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→Programming
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int lcdRows = 2; | int lcdRows = 2; | ||
// set LCD address, number of columns and rows | // set LCD address, number of columns and rows | ||
// if | // if don't know the display address, run an I2C scanner sketch | ||
LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows); | LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows); | ||
// set up display texts | // set up display texts | ||
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// A string variable used to store accumulated ASCII conversations | // A string variable used to store accumulated ASCII conversations | ||
String dialogue = ""; | String dialogue = ""; | ||
// for counting | // for counting characters from ASCII codes | ||
int charCount = 0; | int charCount = 0; | ||
/* Function: Scrolling Texts */ | /* Function: Scrolling Texts */ | ||
// The function | // The function accepts the following arguments: | ||
// row: row number where the text will be displayed | // row: row number where the text will be displayed | ||
// message: message to scroll | // message: message to scroll | ||
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ThingSpeak.writeField(ChannelNumber2, 1, mq2g3V, WriteAPIkey2); | ThingSpeak.writeField(ChannelNumber2, 1, mq2g3V, WriteAPIkey2); | ||
// LCD | // LCD messages | ||
// convert MQ-2's value to ASCII code | // convert MQ-2's value to ASCII code | ||
int ascii_value = map(mq2g3V, 1000, 2500, 34, 126); | int ascii_value = map(mq2g3V, 1000, 2500, 34, 126); | ||
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// a new character is added to the string (the previous one is kept) | // a new character is added to the string (the previous one is kept) | ||
dialogue += ascii_char ; | dialogue += ascii_char ; | ||
charCount++; // | charCount++; // accumulated character count +1 | ||
// Try using spaces to create a variation in sentence length for a more natural dialogue effect. | // Try using spaces to create a variation in sentence length for a more natural dialogue effect. | ||
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} | } | ||
} | } | ||
// if the string length exceeds the LCD | // if the string length exceeds the LCD limit (32 characters) | ||
if (dialogue.length() > 32) { | if (dialogue.length() > 32) { | ||
dialogue = dialogue.substring(1); // remove the oldest character | dialogue = dialogue.substring(1); // remove the oldest character | ||
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yield(); // buffer ESP - stuff | yield(); // buffer ESP - stuff | ||
// LCD | // show LCD | ||
lcd.clear(); | lcd.clear(); | ||
// set cursor to position (column and row) | // set cursor to position (column and row) | ||