/* Wall-E Rover Control ESP32-C3 + L298N (no PWM, full-speed only) - ESP32C3 creates its own WiFi network (AP mode) - User connects to SSID: "Wall-E Rover Control", password: "walle1234" - Visit http://192.168.4.1 in browser to control the rover By Jaagrav */ #include #include // ---------- Access Point Config ---------- const char* AP_SSID = "Wall-E Rover Control"; const char* AP_PASSWORD = "walle1234"; // at least 8 chars // ---------- L298N pins ---------- #ifndef D0 // Define pin numbers for XIAO ESP32-C3 if D0..D4 aren’t mapped #define D0 2 #define D1 3 #define D3 5 #define D4 4 #endif const int IN1 = D0; // Motor A const int IN2 = D1; // Motor A const int IN3 = D3; // Motor B const int IN4 = D4; // Motor B WebServer server(80); // ---------- Embedded Web UI ---------- const char INDEX_HTML[] PROGMEM = R"rawliteral( Wall-E Rover Control

Wall-E Rover Control

)rawliteral"; // ---------- Motor control ---------- void motorsStop() { digitalWrite(IN1, LOW); digitalWrite(IN2, LOW); digitalWrite(IN3, LOW); digitalWrite(IN4, LOW); } void motorsForward() { digitalWrite(IN1, HIGH); digitalWrite(IN2, LOW); digitalWrite(IN3, HIGH); digitalWrite(IN4, LOW); } void motorsBackward() { digitalWrite(IN1, LOW); digitalWrite(IN2, HIGH); digitalWrite(IN3, LOW); digitalWrite(IN4, HIGH); } void motorsLeft() { digitalWrite(IN1, LOW); digitalWrite(IN2, HIGH); digitalWrite(IN3, HIGH); digitalWrite(IN4, LOW); } void motorsRight() { digitalWrite(IN1, HIGH); digitalWrite(IN2, LOW); digitalWrite(IN3, LOW); digitalWrite(IN4, HIGH); } // ---------- API helpers ---------- void sendJson(const char* state){ server.send(200, "application/json", String("{\"state\":\"") + state + "\"}"); } void handleForward(){ motorsForward(); sendJson("forward"); } void handleBackward(){ motorsBackward(); sendJson("backward"); } void handleLeft(){ motorsLeft(); sendJson("left"); } void handleRight(){ motorsRight(); sendJson("right"); } void handleStop(){ motorsStop(); sendJson("stopped"); } void handleIndex(){ server.send(200, "text/html", INDEX_HTML); } void setup() { // Motor pins pinMode(IN1, OUTPUT); pinMode(IN2, OUTPUT); pinMode(IN3, OUTPUT); pinMode(IN4, OUTPUT); motorsStop(); Serial.begin(115200); delay(500); // Start Access Point WiFi.mode(WIFI_AP); WiFi.softAP(AP_SSID, AP_PASSWORD); Serial.println("Access Point started"); Serial.print("SSID: "); Serial.println(AP_SSID); Serial.print("Password: "); Serial.println(AP_PASSWORD); Serial.print("Connect and open http://"); Serial.println(WiFi.softAPIP()); // Routes server.on("/", handleIndex); server.on("/api/forward", handleForward); server.on("/api/backward", handleBackward); server.on("/api/left", handleLeft); server.on("/api/right", handleRight); server.on("/api/stop", handleStop); server.begin(); Serial.println("HTTP server ready."); } void loop() { server.handleClient(); }