[KG_KAIROS] ESP32 보드 활용

https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers

CP210x USB to UART Bridge VCP Drivers - Silicon Labs

이거 다운 받으시고~

 

아두이노 라이브러리 esp 32다운받으시고

 

https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json

요고 링크 넣어주시면 됩니다.

 

그러면 port가 뜰거에요!~셋업 완료.

 

ESP32 와 I2C bus 사용하기

/*MIT License

Copyright (c) 2024 JD edu. http://jdedu.kr author: conner.jeong@gmail.com
     
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
     
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
     
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN TH
SOFTWARE.*/
#include "Adafruit_VL53L0X.h"

Adafruit_VL53L0X lox = Adafruit_VL53L0X();

void setup() {
  Serial.begin(115200);
  
  Serial.println("Adafruit VL53L0X test...");
  if (!lox.begin()) {
    Serial.println(F("Failed to boot VL53L0X"));
    while(1);
  }
  // power 
  Serial.println(F("VL53L0X test OK...")); 
}


void loop() {
  VL53L0X_RangingMeasurementData_t measure;
    
  Serial.print("Reading a measurement... ");
  lox.rangingTest(&measure, false); // pass in 'true' to get debug data printout!

  if (measure.RangeStatus != 4) {  // phase failures have incorrect data
    Serial.print("Distance (mm): "); Serial.println(measure.RangeMilliMeter);
  } else {
    Serial.println(" out of range ");
  }
    
  delay(100);
}

[ESP32] 자료정리 (Pin map) : 네이버 블로그 (naver.com)

[ESP32] 자료정리 (Pin map)

핀맵은 여길 참고 했습니다.

플로터를 띄울려면  Serial.print("Distance (mm): "); 를 주석처리합니다.

미션!! 부저를 울리는것!!

하지만 지금은 개같이 실패...

 

ESP32로 Socket통신하기!!

 

cmd창에서 ipconfig

와이파이 맞춰주고!!

#include <WiFi.h>

#define ssid  "ConnectValue_C402_2G"
#define password   "CVC402!@#$"

void setup() {
    Serial.begin(115200);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.println(".");
    }
    Serial.print("WiFi connected with IP:");
    Serial.println(WiFi.localIP());
}

void loop() {
    WiFiClient client;
    if(!client.connect(IPAddress(172,30,1,77), 10000)){    
    // if (!client.connect("192.168.1.68", 10000)) {          
        Serial.println("Connection to host failed");
        delay(1000);
        return;
    }
    //Serial.println("client connected sending packet");  
    if(Serial.available()>0){
        char c = Serial.read();
        if(c == 'a'){
            client.print("'a' is sent!");
        }else if(c == 'b'){
            client.print("'b' is sent!");
        }
    } 
    //client.print("Hello from ESP32!");
    client.stop();
    delay(100);
}

import socket

print("Creating server...")
s = socket.socket()
s.bind(('0.0.0.0', 10000))
s.listen(0)

while True:
    client, addr = s.accept()
    while True:
        content = client.recv(6)
        if len(content) == 0:
            client.send("uga".encode())
            break
        else:
            print(content.decode())
    #print("Closing connection")
    client.close()

서버를 먼저 켜주고

esp32에서 업로드해주십쇼. 그리고 시리얼모니터에서 a키를 누르면 vs코드 터미널에 보내진 문자를 확인 할 수 있습니다.

 

이번엔 와이파이로 연결합니다~

//https://shawnhymel.com/1675/arduino-websocket-server-using-an-esp32/
//  websockets library by Markus Sattler
#include <WiFi.h>
#include <WebSocketsServer.h>
#define ssid  "ConnectValue_C402_2G"
#define password   "CVC402!@#$"

WebSocketsServer webSocket = WebSocketsServer(80);

// Called when receiving any WebSocket message
void onWebSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length)
{

  // Figure out the type of WebSocket event
  switch(type) {

    // Client has disconnected
    case WStype_DISCONNECTED:
      Serial.printf("[%u] Disconnected!\n", num);
      break;

    // New client has connected
    case WStype_CONNECTED:
      {
        IPAddress ip = webSocket.remoteIP(num);
        Serial.printf("[%u] Connection from ", num);
        Serial.println(ip.toString());
      }
      break;

    // Echo text message back to client
    case WStype_TEXT:
      Serial.printf("[%u] Text: %s\n", num, payload);
      webSocket.sendTXT(num, payload);
      break;

    // For everything else: do nothing
    case WStype_BIN:
    case WStype_ERROR:
    case WStype_FRAGMENT_TEXT_START:
    case WStype_FRAGMENT_BIN_START:
    case WStype_FRAGMENT:
    case WStype_FRAGMENT_FIN:
    default:
      break;
  }
}

void setup() {
  // Start Serial port
  Serial.begin(115200);
  // Connect to access point
  Serial.println("Connecting");
  WiFi.begin(ssid, password);
  while ( WiFi.status() != WL_CONNECTED ) {
    delay(500);
    Serial.print(".");
  }
  // Print our IP address
  Serial.println("Connected!");
  Serial.print("My IP address: ");
  Serial.println(WiFi.localIP());
  // Start WebSocket server and assign callback
  webSocket.begin();
  webSocket.onEvent(onWebSocketEvent);
}

void loop() {

  // Look for and handle WebSocket data
  webSocket.loop();
}

 

아두이노에서 연결

import sys
import websocket

# Connect to WebSocket server
ws = websocket.WebSocket()
ws.connect("ws://172.30.1.46")
print("Connected to WebSocket server")

# Ask the user for some input and transmit it
str = input("Say something: ")
ws.send(str)

# Wait for server to respond and print it
result = ws.recv()
print("Received: " + result)

# Gracefully close WebSocket connection
ws.close()

가끔 vscode에서 import가 잘 안될때 있는데 그럴땐

view 들어가셔서 select interpreter 인터프리터가 제대로 설정되어있는지 확인해보세요!!!

