Add LCD1602 I2C demo for UNO R4 WiFi
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@ -88,6 +88,8 @@ dokumentation, forbindelser og biblioteker beskrives ved den enkelte sketch.
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– fast løbetekst på matrixen
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- [`wifi_matrix_message_board`](sketches/arduino-uno-r4-wifi/wifi_matrix_message_board)
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– browserstyret løbetekst via Wi-Fi
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- [`lcd1602_i2c_demo`](sketches/arduino-uno-r4-wifi/lcd1602_i2c_demo) – effekt-demo
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til et eksternt 16×2 HD44780-display med PCF8574 I²C-backpack
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### Arduino UNO R4 Minima
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@ -51,6 +51,7 @@ kapacitiv touch-hardware, men ingen færdige touchflader på selve boardet.
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- [`led_matrix_demo`](../../sketches/arduino-uno-r4-wifi/led_matrix_demo)
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- [`led_matrix_scrolling_text`](../../sketches/arduino-uno-r4-wifi/led_matrix_scrolling_text)
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- [`wifi_matrix_message_board`](../../sketches/arduino-uno-r4-wifi/wifi_matrix_message_board)
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- [`lcd1602_i2c_demo`](../../sketches/arduino-uno-r4-wifi/lcd1602_i2c_demo)
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## Kilder
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37
sketches/arduino-uno-r4-wifi/lcd1602_i2c_demo/README.md
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37
sketches/arduino-uno-r4-wifi/lcd1602_i2c_demo/README.md
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@ -0,0 +1,37 @@
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# LCD1602 I²C-demo
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En effekt-demo til et HD44780-kompatibelt 16×2-tegndisplay med den almindelige
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PCF8574/PCF8574A I²C-backpack. Demoen viser:
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- animeret opstart og blink med baggrundsbelysningen;
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- brugerdefinerede hjerte-, smiley- og rakettegn;
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- vandret løbetekst;
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- en animeret 16-kanals "BYTE BEATS"-equalizer;
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- oppetid og spinner.
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Sketchen bruger kun `Wire`, som følger med Arduino-kernen. Den scanner selv
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PCF8574-adresseområderne `0x20`–`0x27` og `0x38`–`0x3F`, så den typiske adresse
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`0x27` behøver ikke angives manuelt.
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## Tilslutning
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| LCD-backpack | Arduino UNO R4 WiFi |
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| --- | --- |
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| GND | GND |
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| VCC | 5V |
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| SDA | SDA |
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| SCL | SCL |
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Brug de mærkede SDA/SCL-ben ved AREF (eller de tilsvarende A4/A5-signaler).
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Hvis baggrundsbelysningen tænder, men tegnene ikke ses, justeres det blå
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kontrast-potentiometer forsigtigt med en lille skruetrækker.
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## Byg og upload
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```powershell
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arduino-cli compile --fqbn arduino:renesas_uno:unor4wifi sketches/arduino-uno-r4-wifi/lcd1602_i2c_demo
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arduino-cli upload -p COM5 --fqbn arduino:renesas_uno:unor4wifi sketches/arduino-uno-r4-wifi/lcd1602_i2c_demo
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```
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Serial Monitor kan åbnes ved 115200 baud for at se den fundne I²C-adresse eller
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en fejlmeddelelse, hvis displayet ikke findes.
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@ -0,0 +1,245 @@
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#include <Wire.h>
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// HD44780 16x2 display with the common PCF8574 I2C backpack mapping:
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// P0=RS, P1=RW, P2=Enable, P3=backlight, P4..P7=D4..D7.
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constexpr uint8_t LCD_COLUMNS = 16;
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constexpr uint8_t LCD_ROWS = 2;
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constexpr uint8_t PIN_RS = 0x01;
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constexpr uint8_t PIN_ENABLE = 0x04;
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constexpr uint8_t PIN_BACKLIGHT = 0x08;
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uint8_t lcdAddress = 0;
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uint8_t backlightState = PIN_BACKLIGHT;
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const byte heart[8] = {
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B00000, B01010, B11111, B11111, B01110, B00100, B00000, B00000
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};
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const byte smile[8] = {
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B00000, B01010, B00000, B00000, B10001, B01110, B00000, B00000
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};
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const byte rocket[8] = {
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B00100, B01110, B01110, B11111, B10101, B00100, B01010, B10001
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};
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const byte spinner[4][8] = {
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{B00100, B00100, B00100, B00100, B00100, B00100, B00100, B00000},
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{B00000, B00000, B00001, B00010, B00100, B01000, B10000, B00000},
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{B00000, B00000, B00000, B11111, B00000, B00000, B00000, B00000},
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{B00000, B00000, B10000, B01000, B00100, B00010, B00001, B00000}
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};
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void expanderWrite(uint8_t value) {
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Wire.beginTransmission(lcdAddress);
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Wire.write(value | backlightState);
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Wire.endTransmission();
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}
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void pulseEnable(uint8_t value) {
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expanderWrite(value | PIN_ENABLE);
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delayMicroseconds(1);
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expanderWrite(value & ~PIN_ENABLE);
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delayMicroseconds(50);
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}
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void writeNibble(uint8_t nibble, bool dataMode) {
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uint8_t value = (nibble & 0x0F) << 4;
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if (dataMode) value |= PIN_RS;
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expanderWrite(value);
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pulseEnable(value);
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}
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void lcdSend(uint8_t value, bool dataMode) {
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writeNibble(value >> 4, dataMode);
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writeNibble(value, dataMode);
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}
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void lcdCommand(uint8_t command) {
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lcdSend(command, false);
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if (command == 0x01 || command == 0x02) delayMicroseconds(2000);
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}
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void lcdWrite(uint8_t value) {
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lcdSend(value, true);
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}
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void lcdPrint(const char *text) {
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while (*text) lcdWrite(*text++);
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}
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void lcdClear() {
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lcdCommand(0x01);
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}
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void lcdSetCursor(uint8_t column, uint8_t row) {
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static const uint8_t rowOffset[] = {0x00, 0x40};
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lcdCommand(0x80 | (column + rowOffset[row % LCD_ROWS]));
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}
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void lcdCreateChar(uint8_t slot, const byte bitmap[8]) {
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lcdCommand(0x40 | ((slot & 0x07) << 3));
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for (uint8_t row = 0; row < 8; ++row) lcdWrite(bitmap[row]);
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}
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void lcdInit() {
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delay(50);
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writeNibble(0x03, false);
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delayMicroseconds(4500);
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writeNibble(0x03, false);
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delayMicroseconds(4500);
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writeNibble(0x03, false);
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delayMicroseconds(150);
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writeNibble(0x02, false);
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lcdCommand(0x28); // 4-bit, two lines, 5x8 font
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lcdCommand(0x08); // Display off
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lcdClear();
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lcdCommand(0x06); // Cursor moves right
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lcdCommand(0x0C); // Display on, cursor off
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}
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uint8_t findDisplay() {
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// PCF8574 and PCF8574A address ranges.
