Add PWM motor control and refactor engine update

Introduce ENA pins for both motors and implement rpmToPwm and setMotor.
Replace extensive Serial debug prints with concise motor‑drive logic in
Engine::update. Consolidate sonar pins into a single TRIG_AND_ECHO_PIN.
Update pinMode calls in the sketch to configure the new ENA pins.

Engine.cpp

@@ -1,4 +1,5 @@
 #include "Engine.h"
+#include "Config.h"
 using namespace EngineConsts;
 
 Engine::Engine(uint8_t throttlePin,
@@ -6,82 +7,41 @@ Engine::Engine(uint8_t throttlePin,
                uint8_t brakePin)
   : _throttlePin(throttlePin), _clutchPin(clutchPin), _brakePin(brakePin) {}
 
-void Engine::begin() {
-}
+void Engine::begin() {}
 
 float Engine::readNormalized(uint8_t pin) const {
   return analogRead(pin) / 1023.0f;
 }
 
 void Engine::update(float dt, uint8_t gearIdx) {
-  // Serial.println("----------------");
-
   const float throttle = readNormalized(_throttlePin);
-  // Serial.print("Throttle: ");
-  // Serial.println(throttle);
-
   const float clutch = readNormalized(_clutchPin);
-  // Serial.print("Clutch: ");
-  // Serial.println(clutch);
-
   const float brake = readNormalized(_brakePin);
-  // Serial.print("Brake: ");
-  // Serial.println(brake);
 
   const float targetRPM = RPM_IDLE + throttle * (RPM_MAX - RPM_IDLE);
-  // Serial.print("targetRPM: ");
-  // Serial.println(targetRPM);
 
   const float wheelRPM = (_speedMs / (2.0f * PI * WHEEL_RADIUS)) * 60.0f;
-  // Serial.print("wheelRPM: ");
-  // Serial.println(wheelRPM);
 
   const float gearRatio = GEAR_RATIO[gearIdx];
-  // Serial.print("gearRatio: ");
-  // Serial.println(gearRatio);
-
   const float drivenRPM = wheelRPM * fabs(gearRatio) * FINAL_DRIVE;
-  // Serial.print("drivenRPM: ");
-  // Serial.println(drivenRPM);
 
   _engineRPM = clutch * drivenRPM + (1.0f - clutch) * targetRPM;
-  // Serial.print("_engineRPM: ");
-  // Serial.println(_engineRPM);
-
   _engineRPM = constrain(_engineRPM, RPM_IDLE, 7500.0f);
-  // Serial.print("_engineRPM (constrain): ");
-  // Serial.println(_engineRPM);
 
   const float engineForce = (_engineRPM / RPM_MAX) * (1.0f - clutch) * ENGINE_FORCE_FACTOR;
-  // Serial.print("engineForce: ");
-  // Serial.println(engineForce);
-
   const float brakeForce = brake * BRAKE_FORCE_MAX;
-  // Serial.print("brakeForce: ");
-  // Serial.println(brakeForce);
-
   const float dragForce = 0.5f * DRAG_COEFF * FRONTAL_AREA * (_speedMs * _speedMs);
-  // Serial.print("dragForce: ");
-  // Serial.println(dragForce);
-
   const int direction = (gearIdx == -1) ? -1 : 1;
-  // Serial.print("direction: ");
-  // Serial.println(direction);
-
   const float netForce = direction * engineForce - brakeForce - dragForce;
-  // Serial.print("netForce: ");
-  // Serial.println(netForce);
-
   const float acceleration = netForce / CAR_MASS;
-  // Serial.print("acceleration: ");
-  // Serial.println(acceleration);
 
   _speedMs += acceleration * dt;
   if (_speedMs < 0.0f) _speedMs = 0.0f;
-  // Serial.print("_speedMs: ");
-  // Serial.println(_speedMs);
 
-  // delay(1000);
+  setMotor(IN_3, IN_4, ENA_2, targetRPM, false);
+
+  bool reverseWheel = (gearIdx == -1);
+  setMotor(IN_1, IN_2, ENA_1, wheelRPM * 10.0f, reverseWheel);
 }
 
 int Engine::getRPM() const {
@@ -91,3 +51,16 @@ int Engine::getRPM() const {
 int Engine::getSpeedKmh() const {
   return static_cast<int>((_speedMs * 3.6f) + 0.5f);
 }
+
+uint8_t Engine::rpmToPwm(float rpm) {
+  rpm = constrain(rpm, 0.0f, RPM_MAX);
+  return static_cast<uint8_t>(roundf(rpm / RPM_MAX * 255.0f));
+}
+
+void Engine::setMotor(uint8_t inA, uint8_t inB, uint8_t ena,
+                      float rpm, bool reverse) {
+  digitalWrite(inA, reverse ? LOW : HIGH);
+  digitalWrite(inB, reverse ? HIGH : LOW);
+
+  analogWrite(ena, rpmToPwm(rpm));
+}