先日OLEDの文字表示できたが、今度 I2Cに (BMP180+OLED)両方を繋いで、センサーデータの表示を試み。

たまたま、この種類のBMP180とOLEDの結線順番は同じだから、４本線だけで済む。

プログラム

/*
 * 
 */
#include <Wire.h> 
#include <Adafruit_BMP085.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
 
#define OLED_RESET 0  // GPIO0
Adafruit_SSD1306 OLED(OLED_RESET);

Adafruit_BMP085 bmp;

void setup()
{
  OLED.begin();
  OLED.clearDisplay();
 
  //Add stuff into the 'display buffer'
  OLED.setTextWrap(false);
  OLED.setTextSize(1);
  OLED.setTextColor(WHITE);
  OLED.setCursor(0,0);
  OLED.println("automatedhome.party");
 
  OLED.display(); //output 'display buffer' to screen  
  // OLED.startscrollleft(0x00, 0x0F); //make display scroll 

  if (!bmp.begin()) 
  {
    Serial.println("Could not find BMP180 or BMP085 sensor at 0x77");
    while (1) {}
  }
}

void loop()
{

  OLED.clearDisplay();
  OLED.setCursor(0,0);
  OLED.print("Temp = ");
  OLED.print(bmp.readTemperature());
  OLED.println(" Celsius");
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  OLED.setCursor(0,8);
  OLED.print("Pres = ");
  OLED.print(bmp.readPressure());
  OLED.println(" Pascal ");
  // print the number of seconds since reset:
  OLED.setCursor(0,16);
  OLED.print(millis() / 1000);
  OLED.display(); //output 'display buffer' to screen  
}

 

 

BMP280気圧センサーとNikia 5110同時に使うため、SPIで通信する環境を作って試したが、相性が悪いようだ。

どちらでも単独では動くが、一緒になると、表示がうあくいかない。

そこで、DHT22という温度湿度を試して見ることに。I2C,SPIどちらでもないので、相性が問題ならないと思う。

これは成功

/* Hello World
 * Display a simple message on the first line of the screen
 *
 * Connections:
 * WeMos D1 Mini   Nokia 5110    Description
 * (ESP8266)       PCD8544 LCD
 *
 * D2 (GPIO4)      0 RST         Output from ESP to reset display
 * D1 (GPIO5)      1 CE          Output from ESP to chip select/enable display
 * D6 (GPIO12)     2 DC          Output from display data/command to ESP
 * D7 (GPIO13)     3 Din         Output from ESP SPI MOSI to display data input
 * D5 (GPIO14)     4 Clk         Output from ESP SPI clock
 * 3V3             5 Vcc         3.3V from ESP to display
 * D0 (GPIO16)     6 BL          3.3V to turn backlight on, or PWM
 * G               7 Gnd         Ground
 *
 * Dependencies:
 * https://github.com/adafruit/Adafruit-GFX-Library
 * https://github.com/adafruit/Adafruit-PCD8544-Nokia-5110-LCD-library
 * - This pull request adds ESP8266 support:
 * - https://github.com/adafruit/Adafruit-PCD8544-Nokia-5110-LCD-library/pull/27
 */

#include <Arduino.h>

#include <Wire.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_PCD8544.h>

// Pins
const int8_t RST_PIN = D2;
const int8_t CE_PIN = D1;
const int8_t DC_PIN = D6;
//const int8_t DIN_PIN = D7;  // Uncomment for Software SPI
//const int8_t CLK_PIN = D5;  // Uncomment for Software SPI
const int8_t BL_PIN = D0;


// Software SPI with explicit CE pin.
// Adafruit_PCD8544 display = Adafruit_PCD8544(CLK_PIN, DIN_PIN, DC_PIN, CE_PIN, RST_PIN);

// Software SPI with CE tied to ground. Saves a pin but other pins can't be shared with other hardware.
// Adafruit_PCD8544(int8_t CLK_PIN, int8_t DIN_PIN, int8_t DC_PIN, int8_t RST_PIN);

