Browse Source

Write simple display-based system to display temp & humidity with the NodeMCU 0.9

master
Starbeamrainbowlabs 1 year ago
parent
commit
3311b90db1
Signed by: sbrl GPG Key ID: 1BE5172E637709C2
6 changed files with 532 additions and 44 deletions
  1. +4
    -0
      .gitmodules
  2. +66
    -0
      EEITemperature/EEITemperature.ino
  3. +253
    -0
      EEITemperature/lib/HC_LiquidCrystal_I2C/HC_LiquidCrystal_I2C.cpp
  4. +164
    -0
      EEITemperature/lib/HC_LiquidCrystal_I2C/HC_LiquidCrystal_I2C.h
  5. +1
    -0
      EEITemperature/lib/esp8266-dht22
  6. +44
    -44
      Examples/LCDTest/LCDTest.ino

+ 4
- 0
.gitmodules View File

@ -8,3 +8,7 @@
path = dht22-esp8266/lib/esp8266-dht22
url = https://github.com/Defozo/esp8266-dht22.git
branch = patch-1
[submodule "EEITemperature/lib/esp8266-dht22"]
path = EEITemperature/lib/esp8266-dht22
url = https://github.com/Defozo/esp8266-dht22.git
branch = patch-1

+ 66
- 0
EEITemperature/EEITemperature.ino View File

@ -0,0 +1,66 @@
#include <Wire.h>
#include "lib/esp8266-dht22/dht22.h"
#include "lib/esp8266-dht22/dht22.c"
#include "lib/HC_LiquidCrystal_I2C/HC_LiquidCrystal_I2C.h"
#include "lib/HC_LiquidCrystal_I2C/HC_LiquidCrystal_I2C.cpp"
// ~~~
// LCD Display Settings
#define LCD_PIN_SDA 12
#define LCD_PIN_SCL 14
// DHT22 Settings
#define DHT_TYPE DHT22
// Pin D1 on the NodeMCU v0.9
#define DHT_PIN_DATA 5
// ~~~
HC_LiquidCrystal_I2C lcd(0x3F,20,4);
// ~~~
void dht_init() {
Serial.print("Initialising the DHT - ");
DHT_init(DHT_PIN_DATA, DHT_TYPE, 1);
DHT_begin();
Serial.println("done");
Serial.print("Waiting to warm DHT22 up - ");
delay(2000 - millis()); // Give the DHT22 time to warm up
}
void lcd_init() {
// Deprecated, but in this instance there's nothing we can do about it
// since we aren't running I2C over the default pins (default pins? what
// default pins?)
Wire.pins(LCD_PIN_SDA, LCD_PIN_SCL);
lcd.begin();
}
void setup() {
lcd_init();
dht_init();
}
void loop() {
lcd.backlight();
float temp, humidity;
lcd.setCursor(0, 0);
temp = readTemperature(false);
humidity = readHumidity();
lcd.print("Temperature: ");
lcd.print(temp);
lcd.print("C");
lcd.setCursor(0, 1);
lcd.print("Humidity: ");
lcd.print(humidity);
lcd.print("%");
delay(1000);
}

+ 253
- 0
EEITemperature/lib/HC_LiquidCrystal_I2C/HC_LiquidCrystal_I2C.cpp View File

