RC CAR

#include #include #include #include #include // ================= MOTOR PINS (MX1508) ================= #define IN1 D5 #define IN2 D6 #define IN3 D7 #define IN4 D8 // ================= STATUS LED ================= #define STATUS_LED LED_BUILTIN // ================= DEVICE CONFIG ================= #define DEVICE_ID "C2" // CHANGE FOR EACH CAR #define EEPROM_SIZE 100 ESP8266WebServer server(80); WebSocketsServer webSocket(81); // ================= STATUS VARIABLES ================= bool pageAccessed = false; unsigned long lastBlink = 0; bool ledState = false; // ================= STRUCTURES ================= typedef struct { char targetID[4]; char ssid[32]; char password[32]; } config_message; typedef struct { char deviceID[4]; bool success; } ack_message; config_message receivedData; config_message storedConfig; ack_message ackData; // 🔥 PUT MASTER MAC HERE uint8_t masterMAC[] = {0xC4,0xD8,0xD5,0x12,0x9A,0x51}; // ======================================================= // ================= MOTOR CONTROL ======================= // ======================================================= void stopCar() { digitalWrite(IN1, LOW); digitalWrite(IN2, LOW); digitalWrite(IN3, LOW); digitalWrite(IN4, LOW); } void forward() { digitalWrite(IN1, HIGH); digitalWrite(IN2, LOW); digitalWrite(IN3, HIGH); digitalWrite(IN4, LOW); } void backward() { digitalWrite(IN1, LOW); digitalWrite(IN2, HIGH); digitalWrite(IN3, LOW); digitalWrite(IN4, HIGH); } void left() { digitalWrite(IN1, HIGH); digitalWrite(IN2, LOW); digitalWrite(IN3, LOW); digitalWrite(IN4, LOW); } void right() { digitalWrite(IN1, LOW); digitalWrite(IN2, LOW); digitalWrite(IN3, HIGH); digitalWrite(IN4, LOW); } // ======================================================= // ================= EEPROM FUNCTIONS ==================== // ======================================================= void saveConfig(config_message data) { EEPROM.begin(EEPROM_SIZE); EEPROM.put(0, data); EEPROM.commit(); EEPROM.end(); } void loadConfig(config_message &data) { EEPROM.begin(EEPROM_SIZE); EEPROM.get(0, data); EEPROM.end(); // Validate EEPROM (prevent garbage) if (data.ssid[0] == '\0' || data.ssid[0] == 0xFF) { memset(&data, 0, sizeof(data)); } } // ======================================================= // ================= ACCESS POINT ======================== // ======================================================= void startAP(const char* ssid, const char* password) { WiFi.softAP(ssid, password); Serial.println("===== ACCESS POINT STARTED ====="); Serial.print("SSID: "); Serial.println(ssid); Serial.print("IP: "); Serial.println(WiFi.softAPIP()); Serial.println("================================"); } // ======================================================= // ================= WEB MANIFEST ======================== // ======================================================= void handleManifest() { server.send(200, "application/json", R"rawliteral( { "name": "RC Car", "short_name": "RC Car", "display": "standalone", "start_url": "/", "background_color": "#000000", "theme_color": "#000000", "orientation": "landscape" } )rawliteral"); } // ======================================================= // ================= WEB PAGE ============================ // ======================================================= void handleRoot() { pageAccessed = true; digitalWrite(STATUS_LED, LOW); server.send(200, "text/html", R"rawliteral( RC CAR

)rawliteral"); } // ======================================================= // ================= WEBSOCKET =========================== // ======================================================= void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length) { if (type == WStype_TEXT && length > 0) { char cmd = payload[0]; if (cmd == 'F') forward(); else if (cmd == 'B') backward(); else if (cmd == 'L') left(); else if (cmd == 'R') right(); else stopCar(); } } // ======================================================= // ================= ESP-NOW RECEIVE ===================== // ======================================================= void onDataRecv(uint8_t *mac, uint8_t *incomingData, uint8_t len) { memcpy(&receivedData, incomingData, sizeof(receivedData)); if (strcmp(receivedData.targetID, DEVICE_ID) == 0 || strcmp(receivedData.targetID, "ALL") == 0) { strcpy(ackData.deviceID, DEVICE_ID); ackData.success = true; esp_now_send(masterMAC, (uint8_t*)&ackData, sizeof(ackData)); saveConfig(receivedData); delay(1000); ESP.restart(); } } // ======================================================= // ================= SETUP =============================== // ======================================================= void setup() { pinMode(IN1, OUTPUT); pinMode(IN2, OUTPUT); pinMode(IN3, OUTPUT); pinMode(IN4, OUTPUT); stopCar(); pinMode(STATUS_LED, OUTPUT); digitalWrite(STATUS_LED, HIGH); Serial.begin(115200); delay(1000); WiFi.mode(WIFI_AP_STA); server.on("/", handleRoot); server.on("/manifest.json", handleManifest); server.begin(); webSocket.begin(); webSocket.onEvent(webSocketEvent); Serial.println("========== DEVICE INFO =========="); Serial.print("Device ID: "); Serial.println(DEVICE_ID); Serial.print("Station MAC: "); Serial.println(WiFi.macAddress()); Serial.println("================================="); loadConfig(storedConfig); if (strlen(storedConfig.ssid) > 0) { startAP(storedConfig.ssid, storedConfig.password); } else { startAP("CAR_" DEVICE_ID, "12345678"); } if (esp_now_init() != 0) { Serial.println("ESP-NOW Init Failed"); return; } esp_now_set_self_role(ESP_NOW_ROLE_SLAVE); esp_now_register_recv_cb(onDataRecv); esp_now_add_peer(masterMAC, ESP_NOW_ROLE_CONTROLLER, 1, NULL, 0); Serial.println("Receiver Ready."); } // ======================================================= // ================= LOOP ================================ // ======================================================= void loop() { // Blink LED until page opened if (!pageAccessed && millis() - lastBlink >= 500) { lastBlink = millis(); ledState = !ledState; digitalWrite(STATUS_LED, ledState ? LOW : HIGH); } // Safety stop if disconnected if (webSocket.connectedClients() == 0) { stopCar(); } server.handleClient(); webSocket.loop(); }