int adcPin = A0;

void setup() {
  Serial.begin(9600);
}
void loop() {
  int adcRead = analogRead(adcPin);

  float adcValue = map(adcRead, 0, 1023, 0, 256);

  float current = adcToCurrent(adcValue);

  float temperature = currentToTemperature(current);

  Serial.print("ADC Value: ");
  Serial.print(adcValue);
  Serial.print(" | Current: ");
  Serial.print(current);
  Serial.print(" mA | Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

  delay(1000);
}

float adcToCurrent(float adcValue) {
  return (adcValue * (20.0 - 4.0) / 256.0) + 4.0;
}

float currentToTemperature(float current) {
  return ((current - 4.0) * (80.0 - (-30.0)) / (20.0 - 4.0)) - 30.0;
}