deg - zeroDeg);

Serial.print(F("raw: ")); Serial.print(raw);
Serial.print(F(" | ema: ")); Serial.print(ema,1);
Serial.print(F(" | min/max: ")); Serial.print(minRaw); Serial.print('/'); Serial.print(maxRaw);
Serial.print(F(" | deg: ")); Serial.print(deg,2);
Serial.print(F(" | deg(zero): ")); Serial.println(degZero,2);
delay(50);
}

float estimateDeg() {
int span = maxRaw - minRaw;
if (span < 8) { // until you have sufficient range
return (ema / 1023.0f) * 360.0f; // full scale 0..5V
}
float norm = (ema - minRaw) / (float)span; // 0..1
return norm * 360.0f;
}