ESP32_i2c_Si7021_oled_3

/*
 ESP32+ OLED 0.96 (SSD1306) +dht11
 Author  : Kouji Nakashima / kuc-arc-f.com
 date    : 2017/03/08
 SDA: #21, SCL: #22 connect.
 thanks:
 https://github.com/pcbreflux/espressif/tree/master/esp32/arduino/sketchbook/ESP32_i2c_Si7021_oled
 u8g2 LIB: https://github.com/olikraus/u8g2
*/
#include <U8g2lib.h>
#include <Wire.h>

//U8G2_SSD1306_128X32_UNIVISION_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);   // Adafruit Feather ESP8266/32u4 Boards + FeatherWing OLED
U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);  // Adafruit ESP8266/32u4/ARM Boards + FeatherWing OLED
//U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);   // All Boards without Reset of the Display

/* Common addresses definition for temperature sensor. */
#include <DHT.h>

#define DHTPIN 14     // what digital pin we're connected to
#define DHTTYPE DHT11   // DHT 11

DHT dht(DHTPIN, DHTTYPE);
static int pos;

//
void setup() {
    Serial.begin(115200);
    dht.begin();
    pos=0;

    u8g2.begin();
}
//
void proc_display(float humi, float temp){
//  static float humi, temp;
  String stringOut;
  char buf[512];
  char degree = 0xB0;
  if (pos%4==0) { // Heardbeat
    u8g2.drawDisc(122,28,3);
    u8g2.sendBuffer();          // transfer internal memory to the display
  }
  
//  humi= 38.5;
//  temp= 17.6;
  
  stringOut = "";
  stringOut += dtostrf(humi, 3, 1, buf);
  stringOut += "% ";
  stringOut += dtostrf(temp, 3, 1, buf);
  stringOut += degree;
  stringOut += "C";

  stringOut.getBytes((unsigned char *)buf, 512, 0);

  Serial.print(pos++);
  Serial.print(" ");
  Serial.println(buf);

  u8g2.clearBuffer();          // clear the internal memory
  u8g2.setFont(u8g2_font_10x20_tf);
  u8g2.drawStr(0,20,buf);  // write to the internal memory
  u8g2.drawBox(0,26,humi,6);
  u8g2.drawFrame(0,26,100,6);
  u8g2.sendBuffer();          // transfer internal memory to the display

}

uint32_t mTimerTemp=0;
//
void loop() {
  if( millis() > mTimerTemp ){
        mTimerTemp= millis() + 1000;
        float fHum = dht.readHumidity();
        float fTmp = dht.readTemperature();
        if (isnan(fHum ) || isnan(fTmp ) ) {
          Serial.println("Failed to read from DHT sensor!");
          return;
        }
        proc_display(fHum, fTmp  );
  }

  //delay(1000);  
}