@ -0,0 +1,253 @@
#include "HC_LiquidCrystal_I2C.h"
#include <inttypes.h>
#include <Arduino.h>
#include <Wire.h>
// When the display powers up, it is configured as follows:
//
// 1. Display clear
// 2. Function set:
// DL = 1; 8-bit interface data
// N = 0; 1-line display
// F = 0; 5x8 dot character font
// 3. Display on/off control:
// D = 0; Display off
// C = 0; Cursor off
// B = 0; Blinking off
// 4. Entry mode set:
// I/D = 1; Increment by 1
// S = 0; No shift
//
// Note, however, that resetting the Arduino doesn't reset the LCD, so we
// can't assume that its in that state when a sketch starts (and the
// LiquidCrystal constructor is called).
HC_LiquidCrystal_I2C::HC_LiquidCrystal_I2C(uint8_t lcd_addr, uint8_t lcd_cols, uint8_t lcd_rows, uint8_t charsize)
{
_addr = lcd_addr;
_cols = lcd_cols;
_rows = lcd_rows;
_charsize = charsize;
_backlightval = LCD_BACKLIGHT;
}
void HC_LiquidCrystal_I2C::begin() {
Wire.begin();
_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
if (_rows > 1) {
_displayfunction |= LCD_2LINE;
}
// for some 1 line displays you can select a 10 pixel high font
if ((_charsize != 0) && (_rows == 1)) {
_displayfunction |= LCD_5x10DOTS;
}
// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
// according to datasheet, we need at least 40ms after power rises above 2.7V
// before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
delay(50);
// Now we pull both RS and R/W low to begin commands
expanderWrite(_backlightval); // reset expanderand turn backlight off (Bit 8 =1)
delay(1000);
//put the LCD into 4 bit mode
// this is according to the hitachi HD44780 datasheet
// figure 24, pg 46
// we start in 8bit mode, try to set 4 bit mode
write4bits(0x03 << 4);
delayMicroseconds(4500); // wait min 4.1ms
// second try
write4bits(0x03 << 4);
delayMicroseconds(4500); // wait min 4.1ms
// third go!
write4bits(0x03 << 4);
delayMicroseconds(150);
// finally, set to 4-bit interface
write4bits(0x02 << 4);
// set # lines, font size, etc.
command(LCD_FUNCTIONSET | _displayfunction);
// turn the display on with no cursor or blinking default
_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
display();
// clear it off
clear();
// Initialize to default text direction (for roman languages)
_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
// set the entry mode
command(LCD_ENTRYMODESET | _displaymode);
home();
}
/********** high level commands, for the user! */
void HC_LiquidCrystal_I2C::clear(){
command(LCD_CLEARDISPLAY);// clear display, set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void HC_LiquidCrystal_I2C::home(){
command(LCD_RETURNHOME); // set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void HC_LiquidCrystal_I2C::setCursor(uint8_t col, uint8_t row){
int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
if (row > _rows) {
row = _rows-1; // we count rows starting w/0
}
command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
}
// Turn the display on/off (quickly)
void HC_LiquidCrystal_I2C::noDisplay() {
_displaycontrol &= ~LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void HC_LiquidCrystal_I2C::display() {
_displaycontrol |= LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turns the underline cursor on/off
void HC_LiquidCrystal_I2C::noCursor() {
_displaycontrol &= ~LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void HC_LiquidCrystal_I2C::cursor() {
_displaycontrol |= LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turn on and off the blinking cursor
void HC_LiquidCrystal_I2C::noBlink() {
_displaycontrol &= ~LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void HC_LiquidCrystal_I2C::blink() {
_displaycontrol |= LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// These commands scroll the display without changing the RAM
void HC_LiquidCrystal_I2C::scrollDisplayLeft(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
}
void HC_LiquidCrystal_I2C::scrollDisplayRight(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
}
// This is for text that flows Left to Right
void HC_LiquidCrystal_I2C::leftToRight(void) {
_displaymode |= LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This is for text that flows Right to Left
void HC_LiquidCrystal_I2C::rightToLeft(void) {
_displaymode &= ~LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'right justify' text from the cursor
void HC_LiquidCrystal_I2C::autoscroll(void) {
_displaymode |= LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'left justify' text from the cursor
void HC_LiquidCrystal_I2C::noAutoscroll(void) {
_displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// Allows us to fill the first 8 CGRAM locations
// with custom characters
void HC_LiquidCrystal_I2C::createChar(uint8_t location, uint8_t charmap[]) {
location &= 0x7; // we only have 8 locations 0-7
command(LCD_SETCGRAMADDR | (location << 3));
for (int i=0; i<8; i++) {
write(charmap[i]);
}
}
// Turn the (optional) backlight off/on
void HC_LiquidCrystal_I2C::noBacklight(void) {
_backlightval=LCD_NOBACKLIGHT;
expanderWrite(0);
}
void HC_LiquidCrystal_I2C::backlight(void) {
_backlightval=LCD_BACKLIGHT;
expanderWrite(0);
}
/*********** mid level commands, for sending data/cmds */
inline void HC_LiquidCrystal_I2C::command(uint8_t value) {
send(value, 0);
}
inline size_t HC_LiquidCrystal_I2C::write(uint8_t value) {
send(value, Rs);
return 1;
}
/************ low level data pushing commands **********/
// write either command or data
void HC_LiquidCrystal_I2C::send(uint8_t value, uint8_t mode) {
uint8_t highnib=value&0xf0;
uint8_t lownib=(value<<4)&0xf0;
write4bits((highnib)|mode);
write4bits((lownib)|mode);
}
void HC_LiquidCrystal_I2C::write4bits(uint8_t value) {
expanderWrite(value);
pulseEnable(value);
}
void HC_LiquidCrystal_I2C::expanderWrite(uint8_t _data){
Wire.beginTransmission(_addr);
Wire.write((int)(_data) | _backlightval);
Wire.endTransmission();
}
void HC_LiquidCrystal_I2C::pulseEnable(uint8_t _data){
expanderWrite(_data | En); // En high
delayMicroseconds(1); // enable pulse must be >450ns
expanderWrite(_data & ~En); // En low
delayMicroseconds(50); // commands need > 37us to settle
}
void HC_LiquidCrystal_I2C::load_custom_character(uint8_t char_num, uint8_t *rows){
createChar(char_num, rows);
}
void HC_LiquidCrystal_I2C::setBacklight(uint8_t new_val){
if (new_val) {
backlight(); // turn backlight on
} else {
noBacklight(); // turn backlight off
}
}
void HC_LiquidCrystal_I2C::printstr(const char c[]){
//This function is not identical to the function used for "real" I2C displays
//it's here so the user sketch doesn't have to be changed
print(c);
}