// Hardware SPI based on hardware controlled SCK (SCLK) and MOSI (DIN) pins. CE is still controlled by any IO pin.
// NOTE: MISO and SS will be set as an input and output respectively, so be careful sharing those pins!
Adafruit_PCD8544 display = Adafruit_PCD8544(DC_PIN, CE_PIN, RST_PIN);

#include "DHT.h"
#define DHTPIN D4     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)
 
DHT dht(DHTPIN, DHTTYPE);
 
void setup() {
  Serial.begin(9600);
  Serial.println("\n\nWeMos D1 Mini + Nokia 5110 PCD8544 84x48 Monochrome LCD\nUsing Adafruit_PCD8544 and Adafruit_GFX libraries\n");

  // Turn LCD backlight on
  pinMode(BL_PIN, OUTPUT);
  digitalWrite(BL_PIN, HIGH);

  display.begin();
  display.setContrast(60);  // Adjust for your display
  Serial.println("Show Adafruit logo bitmap");

  // Show the Adafruit logo, which is preloaded into the buffer by their library
  // display.clearDisplay();
  delay(2000);

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(BLACK);
  display.setCursor(0,0);
  display.println("Hello, world!");
  display.display();
  Serial.println("You should now see Hello, world! on the display");

  dht.begin();
}

void loop() {

    // Wait a few seconds between measurements.
  delay(2000);
 
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);
 
  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) 
  {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
 
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(BLACK);

  display.setCursor(0, 0);
  display.println("Humidity: ");

  display.print(h);
  display.println(" %\t");

  display.println("Temperature: ");

  display.print(t);
  display.println(" *C ");
  display.print(f);
  display.println(" *F");
  display.display();
  
}

表示も大丈夫。

しかし、SPIのNikia 5110と、他のI2C,SPIデバイスと共存できないかな？

 

 

Specification

• Pressure sensing range: 300-1100 hPa (9000m to -500m above sea level)
• Up to 0.03hPa / 0.25m resolution
• -40 to +85°C operational range, +-2°C temperature accuracy

Wiring

Make the following connections

• GND <-> GND
• 3V3 <-> VIN (or 3Vo)
• D1 <-> SCL
• D2 <-> SDA

ライブラリの追加

“Adafruit Unified Sensor”ライブラリの追加

センサーをライブラリ追加

BMP180センサーを利用する

ライブラリからBMP085を検索して、追加してください

単体プログラム

ただシリアルモニタに表示するだけのプログラム

#include <Wire.h>
#include <Adafruit_BMP085.h>
 
Adafruit_BMP085 bmp;
 
void setup() 
{
  Serial.begin(9600);
  //Wire.begin (4, 5);
  if (!bmp.begin()) 
  {
    Serial.println("Could not find BMP180 or BMP085 sensor at 0x77");
    while (1) {}
  }
}
 
void loop() 
{
  Serial.print("Temperature = ");
  Serial.print(bmp.readTemperature());
  Serial.println(" Celsius");
 
  Serial.print("Pressure = ");
  Serial.print(bmp.readPressure());
  Serial.println(" Pascal");
 
 
  Serial.println();
  delay(5000);
}

1602に表示するプログラム

/*
 * 
 */
#include <Wire.h> 
#include <Adafruit_BMP085.h>
#include <LiquidCrystal_I2C.h>

Adafruit_BMP085 bmp;

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup()
{
  lcd.begin(0,2);  // sda=GPIO_0, scl=GPIO_2

  lcd.init();

  // Turn on the backlight.
  lcd.backlight();
    
  // Print a message to the LCD.
  lcd.print("hello, world!");

  if (!bmp.begin()) 
  {
    Serial.println("Could not find BMP180 or BMP085 sensor at 0x77");
    while (1) {}
  }
}

void loop()
{

  lcd.setCursor(0, 0);
  lcd.print("Temp = ");
  lcd.print(bmp.readTemperature());
  lcd.println(" Celsius");
     
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print("Pres = ");
  lcd.print(bmp.readPressure());
  lcd.print(" Pascal ");
  lcd.print(millis() / 1000);
}

表示画面