knaka Tech-blog: 7月 2016

2016年7月16日土曜日

OLED+ BME280で、天気情報の表示。

0.96インチ, 128×64 OLED(有機EL) を入手できたので、
BME280センサと組合せて、esp8266経由で
クラウド連携試してみました。

表示内容：　２パターン
1)
１行目：気温
２行目：湿度(%)
2)
気圧(hPa)

通信：　I2C　のみで制御

*) OLEDは、eBayさんから入手しました。

# 動画　：　センサー値はクラウド側へ送信

# クラウド側、ログ

# 表示側の基板
I2Cラインを引きまわして、esp8266からは
４本の配線。

*) BME配線は、LCD版とほぼ同じです。

# 配線

# ドライバ

	/*
	OLED 0.96 inch+ BME280
	with esp8266

	OLED:
	https://github.com/squix78/esp8266-oled-ssd1306
	*/

	#include <Wire.h>
	#include <BME280_MOD-1022.h>
	#include "SSD1306.h"

	#include <ESP8266WiFi.h>
	//#include <WiFiClient.h>

	//
	SSD1306 display(0x3c, 4, 5);

	const char* ssid = "";
	const char* password = "";

	const char* mHost = "api.thingspeak.com";
	const char* mHostTime = "";
	String mAPI_KEY="your-KEY";
	String mTimeStr="0000";

	float mTemp=0;
	float mHumidity=0;
	float mPressure=0;

	uint32_t mNextHttp= 30000;
	uint32_t mTimerTmpInit=30000;
	uint32_t mTimerDisp;
	uint32_t mTimerTime;
	uint32_t mTimerTemp;

	// Arduino needs this to pring pretty numbers
	void printFormattedFloat(float x, uint8_t precision) {
	char buffer[10];

	dtostrf(x, 7, precision, buffer);
	Serial.print(buffer);

	}

	// print out the measurements
	void printCompensatedMeasurements(void) {

	//float temp, humidity, pressure, pressureMoreAccurate;
	float pressureMoreAccurate;
	double tempMostAccurate, humidityMostAccurate, pressureMostAccurate;
	char buffer[80];

	mTemp = BME280.getTemperature();
	mHumidity = BME280.getHumidity();
	mPressure = BME280.getPressure();

	pressureMoreAccurate = BME280.getPressureMoreAccurate(); // t_fine already calculated from getTemperaure() above

	tempMostAccurate = BME280.getTemperatureMostAccurate();
	humidityMostAccurate = BME280.getHumidityMostAccurate();
	pressureMostAccurate = BME280.getPressureMostAccurate();
	}

	//
	void init_BME280(){
	uint8_t chipID;

	//Serial.println("Welcome to the BME280 MOD-1022 weather multi-sensor test sketch!");
	//Serial.println("Embedded Adventures (www.embeddedadventures.com)");
	chipID = BME280.readChipId();

	// find the chip ID out just for fun
	Serial.print("ChipID = 0x");
	Serial.print(chipID, HEX);

	// need to read the NVM compensation parameters
	BME280.readCompensationParams();

	// Need to turn on 1x oversampling, default is os_skipped, which means it doesn't measure anything
	BME280.writeOversamplingPressure(os1x); // 1x over sampling (ie, just one sample)
	BME280.writeOversamplingTemperature(os1x);
	BME280.writeOversamplingHumidity(os1x);

	// example of a forced sample. After taking the measurement the chip goes back to sleep
	BME280.writeMode(smForced);
	while (BME280.isMeasuring()) {
	Serial.println("Measuring...");
	delay(50);
	}
	Serial.println("Done!");

	// read out the data - must do this before calling the getxxxxx routines
	BME280.readMeasurements();
	// Example for "indoor navigation"
	// We'll switch into normal mode for regular automatic samples
	BME280.writeStandbyTime(tsb_0p5ms); // tsb = 0.5ms
	BME280.writeFilterCoefficient(fc_16); // IIR Filter coefficient 16
	BME280.writeOversamplingPressure(os16x); // pressure x16
	BME280.writeOversamplingTemperature(os2x); // temperature x2
	BME280.writeOversamplingHumidity(os1x); // humidity x1

	BME280.writeMode(smNormal);
	}

	//
	void proc_http(String sTemp, String sHum, String sPre){
	//Serial.print("connecting to ");
	//Serial.println(mHost);
	WiFiClient client;
	const int httpPort = 80;
	if (!client.connect(mHost, httpPort)) {
	Serial.println("connection failed");
	return;
	}
	String url = "/update?key="+ mAPI_KEY + "&field1="+ sTemp +"&field2=" + sHum+ "&field3="+sPre;
	client.print(String("GET ") + url + " HTTP/1.1\r\n" +
	"Host: " + mHost + "\r\n" +
	"Connection: close\r\n\r\n");
	delay(10);
	int iSt=0;
	while(client.available()){
	String line = client.readStringUntil('\r');
	//Serial.print(line);
	}
	}

	//
	void setup() {
	Serial.begin(9600);
	mTimerTemp= mTimerTmpInit;
	Wire.begin();
	Serial.println("#setup-Start");
	init_BME280();

	Serial.println();
	Serial.println();
	Serial.print("Connecting to ");
	Serial.println(ssid);
	WiFi.begin(ssid, password);
	while (WiFi.status() != WL_CONNECTED) {
	delay(500);
	Serial.print(".");
	}
	Serial.println("");
	Serial.println("WiFi connected");

	//OLED
	display.init();
	display.flipScreenVertically();
	display.displayOn();
	display.clear();
	}

	//
	void display_OLED(String sTmp, String sHum, String sPre){
	sTmp="Temp:"+ sTmp+ " C";
	sHum="Hum :"+ sHum+ " %";
	sPre=sPre+ " hPa";
	display.setFont(ArialMT_Plain_24);
	display.setTextAlignment(TEXT_ALIGN_LEFT);
	display.drawString( 0, 0, sTmp );
	display.drawString( 0, 32, sHum );
	display.display();
	delay(2000);
	display.clear();

	//2
	display.drawString( 0, 0, "Pressure:");
	display.drawString( 0, 32, sPre );
	display.display();
	delay(2000);
	display.clear();
	}

	//
	void loop() {
	delay(100);
	while (BME280.isMeasuring()) {
	}
	String sTmp="";
	String sHum="";
	String sPre="";
	if (millis() > mTimerDisp) {
	mTimerDisp = millis()+ 3000;
	// read out the data - must do this before calling the getxxxxx routines
	BME280.readMeasurements();
	printCompensatedMeasurements();
	int itemp =(int)mTemp;
	int iHum = (int)mHumidity;
	int iPress = (int)mPressure;
	Serial.print("dat=");
	char cTemp[4+1];
	char cHum[4+1];
	char cPres[4+1];
	sprintf(cTemp, "%04d", itemp);
	sprintf(cHum, "%04d", iHum);
	sprintf(cPres, "%04d", iPress);
	Serial.print(cTemp);
	Serial.print(cHum);
	Serial.println(cPres);
	sTmp= String(itemp);
	sHum= String( iHum);
	sPre= String( iPress);
	display_OLED(sTmp, sHum, sPre);
	//Serial.println( millis() );
	} // if_timeOver
	if (millis() > mTimerTemp) {
	mTimerTemp = millis()+ mNextHttp+ mTimerTmpInit;
	int itemp =(int)mTemp;
	int iHum = (int)mHumidity;
	int iPress = (int)mPressure;
	sTmp=String(itemp);
	sHum=String(iHum);
	sPre=String(iPress);
	proc_http(sTmp, sHum, sPre);
	delay(100 );
	}
	}