HDC1008 sensor readings displayed on a LCD4884 shield

Key Features

Parts List

Here are a list of parts that we used for this simple project

This is a slightly different LCD4884 shield than I have used previously but it works in exactly the same manner. The HDC1008 is an I2C sensor so is easy to connect to the shield.

LCD4884 shield and HDC1008

Code

You need to add the Adafruit GFX and PCD8544 libraries via the library manager. We did not use a library for the HDC1008 sensor

[codesyntax lang=”cpp”]

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


// Software SPI (slower updates, more flexible pin options):
// pin 7 - Serial clock out (SCLK)
// pin 6 - Serial data out (DIN)
// pin 5 - Data/Command select (D/C)
// pin 4 - LCD chip select (CS)
// pin 3 - LCD reset (RST)
Adafruit_PCD8544 display = Adafruit_PCD8544(2, 3, 4, 5, 6); //dfrobot lcd4884 shield

#define XPOS 0
#define YPOS 1
#define DELTAY 2
#define hdcAddr 0x40

void setup()   
{
  Serial.begin(9600);
  Wire.begin();             // join i2c bus (address optional for master) 
  display.begin();
  // Starts I2C communication
  Wire.beginTransmission(hdcAddr);
  // Select configuration register
  Wire.write(0x02);
  // Temperature, humidity enabled, resolultion = 14-bits, heater on
  Wire.write(0x30);
  // Stop I2C Transmission
  Wire.endTransmission();
  delay(300);
  // init done
  // you can change the contrast around to adapt the display
  display.setContrast(50);
  display.clearDisplay();   // clears the screen and buffer
  // text display tests
  display.setTextSize(1);
  display.setTextColor(BLACK);
  display.setCursor(0,0);
  display.setTextColor(WHITE, BLACK); // 'inverted' text
  display.println("HDC1008 TEST");
  display.display();
  delay(100);
}

 
void loop() 
{
  unsigned int data[2];

  Wire.beginTransmission(hdcAddr);
  // Send temp measurement command
  Wire.write(0x00);
  Wire.endTransmission();
  delay(500);

  // Request 2 bytes of data
  Wire.requestFrom(hdcAddr, 2);

  // Read 2 bytes of data for temperature
  if (Wire.available() == 2)
  {
    data[0] = Wire.read();
    data[1] = Wire.read();
  }

  int temp = (data[0] * 256) + data[1];
  float celsTemp = (temp / 65536.0) * 165.0 - 40;

  Wire.beginTransmission(hdcAddr);
  // Send humidity measurement command
  Wire.write(0x01);
  Wire.endTransmission();
  delay(500);

  // Request 2 bytes of data
  Wire.requestFrom(hdcAddr, 2);
  // Read 2 bytes of data to get humidity
  if (Wire.available() == 2)
  {
    data[0] = Wire.read();
    data[1] = Wire.read();
  }
  // Convert the data
  float humidity = (data[0] * 256) + data[1];
  humidity = (humidity / 65536.0) * 100.0;  
  
  // Display temperature
  display.setTextColor(BLACK, WHITE); // 'inverted' text
  display.setCursor(0,15);
  display.print(celsTemp,2);
  display.println(" C");
  display.print(humidity,2);
  display.println(" %");
  display.display();
 
}

[/codesyntax]