Arduino IDE sin IoT: Coche a control remoto

Más adelante verás un coche teledirigido con el móvil y usando internet.

Pero en este caso vamos a usar DOS ARDUINOS ALVIKS uno como receptor y otro con envío de órdenes

La fuente de este programa lo puedes encontrar en https://github.com/arduino-libraries/Arduino_Alvik/blob/main/examples/remote_control/remote_control.ino

Se graban los dos programas en los dos alviks, y al apretar OK uno es el que envía la órdenes y el otro le apretamos CANCEL y es el receptor

Es muy curioso que la comunicación lo hace via Wifi pero sin usar ningún punto de acceso exterior, sino entre ellos comunicación  pareada (peer)

/*
    This file is part of the Arduino_Alvik library.

    Copyright (c) 2024 Arduino SA

    This Source Code Form is subject to the terms of the Mozilla Public
    License, v. 2.0. If a copy of the MPL was not distributed with this
    file, You can obtain one at http://mozilla.org/MPL/2.0/.
    
*/

// This example shows how to interface 2 Alvik robots via ESPnow.
// At startup, you can select if an Alvik is a trasmitter by pressing the "check button" or a receiver by pressing "cancel button". Use arrows to move the robot.

#include "Arduino_Alvik.h"
#include <esp_now.h>
#include <WiFi.h>

Arduino_Alvik alvik;

uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
uint8_t myData;
esp_now_peer_info_t peerInfo;


int alvik_mode = -1; // 0 is receiver, 1 is sender

bool led_blink = false;


void setup() {
  Serial.begin(115200);
  while((!Serial)&&(millis()>3000));

  alvik.begin();

  WiFi.mode(WIFI_STA);
  if (esp_now_init() != ESP_OK) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }

  while (alvik_mode == -1){
    if (alvik.get_touch_cancel()){
      alvik_mode = 0;
    }
    if (alvik.get_touch_ok()){
      alvik_mode = 1;
    }
  }
  if (alvik_mode == 0){
    esp_now_register_recv_cb(OnDataRecv);
  }
  else{
    memcpy(peerInfo.peer_addr, broadcastAddress, 6);
    peerInfo.channel = 0;  
    peerInfo.encrypt = false;
  
    if (esp_now_add_peer(&peerInfo) != ESP_OK){
      Serial.println("Failed to add peer");
      return;
    }
  }
}

void loop() {
  if (alvik_mode==0){
    alvik.left_led.set_color(led_blink, !led_blink, 0);
    alvik.right_led.set_color(!led_blink, led_blink, 0);
    delay(500);
  }
  else{
    if (alvik.get_touch_any()){
      if (alvik.get_touch_up()){
        myData = 'F';
        esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
      }
      if (alvik.get_touch_down()){
        myData = 'B';
        esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
      }
      if (alvik.get_touch_left()){
        myData = 'L';
        esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
      }
      if (alvik.get_touch_right()){
        myData = 'R';
        esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
      }
      if (alvik.get_touch_center()){
        myData = 'S';
        esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
      }
    }
    alvik.left_led.set_color(0, 0, led_blink);
    alvik.right_led.set_color(0, 0, led_blink);
    delay(100);
  }
  led_blink = !led_blink;
}

void OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len){
  Serial.print(incomingData[0]);
  switch (incomingData[0]){
    case 'F':
      alvik.drive(7, 0);
      break;
    case 'B':
      alvik.drive(-7, 0);
      break;
    case 'L':
      alvik.drive(0, 45);
      break;
    case 'R':
      alvik.drive(0, -45);
      break;
    case 'S':
      alvik.brake();
      break;
  }
  Serial.println();
}

El resultado es expectacular