+ 164
- 0
EEITemperature/lib/HC_LiquidCrystal_I2C/HC_LiquidCrystal_I2C.h View File

@ -0,0 +1,164 @@
#ifndef FDB_LIQUID_CRYSTAL_I2C_H
#define FDB_LIQUID_CRYSTAL_I2C_H
#include <inttypes.h>
#include <Print.h>
// commands
#define LCD_CLEARDISPLAY 0x01
#define LCD_RETURNHOME 0x02
#define LCD_ENTRYMODESET 0x04
#define LCD_DISPLAYCONTROL 0x08
#define LCD_CURSORSHIFT 0x10
#define LCD_FUNCTIONSET 0x20
#define LCD_SETCGRAMADDR 0x40
#define LCD_SETDDRAMADDR 0x80
// flags for display entry mode
#define LCD_ENTRYRIGHT 0x00
#define LCD_ENTRYLEFT 0x02
#define LCD_ENTRYSHIFTINCREMENT 0x01
#define LCD_ENTRYSHIFTDECREMENT 0x00
// flags for display on/off control
#define LCD_DISPLAYON 0x04
#define LCD_DISPLAYOFF 0x00
#define LCD_CURSORON 0x02
#define LCD_CURSOROFF 0x00
#define LCD_BLINKON 0x01
#define LCD_BLINKOFF 0x00
// flags for display/cursor shift
#define LCD_DISPLAYMOVE 0x08
#define LCD_CURSORMOVE 0x00
#define LCD_MOVERIGHT 0x04
#define LCD_MOVELEFT 0x00
// flags for function set
#define LCD_8BITMODE 0x10
#define LCD_4BITMODE 0x00
#define LCD_2LINE 0x08
#define LCD_1LINE 0x00
#define LCD_5x10DOTS 0x04
#define LCD_5x8DOTS 0x00
// flags for backlight control
#define LCD_BACKLIGHT 0x08
#define LCD_NOBACKLIGHT 0x00
#define En B00000100 // Enable bit
#define Rw B00000010 // Read/Write bit
#define Rs B00000001 // Register select bit
/**
* This is the driver for the Liquid Crystal LCD displays that use the I2C bus.
*
* After creating an instance of this class, first call begin() before anything else.
* The backlight is on by default, since that is the most likely operating mode in
* most cases.
*/
class HC_LiquidCrystal_I2C : public Print {
public:
/**
* Constructor
*
* @param lcd_addr I2C slave address of the LCD display. Most likely printed on the
* LCD circuit board, or look in the supplied LCD documentation.
* @param lcd_cols Number of columns your LCD display has.
* @param lcd_rows Number of rows your LCD display has.
* @param charsize The size in dots that the display has, use LCD_5x10DOTS or LCD_5x8DOTS.
*/
HC_LiquidCrystal_I2C(uint8_t lcd_addr, uint8_t lcd_cols, uint8_t lcd_rows, uint8_t charsize = LCD_5x8DOTS);
/**
* Set the LCD display in the correct begin state, must be called before anything else is done.
*/
void begin();
/**
* Remove all the characters currently shown. Next print/write operation will start
* from the first position on LCD display.
*/
void clear();
/**
* Next print/write operation will will start from the first position on the LCD display.
*/
void home();
/**
* Do not show any characters on the LCD display. Backlight state will remain unchanged.
* Also all characters written on the display will return, when the display in enabled again.
*/
void noDisplay();
/**
* Show the characters on the LCD display, this is the normal behaviour. This method should
* only be used after noDisplay() has been used.
*/
void display();
/**
* Do not blink the cursor indicator.
*/
void noBlink();
/**
* Start blinking the cursor indicator.
*/
void blink();
/**
* Do not show a cursor indicator.
*/
void noCursor();
/**
* Show a cursor indicator, cursor can blink on not blink. Use the
* methods blink() and noBlink() for changing cursor blink.
*/
void cursor();
void scrollDisplayLeft();
void scrollDisplayRight();
void printLeft();
void printRight();
void leftToRight();
void rightToLeft();
void shiftIncrement();
void shiftDecrement();
void noBacklight();
void backlight();
void autoscroll();
void noAutoscroll();
void createChar(uint8_t, uint8_t[]);
void setCursor(uint8_t, uint8_t);
virtual size_t write(uint8_t);
void command(uint8_t);
inline void blink_on() { blink(); }
inline void blink_off() { noBlink(); }
inline void cursor_on() { cursor(); }
inline void cursor_off() { noCursor(); }
// Compatibility API function aliases
void setBacklight(uint8_t new_val); // alias for backlight() and nobacklight()
void load_custom_character(uint8_t char_num, uint8_t *rows); // alias for createChar()
void printstr(const char[]);
private:
void send(uint8_t, uint8_t);
void write4bits(uint8_t);
void expanderWrite(uint8_t);
void pulseEnable(uint8_t);
uint8_t _addr;
uint8_t _displayfunction;
uint8_t _displaycontrol;
uint8_t _displaymode;
uint8_t _cols;
uint8_t _rows;
uint8_t _charsize;
uint8_t _backlightval;
};
#endif // FDB_LIQUID_CRYSTAL_I2C_H