저는 파이썬이 3개 깔려서 안됐네요.

 

 

AP모드 사용하기

/*MIT License

Copyright (c) 2024 JD edu. http://jdedu.kr author: conner.jeong@gmail.com
     
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
     
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
     
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN TH
SOFTWARE.*/
#include <WiFi.h>
#include <WebServer.h>

#define M1_B    26
#define M1_A    27

#define FORWARD   1
#define BACKWARD  2
#define STOP      3

/* Put your SSID & Password */
const char* ssid = "lhj esp32";  // Enter SSID here
const char* password = "123456789";  //Enter Password here

/* Put IP Address details */
IPAddress local_ip(192,168,1,1);
IPAddress gateway(192,168,1,1);
IPAddress subnet(255,255,255,0);

int motor_status = STOP;

WebServer server(80);

void go_forward(){
  Serial.println("forward");
  digitalWrite(M1_A, LOW);
  digitalWrite(M1_B, HIGH);
}

void go_backward(){
  Serial.println("backward");
  digitalWrite(M1_A, HIGH);
  digitalWrite(M1_B, LOW);
}

void stop(){
  Serial.println("stop");
  digitalWrite(M1_A, LOW);
  digitalWrite(M1_B, LOW);
  delay(200);
}

void setup() {
  Serial.begin(115200);

  pinMode(M1_A, OUTPUT);
  pinMode(M1_B, OUTPUT);
  stop();

  WiFi.softAP(ssid, password);
  WiFi.softAPConfig(local_ip, gateway, subnet);
  delay(100);
  
  server.on("/", handle_OnConnect);
  server.on("/forward", handle_forward);
  server.on("/backward", handle_backward);
  server.on("/stop", handle_stop);
  server.onNotFound(handle_NotFound);
  
  server.begin();
  Serial.println("HTTP server started");
}
void loop() {
  server.handleClient();
}

void handle_OnConnect() {
  stop();
  Serial.println("motor stop");
  server.send(200, "text/html", SendHTML(motor_status)); 
}

void handle_forward() {
  go_forward();
  motor_status = FORWARD;
  Serial.println("motor forward");
  server.send(200, "text/html", SendHTML(motor_status)); 
}

void handle_backward() {
  go_backward();
  motor_status = BACKWARD;
  Serial.println("motor backward");
  server.send(200, "text/html", SendHTML(motor_status)); 
}

void handle_stop() {
  stop();
  motor_status = STOP;
  Serial.println("motor stop");
  server.send(200, "text/html", SendHTML(motor_status)); 
}

void handle_NotFound(){
  server.send(404, "text/plain", "Not found");
}

String SendHTML(uint8_t motor_status){
  String ptr = "<!DOCTYPE html> <html>\n";
  ptr +="<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, user-scalable=no\">\n";
  ptr +="<title>LED Control</title>\n";
  ptr +="<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}\n";
  ptr +="body{margin-top: 50px;} h1 {color: #444444;margin: 50px auto 30px;} h3 {color: #444444;margin-bottom: 50px;}\n";
  ptr +=".button {display: block;width: 80px;background-color: #3498db;border: none;color: white;padding: 13px 30px;text-decoration: none;font-size: 25px;margin: 0px auto 35px;cursor: pointer;border-radius: 4px;}\n";
  ptr +=".button-on {background-color: #3498db;}\n";
  ptr +=".button-on:active {background-color: #2980b9;}\n";
  ptr +=".button-off {background-color: #34495e;}\n";
  ptr +=".button-off:active {background-color: #2c3e50;}\n";
  ptr +="p {font-size: 14px;color: #888;margin-bottom: 10px;}\n";
  ptr +="</style>\n";
  ptr +="</head>\n";
  ptr +="<body>\n";
  ptr +="<h1>ESP32 Web Server</h1>\n";
  ptr +="<h3>Using Access Point(AP) Mode</h3>\n";

  switch(motor_status){
    case 1:
      {ptr +="<p>Motor forward</p><a class=\"button button-on\" href=\"/forward\">ON</a>\n";}
      {ptr +="<p>Motor backward</p><a class=\"button button-off\" href=\"/backward\">OFF</a>\n";}
      {ptr +="<p>stop</p><a class=\"button button-off\" href=\"/stop\">OFF</a>\n";}
      break;
    case 2:
      {ptr +="<p>Motor forward</p><a class=\"button button-off\" href=\"/forward\">OFF</a>\n";}
      {ptr +="<p>Motor backward</p><a class=\"button button-on\" href=\"/backward\">ON</a>\n";}
      {ptr +="<p>stop</p><a class=\"button button-off\" href=\"/stop\">OFF</a>\n";}
      break;
    case 3:
      {ptr +="<p>Motor forward</p><a class=\"button button-off\" href=\"/forward\">OFF</a>\n";}
      {ptr +="<p>Motor backward</p><a class=\"button button-off\" href=\"/backward\">OFF</a>\n";}
      {ptr +="<p>stop</p><a class=\"button button-on\" href=\"/stop\">ON</a>\n";}
      break;
  }
  ptr +="</body>\n";
  ptr +="</html>\n";
  return ptr;
}