#include <WiFi.h>
#include <PubSubClient.h>
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "broker.hivemq.com";
WiFiClient espClient;
PubSubClient client(espClient);
const int IN1 = 4, IN2 = 16, IN3 = 17, IN4 = 5;
void setup_wifi() {
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) delay(500);
}
void moveStepper(int steps, int direction) {
for (int i = 0; i < steps; i++) {
int step = (direction == 1) ? i % 4 : 3 - (i % 4);
digitalWrite(IN1, step == 0 || step == 3);
digitalWrite(IN2, step == 1 || step == 2);
digitalWrite(IN3, step == 0 || step == 1);
digitalWrite(IN4, step == 2 || step == 3);
delay(10);
}
}
void callback(char* topic, byte* payload, unsigned int length) {
String message = "";
for (int i = 0; i < length; i++) message += (char)payload[i];
if (message == "start" || message == "forward") moveStepper(100, 1);
else if (message == "reverse") moveStepper(100, -1);
else if (message == "stop") {
digitalWrite(IN1, LOW); digitalWrite(IN2, LOW);
digitalWrite(IN3, LOW); digitalWrite(IN4, LOW);
}
}
void reconnect() {
while (!client.connected()) {
if (client.connect("ESP32Motor")) client.subscribe("m/c");
else delay(5000);
}
}
void setup() {
for (int i = IN1; i <= IN4; i++) pinMode(i, OUTPUT);
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
void loop() {
if (!client.connected()) reconnect();
client.loop();
}