土壌水分計の制作 続き

ESP8266は使い勝手が良く、結構思ったことが簡単に実現できるので気に入ってます。
今回は、測定値を表示するためのI2CDisplayとWiFiのアドレスやデータの校正情報を個別に保存できるようにSDカードの接続を実験してみました。
I2CもSDカードも実にすんなり使うことが出来るようになりましたが、肝心のBaffaloの無線LanのルーターがDHCPを出してくれないので、ここでとん挫。　 Failed status 37って何ですか？　reason code とかstatus codeがLogに吐き出されますが、これらのコードの説明が見つからないために中断です。
I2CとSPIを使い、尚且つToutを使ったADCに、更に温度計と水分計の切り替えの為の１ポートと、目いっぱいの利用で、左のような接続で実験していますが、問題はないようです。
SDカードの読み出しは
myfile = SD.open()
myfile.read()
しかないようなので、一文字ずつバッファに書き出してゆくまどろっこしいコードになりますね。
コメントアウトした部分（未完成）も含めて、備忘録としてアップしておくことにします。

 I2CDisplay_update.ino

/*

 *  The circuit:

 * SD card attached to SPI bus as follows:

 ** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila

 ** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila

 ** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila

 ** CS - depends on your SD card shield or module.

    Pin 4 used here for consistency with other Arduino examples

 */

#include

extern "C" {

  #include "user_interface.h"

}

#include

#include

#include

#include

Sd2Card card;

const int chipSelect = 2; // IO2 not IO4

ST7032 lcd;

char ssid[30] = "*********************";

char password[30] = "#####################";

char Id[20] = "$$$$$$$$$$$$$$$$$$$";

char host[20] = "?????????????"; // host address ie. 192.168.100.100

File myFile;

float offset = 0.424;

float v = 0.0;

float temp = 0.0;

float vc = 0.00625;

float vref = 1.0;

void setup() {

  Serial.begin(115200);

  delay(10);

  byte mac_addr[6];

  WiFi.macAddress(mac_addr);

  char buff[20];

  Serial.print("Mac address: ");

  sprintf(buff, "%02X:%02X:%02X:%02X:%02X:%02X",

    mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4], mac_addr[5]);

  Serial.println(buff);　　// Check MAC address

  Serial.print("Initializing SD card...");

  if (!SD.begin(chipSelect)) {

    Serial.println("initialization failed!");

    return;

  }

  Serial.println("initialization done.");

  Serial.println("");

  Serial.println("Started");

  // Read ssid, password, Id from SD card and put 'em to global variables

  read_ssid();

  read_password();

  read_Id();

  read_host();

  /*

  // First connect to WiFi

  Serial.print("Connecting to ");

  Serial.println(ssid); 

  WiFi.begin(ssid, password );

//  WiFi.begin("Baffalo-G-4CC0","65rhwri3nnee" );

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

  Serial.println("");

  Serial.println("WiFi connected");

  Serial.println("IP address: ");

  Serial.println(WiFi.localIP());

*/

  // Set up LCD display

  lcd.begin(8,2);

  lcd.setContrast(25);

  delay(40);

}

void loop() {

  // put your main code here, to run repeatedly:

  /*

  Serial.print("connecting to ");

  Serial.println(host);

  WiFiClient client;

  const int httpPort = 80;

  if (!client.connect(host, httpPort)){

    Serial.println("connection failed");

    return;

  }

  String url = "/weather/weather_log.php";

         url += "?location=" + String(Identifier); // ID to identify location

         url += "&temperature="+String(t);

         url += "&humidity=" +String(h);

         url += "&pressure=" +String(p);

  Serial.print("Requesting URL: ");

  Serial.println("GET "+url);

  client.print(String("GET ") + url + " HTTP/1.1\r\n" +

                "Host: " + host + "\r\n" +

                "Connection: close\r\n\r\n");

  delay(50);

  // Read all the lines of the reply from server and print them to Serial

  Serial.println("Returned message from server: ");

  while(client.available()){

    String line = client.readStringUntil('\r');

    Serial.print(line);

  }

  Serial.println();

  Serial.println("closing connection");

  */

  String s1;

  String s2 = "*******";

  int temp;

  temp = measure_temp();

  s1 =  String(temp) + " C";

  lcd.clear();

  lcd.setCursor(2,0);

  lcd.print(s1);

  lcd.setCursor(0,1);

  lcd.print(s2);

  Serial.println(" ====  Temp = " + s1 );

  delay(1000);

}

int measure_temp(){

  uint ADC_Value = 0;

  float temp = 0.0;

  int i;

  for(i = 0;i < 30; i++){

    ADC_Value = system_adc_read();

    v = float(ADC_Value)/1024.0 * vref;

    temp = temp + (v-offset) / vc;

    delay(30);

  }

  return (int)temp/30;

}

void read_ssid(){

   // open the file for reading:

  myFile = SD.open("ssid.txt", FILE_READ);

  char *s = ssid;

  if (myFile) {

    Serial.println("ssid.txt");

    // read from the file until there's nothing else in it:

    while (myFile.available()) {

      *s++ = myFile.read();

    }

    *s = '\0';

    // close the file:

    myFile.close();

    Serial.println(ssid );

  } else {

    // if the file didn't open, print an error:

    Serial.println("error opening ssid.txt");

  }

}

void read_password(){

  myFile = SD.open("password.txt");

  if (myFile) {

    Serial.println("password.txt");

    char *p = password;

    // read from the file until there's nothing else in it:

    while (myFile.available()) {

      *p++ = myFile.read();

    }

    *p = '\0';

    // close the file:

    myFile.close();

    Serial.println(password);

  } else {

    // if the file didn't open, print an error:

    Serial.println("error opening password.txt");

  }

}

void read_Id(){

  myFile = SD.open("Id.txt");

  char *p = Id;

  if (myFile) {

    Serial.println("id.txt");

    // read from the file until there's nothing else in it:

    while (myFile.available()) {

      *p++ = myFile.read();

    }

    *p = '\0';

    // close the file:

    myFile.close();

    Serial.println(Id);

  } else {I2c

    // if the file didn't open, print an error:

    Serial.println("error opening Id.txt");

  }

}  

void read_host(){

  myFile = SD.open("host.txt");

  char *p = Id;

  if (myFile) {

    Serial.println("host.txt");

    // read from the file until there's nothing else in it:

    while (myFile.available()) {

      *p++ = myFile.read();

    }

    *p = '\0';

    // close the file:

    myFile.close();

    Serial.println(host);

  } else {

    // if the file didn't open, print an error:

    Serial.println("error opening host.txt");

  }

}