+ 1
- 0
EEITemperature/lib/esp8266-dht22

@ -0,0 +1 @@
Subproject commit b949ac35a553e4089f3e81dc7e4d739a02a00f78

+ 44
- 44
Examples/LCDTest/LCDTest.ino View File

@ -55,53 +55,53 @@ HC_LiquidCrystal_I2C lcd(0x3F,20,4);
void setup()
{
/* Initialise the LCD */
lcd.begin();
/* Transfer the custom characters into the LCD's memory */
lcd.createChar(0, TopLeftCorner);
lcd.createChar(1, TopRightCorner);
lcd.createChar(2, BottomLeftCorner);
lcd.createChar(3, BottomRightCorner);
lcd.createChar(4, VerticalBar);
// Wire.pins(12, 14);
/* Initialise the LCD */
lcd.begin();
/* Transfer the custom characters into the LCD's memory */
lcd.createChar(0, TopLeftCorner);
lcd.createChar(1, TopRightCorner);
lcd.createChar(2, BottomLeftCorner);
lcd.createChar(3, BottomRightCorner);
lcd.createChar(4, VerticalBar);
}
/* Main program loop */
void loop()
{
/* Make sure the backlight is turned on */
lcd.backlight();
/* Use the custom graphic characters to draw a border */
lcd.setCursor(0, 0);
lcd.write(0); //Write the top left graphic
lcd.print("==================");
lcd.write(1); //Write the top right graphic
lcd.setCursor(0, 1);
lcd.write(4); //Write the vertical bar graphic
lcd.setCursor(0, 2);
lcd.write(4); //Write the vertical bar graphic
lcd.setCursor(19, 1);
lcd.write(4); //Write the vertical bar graphic
lcd.setCursor(19, 2);
lcd.write(4); //Write the vertical bar graphic
lcd.setCursor(0, 3);
lcd.write(2); //Write the bottom left graphic
lcd.print("==================");
lcd.write(3); //Write the bottom right graphic
/* Display some text inside the border */
while (1)
{
lcd.setCursor(2,1);
lcd.print("HOBBY COMPONENTS");
lcd.setCursor(2,2);
lcd.print("**HELLO WORLD**");
delay(500);
lcd.setCursor(2,1);
lcd.print(" ");
lcd.setCursor(2,2);
lcd.print(" ");
delay(500);
}
/* Make sure the backlight is turned on */
lcd.backlight();
/* Use the custom graphic characters to draw a border */
lcd.setCursor(0, 0);
lcd.write(0); //Write the top left graphic
lcd.print("==================");
lcd.write(1); //Write the top right graphic
lcd.setCursor(0, 1);
lcd.write(4); //Write the vertical bar graphic
lcd.setCursor(0, 2);
lcd.write(4); //Write the vertical bar graphic
lcd.setCursor(19, 1);
lcd.write(4); //Write the vertical bar graphic
lcd.setCursor(19, 2);
lcd.write(4); //Write the vertical bar graphic
lcd.setCursor(0, 3);
lcd.write(2); //Write the bottom left graphic
lcd.print("==================");
lcd.write(3); //Write the bottom right graphic
/* Display some text inside the border */
while (1)
{
lcd.setCursor(2,1);
lcd.print("HOBBY COMPONENTS");
lcd.setCursor(2,2);
lcd.print("**HELLO WORLD**");
delay(500);
lcd.setCursor(2,1);
lcd.print(" ");
lcd.setCursor(2,2);
lcd.print(" ");
delay(500);
}
}

Loading…
Cancel
Save