Add projects/espnow/rc car/transmitter/transmitter.ino

projects/espnow/rc car/transmitter/transmitter.ino

@@ -0,0 +1,51 @@
+#include <WiFi.h>
+#include <esp_now.h>
+
+// MAC address of the car unit
+uint8_t carAddr[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
+
+typedef struct {
+  int speed;     // -255 (reverse) to 255 (forward)
+  int direction; // -100 (left) to 100 (right)
+} CommandPacket;
+
+typedef struct {
+  int currentSpeed;
+  int batteryVoltage; // e.g., millivolts
+  int temperature;    // Celsius
+} TelemetryPacket;
+
+TelemetryPacket telemetry;
+
+void onTelemetryRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {
+  memcpy(&telemetry, incomingData, sizeof(telemetry));
+  Serial.print("Car Speed: "); Serial.println(telemetry.currentSpeed);
+  Serial.print("Batt Voltage: "); Serial.println(telemetry.batteryVoltage);
+  Serial.print("Temperature: "); Serial.println(telemetry.temperature);
+}
+
+void setup() {
+  Serial.begin(115200);
+  WiFi.mode(WIFI_STA);
+  if (esp_now_init() != ESP_OK) {
+    Serial.println("ESP-NOW init failed!");
+    return;
+  }
+  esp_now_peer_info_t peerInfo;
+  memcpy(peerInfo.peer_addr, carAddr, 6);
+  peerInfo.channel = 0;
+  peerInfo.encrypt = false;
+  esp_now_add_peer(&peerInfo);
+
+  esp_now_register_recv_cb(onTelemetryRecv);
+}
+
+void loop() {
+  CommandPacket cmd;
+  // Example: Read joystick/button to determine speed/direction
+  cmd.speed = analogRead(34) - 2048;     // Map your analog input to desired speed
+  cmd.direction = analogRead(35) - 2048; // Map to direction: left/right
+
+  esp_now_send(carAddr, (uint8_t*)&cmd, sizeof(cmd));
+  delay(100); // Adjust send rate as needed
+}