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const uint8_t ranges[][2] = {{0x20, 0x27}, {0x38, 0x3F}};
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for (const auto &range : ranges) {
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for (uint8_t address = range[0]; address <= range[1]; ++address) {
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Wire.beginTransmission(address);
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if (Wire.endTransmission() == 0) return address;
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}
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}
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return 0;
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}
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void printPadded(const char *text, uint8_t width = LCD_COLUMNS) {
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uint8_t count = 0;
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while (*text && count < width) {
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lcdWrite(*text++);
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++count;
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}
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while (count++ < width) lcdWrite(' ');
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}
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void bootSequence() {
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lcdClear();
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lcdSetCursor(0, 0);
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lcdWrite(2);
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lcdPrint(" R4 WiFi LAB ");
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lcdWrite(2);
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lcdSetCursor(0, 1);
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for (uint8_t i = 0; i < LCD_COLUMNS; ++i) {
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lcdWrite(0xFF);
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delay(75);
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}
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delay(350);
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for (uint8_t flash = 0; flash < 2; ++flash) {
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backlightState = 0;
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expanderWrite(0);
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delay(90);
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backlightState = PIN_BACKLIGHT;
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expanderWrite(0);
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delay(120);
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}
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}
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void marqueeDemo() {
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const char message[] = " Arduino UNO R4 WiFi + LCD1602 = AWESOME! ";
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const int length = sizeof(message) - 1;
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lcdClear();
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lcdSetCursor(0, 0);
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lcdWrite(0);
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lcdPrint(" MAKER MODE ");
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lcdWrite(0);
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for (int offset = 0; offset <= length - LCD_COLUMNS; ++offset) {
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lcdSetCursor(0, 1);
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for (uint8_t column = 0; column < LCD_COLUMNS; ++column) {
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lcdWrite(message[offset + column]);
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}
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delay(145);
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}
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}
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void equalizerDemo() {
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for (uint8_t level = 0; level < 8; ++level) {
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byte bar[8];
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for (uint8_t row = 0; row < 8; ++row) {
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bar[row] = row >= (7 - level) ? B11111 : B00000;
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}
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lcdCreateChar(level, bar);
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}
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lcdClear();
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lcdSetCursor(0, 0);
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printPadded(" BYTE BEATS");
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for (uint8_t frame = 0; frame < 38; ++frame) {
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lcdSetCursor(0, 1);
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for (uint8_t column = 0; column < LCD_COLUMNS; ++column) {
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// A deterministic animated wave: no random seed needed.
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uint8_t level = (column * 3 + frame * 2 + (column ^ frame)) % 8;
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lcdWrite(level);
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}
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delay(95);
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}
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// Restore the icons overwritten by the equalizer characters.
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lcdCreateChar(0, heart);
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lcdCreateChar(1, smile);
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lcdCreateChar(2, rocket);
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}
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void uptimeDemo() {
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lcdClear();
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lcdSetCursor(0, 0);
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lcdPrint("SYSTEM ONLINE ");
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lcdWrite(1);
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for (uint8_t frame = 0; frame < 32; ++frame) {
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lcdCreateChar(3, spinner[frame % 4]);
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unsigned long seconds = millis() / 1000;
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char line[17];
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snprintf(line, sizeof(line), "UP %5lus ", seconds);
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lcdSetCursor(0, 1);
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lcdWrite(3);
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lcdWrite(' ');
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printPadded(line, 14);
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delay(125);
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}
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}
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void setup() {
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Serial.begin(115200);
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Wire.begin();
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Wire.setClock(100000);
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lcdAddress = findDisplay();
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if (lcdAddress == 0) {
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Serial.println("LCD1602-demo: intet PCF8574 I2C-display fundet.");
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Serial.println("Kontroller GND, 5V, SDA og SCL, og genstart boardet.");
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return;
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}
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Serial.print("LCD1602 fundet paa I2C-adresse 0x");
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Serial.println(lcdAddress, HEX);
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lcdInit();
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lcdCreateChar(0, heart);
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lcdCreateChar(1, smile);
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lcdCreateChar(2, rocket);
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bootSequence();
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}
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void loop() {
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if (lcdAddress == 0) {
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delay(1000);
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return;
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}
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marqueeDemo();
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equalizerDemo();
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uptimeDemo();
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}
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