Add arduino part

gradual_input.ino

@@ -0,0 +1,69 @@
+#include <Wire.h>
+#include <LiquidCrystal_I2C.h>
+LiquidCrystal_I2C lcd(0x3F, 16, 2);
+#include <SoftwareSerial.h>
+SoftwareSerial btSerial(10, 11);
+
+String btData;
+int taste;
+
+void setup() {
+  lcd.init();                      // Display starten
+  lcd.backlight();                 // Hintergrundlicht am Display
+  btSerial.begin(9600);
+  Serial.begin(115200);
+  pinMode(3, OUTPUT); // PWM_A-Signal als Ausgang
+  pinMode(2, OUTPUT); // AIN_1 digitaler Ausgang
+  pinMode(4, OUTPUT); // AIN_2 digitaler Ausgang
+  pinMode(5, OUTPUT); // BIN_1 digitaler Ausgang
+  pinMode(7, OUTPUT); // BIN_2 digitaler Ausgang
+  pinMode(6, OUTPUT); // PWM_B-Signal als Ausgang
+  lcd.setCursor(0, 0);
+  lcd.print("Taste druecken");
+  delay(3000);
+}
+
+void loop() {
+  lcd.clear();
+  lcd.setCursor(0, 0); lcd.print("Hallo");
+  
+  if (btSerial.available()) {
+    byte c = byte(btSerial.read()); // Cast last char to byte
+    while (btSerial.available() > 0) c = byte(btSerial.read()); // This could (should) be done above, but idk
+    char left = char(c & 0xF0); // interpret first four bits as signed char
+    char right = char((c & 0x0F) << 4); // interpret last four bits as signed char
+    writeMotor(left, right);
+  }
+
+  delay(50);
+}
+
+void writeMotor(char left, char right) {
+  byte prec = 1;
+  
+  if (right == 0) {
+    digitalWrite(2, LOW);
+    digitalWrite(4, LOW);
+  } else if (right > 0) {
+    digitalWrite(2, LOW);
+    digitalWrite(4, HIGH);
+    digitalWrite(3, byte(right) / prec);
+  } else {
+    digitalWrite(2, HIGH);
+    digitalWrite(4, LOW);
+    digitalWrite(3, byte(-right) / prec);
+  }
+
+  if (left == 0) {
+    digitalWrite(5, LOW);
+    digitalWrite(7, LOW);
+  } else if (left > 0) {
+    digitalWrite(5, LOW);
+    digitalWrite(7, HIGH);
+    digitalWrite(6, byte(left) / prec);
+  } else {
+    digitalWrite(5, HIGH);
+    digitalWrite(7, LOW);
+    digitalWrite(6, byte(-left) / prec);
+  }
+}