作りながら学ぶArduino+=電子工作入門

#include <Wire.h>

void setup(){
  Wire.begin();

  Serial.begin(115200);
  while (!Serial);             // Leonardo: wait for serial monitor
  Serial.println("\nI2C Scanner");
}

void loop(){
  byte error, address;
  int nDevices;
 
  Serial.println("Scanning...");
 
  nDevices = 0;
  for(address = 1; address < 127; address++ )
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0){
      Serial.print("I2C device found at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");

      nDevices++;
    }
    else if (error==4){
      Serial.print("Unknown error at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.println(address,HEX);
    }    
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");
 
  delay(5000);           // wait 5 seconds for next scan
}

/* Copyright (c) 2018 Seeed Technology Co., Ltd.
 * Website    : www.seeed.cc
 * Author     : downey
 * Create Time: May 2018
 * 2013 Copyright (c) Seeed Technology Inc.  All right reserved.
 * Author:Loovee
 * 2013-9-18
 */

#include "Seeed_SHT35.h"
#include 
#include "rgb_lcd.h"
#define SCLPIN  A5
SHT35 sensor(SCLPIN);
rgb_lcd lcd;

const int colorR = 50;
const int colorG = 150;
const int colorB = 150;

void setup(){
    Serial.begin(115200);
    delay(10);
    Serial.println("serial start!!");
    if(sensor.init()){
      Serial.println("sensor init failed!!!");
    }
    lcd.begin(16, 2);
    lcd.setRGB(colorR, colorG, colorB);
    lcd.print("hello, world!");
    delay(1000);
}

void loop(){
    u16 value=0;
    u8 data[6]={0};
    float temp,hum;
    if(NO_ERROR!=sensor.read_meas_data_single_shot(HIGH_REP_WITH_STRCH,&temp,&hum)){
      Serial.println("read temp failed!!");
    }
    else{
      Serial.println("read data :");
      Serial.print("temperature = ");
      Serial.print(temp);
	  Serial.println(" ℃ ");

      Serial.print("humidity = ");
      Serial.print(hum);
	  Serial.println(" % ");

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("temp =");
    lcd.print(temp);
    lcd.setCursor(0, 1);
    lcd.print("humi =");
    lcd.print(hum);
    }
    delay(1000);
}