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| #include <LiquidCrystal.h> | |
| // Transmit rate in bps | |
| #define TX_RATE 5 | |
| // Pin assignments | |
| #define TX_CLOCK 2 | |
| #define TX_DATA 3 | |
| #define LCD_D4 4 | |
| #define LCD_D5 5 | |
| #define LCD_D6 6 | |
| #define LCD_D7 7 | |
| #define LCD_RS 8 | |
| #define LCD_EN 9 | |
| const char *message = "Hello, world!"; | |
| void setup() { | |
| pinMode(TX_CLOCK, OUTPUT); | |
| pinMode(TX_DATA, OUTPUT); | |
| // Initialize the LCD screen | |
| LiquidCrystal lcd(LCD_RS, LCD_EN, LCD_D4, LCD_D5, LCD_D6, LCD_D7); | |
| lcd.begin(16, 2); | |
| lcd.setCursor(0, 0); | |
| lcd.print(message); | |
| for (int byte_idx = 0; byte_idx < strlen(message); byte_idx++) { | |
| char tx_byte = message[byte_idx]; | |
| // Clear the second line of the display | |
| lcd.noCursor(); | |
| lcd.setCursor(0, 1); | |
| lcd.print(" "); | |
| lcd.setCursor(byte_idx, 0); | |
| lcd.cursor(); | |
| for (int bit_idx = 0; bit_idx < 8; bit_idx++) { | |
| bool tx_bit = tx_byte & (0x80 >> bit_idx); | |
| digitalWrite(TX_DATA, tx_bit); | |
| delay((1000 / TX_RATE) / 2); | |
| // Update the LCD | |
| lcd.noCursor(); | |
| lcd.setCursor(bit_idx, 1); | |
| lcd.print(tx_bit ? "1" : "0"); | |
| lcd.setCursor(byte_idx, 0); | |
| lcd.cursor(); | |
| // Pulse clock | |
| digitalWrite(TX_CLOCK, HIGH); | |
| delay((1000 / TX_RATE) / 2); | |
| digitalWrite(TX_CLOCK, LOW); | |
| } | |
| } | |
| digitalWrite(TX_DATA, LOW); | |
| } | |
| void loop() { | |
| // put your main code here, to run repeatedly: | |
| } |