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？