(原) ESP-01 相关

之前冲动消费了几块ESP-01主板，原本考虑用于arduino芯片的网络化。最近梁总有需求远程开机，考虑给他用起。

EPS-01 在Arduino IDE中选择EPS-12，速率默认115200. 板载8个接线位分别是(板载天线正面，右方): TX (GPIO1) GND CH_PD GPIO2 GPIO16 GPIO0 VCC RX(GPIO3)

GPIO0 默认悬空，表示工作模式。下载程序时接地

GPIO16 低电平表示复位（默认已拉高） 类似RST

CH_PD 高电平工作，低电平则关闭供电

GPIO2 开机必须高电平（默认已拉高）

借用几张网上的图片

这是网友画的关于开机的连接

使用中发现，即使连接和设置没有问题，也经常会出现不能上传的情况，多试几次就可以了。通过手动的拉低GPIO16让芯片重启，往往能让其有效上传。

测试中的代码如下，暂时还没有解决手机端，考虑使用微信或者网页。等待继电器测试。

使用中发现WebOTA不成功，总是提示出错，不知道为什么。暂时放过。

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <WiFiManager.h>
#include <ESP8266HTTPClient.h>

#define POWER_PIN  0
#define LED_PIN 2

const char* host = "ease";
const char* Ver = "0.3c";
const char* WebServer = "scwy.net";
const uint16_t port = 9090;
const uint16_t update_time = 10000;

bool led_status = false;
bool up_status = false;
uint32_t runTime = 0;

ESP8266WebServer server(80);
const char* serverIndex = "Ver:0.3c<br/><form method='POST' action='/update' enctype='multipart/form-data'><input type='file' name='update'><input type='submit' value='Update'></form>";

// 闪烁LED
void ShowLed(uint16_t otime,uint16_t ftime){
  digitalWrite(LED_PIN, LOW); delay(otime);  
  digitalWrite(LED_PIN, HIGH); delay(ftime);  
}

// 网络服务，包括Web更新固件
void setup_WebServer() {
    MDNS.begin(host);
 
    server.on("/", HTTP_GET, []() {
          server.sendHeader("Connection", "close");
          server.send(200, "text/html", serverIndex);
    });
    server.on("/update", HTTP_POST, []() {
          server.sendHeader("Connection", "close");
          server.send(200, "text/plain", (Update.hasError()) ? "FAIL" : "OK");
          delay(2000);
          ESP.restart();
    }, []() {
       HTTPUpload& upload = server.upload();
       if (upload.status == UPLOAD_FILE_START) {
          up_status = true;
          Serial.setDebugOutput(true);
          WiFiUDP::stopAll();
          Serial.printf("Update: %s\n", upload.filename.c_str());
          uint32_t maxSketchSpace = (ESP.getFreeSketchSpace() - 0x1000) & 0xFFFFF000;
          if (!Update.begin(maxSketchSpace)) { //start with max available size
            Update.printError(Serial);
          }
       } else if (upload.status == UPLOAD_FILE_WRITE) {
          if (Update.write(upload.buf, upload.currentSize) != upload.currentSize) {
            Update.printError(Serial);
          }
       } else if (upload.status == UPLOAD_FILE_END) {
          if (Update.end(true)) { //true to set the size to the current progress
            Serial.printf("Update Success: %u\nRebooting...\n", upload.totalSize);
          } else {
            Update.printError(Serial);
          }
          Serial.setDebugOutput(false);
       }
       yield();
    });
    
    server.begin();
    MDNS.addService("http", "tcp", 80);  
}

// 通过Web页，设置wifi
void steup_Wifi(){
    WiFiManager wifiManager;
    //wifiManager.setDebugOutput(false);

    if (!wifiManager.autoConnect()) {
        Serial.println("连接超时");
    }
    Serial.println("连接wifi成功");
}

// 通过WEB获取计算机机状态
void get_Command() {
    WiFiClient client;
    HTTPClient http;    
    
    if (http.begin(client, "http://scwy.net:9090/pc/get/1")) {  // HTTP

      int httpCode = http.GET();
      if (httpCode > 0) {
          Serial.printf("[HTTP] GET... code: %d\n", httpCode);
          if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
              String payload = http.getString();
              Serial.println(payload);
              if(payload=="1"){
                  digitalWrite(POWER_PIN, HIGH);
                  delay(200);
                  digitalWrite(POWER_PIN, LOW);
              }
          }
      } else {
          Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
      }

      http.end();
    } else {
      Serial.printf("[HTTP} Unable to connect\n");
    }
}

void setup() {
    Serial.begin(115200);
    uint8_t num = 0;
    pinMode(POWER_PIN, OUTPUT);
    pinMode(LED_PIN, OUTPUT);    
    Serial.print("\n当前版本:");Serial.println(Ver);
    
    steup_Wifi(); 
    setup_WebServer(); // 连接了网络才会运行Web服务 
    Serial.printf("Ready! Open http://%s.local in your browser\n", host);
    runTime = millis() + update_time;
}

void loop() {  
  server.handleClient();
  if(up_status)return;           //在更新固件时，不运行其它功能
  MDNS.update();
    
  // 状态灯  
  if(millis() % 500 == 0) {
      if(led_status){
        digitalWrite(LED_PIN, LOW);
      } else {
        digitalWrite(LED_PIN, HIGH);
      }
      led_status = not led_status;   
  }

  //每x秒钟查询一次状态
  if(runTime<millis()){
      get_Command();
      runTime = millis() + update_time;  
  }
  
  delay(100);
}